Microwave thermolysis with clayfen: Solvent-free oxidation of sulfides to sulfoxides

Synthetic Communications

Volumn 28, Issue 21, 1998, Pages 4087-4095

  Varma, Rajender S ^a   Dahiya, Rajender ^a  

^a SAM HOUSTON STATE UNIVERSITY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

DICHLOROMETHANE; IRON DERIVATIVE; SOLVENT; SULFIDE; SULFOXIDE;

CLAY; MICROWAVE IRRADIATION; OXIDATION; REACTION ANALYSIS; REVIEW;

EID: 0031656230     PISSN: 00397911     EISSN: None     Source Type: Journal    
DOI: 10.1080/00397919808004969     Document Type: Review

References (66)

1. (a) Posner, G.H. Angew. Chem. Int. Ed. Engl. 1978, 17, 487.
2. (b) McKillop, A. and Young, D.W. Synthesis 1979, 401; 481.
3. (c) Laszlo, P. "Preparative Chemistry using Supported Reagents," Academic Press, San Diego, California, 1987.
4. (d) Kabalka, G.W.; Wadgaonkar, P.P. and Chatla, N. Synth. Commun. 1990, 20, 293.
5. (e) Balogh, M. and Laszlo, P. "Organic Chemistry Using Clays," Springer-Verlag, Berlin, 1993.
6. (f) Clark, J.H. "Catalysis of Organic Reactions by Supported Inorganic Reagents," VCH publisher, Inc., NY, 1994.
7. Gedye, R.; Smith, F.; Westaway, K.; Ali, H.; Baldisera, L.; Laberge, L. and Rousell, J. Tetrahedron Lett. 1986, 27, 279.
8. For recent reviews on microwave assisted chemical reactions see: (a) Abramovich, R.A. Org. Prep. Proced. Int. 1991, 23, 683. (b) Whittaker, A.G. and Mingos, D.M.P. J. Microwave Power Electromagn. Energy 1994, 29, 195. (c) Majetich, G. and Hicks, R. J. Microwave Power Electromagn. Energy 1995, 30, 27. (d) Caddick, S. Tetrahedron 1995, 51, 10403. (e) Varma, R.S. "Microwave-Assisted Reactions under Solvent-Free 'Dry' Conditions" in Microwaves: Theory and Application in Material Processing IV, Clark, D.E.; Sutton, W.H. and Lewis, D.A., Eds., American Ceramic Society, Ceramic Transactions 1997, 80, pp 375-365.
9. For recent reviews on microwave assisted chemical reactions see: (a) Abramovich, R.A. Org. Prep. Proced. Int. 1991, 23, 683. (b) Whittaker, A.G. and Mingos, D.M.P. J. Microwave Power Electromagn. Energy 1994, 29, 195. (c) Majetich, G. and Hicks, R. J. Microwave Power Electromagn. Energy 1995, 30, 27. (d) Caddick, S. Tetrahedron 1995, 51, 10403. (e) Varma, R.S. "Microwave-Assisted Reactions under Solvent-Free 'Dry' Conditions" in Microwaves: Theory and Application in Material Processing IV, Clark, D.E.; Sutton, W.H. and Lewis, D.A., Eds., American Ceramic Society, Ceramic Transactions 1997, 80, pp 375-365.
10. For recent reviews on microwave assisted chemical reactions see: (a) Abramovich, R.A. Org. Prep. Proced. Int. 1991, 23, 683. (b) Whittaker, A.G. and Mingos, D.M.P. J. Microwave Power Electromagn. Energy 1994, 29, 195. (c) Majetich, G. and Hicks, R. J. Microwave Power Electromagn. Energy 1995, 30, 27. (d) Caddick, S. Tetrahedron 1995, 51, 10403. (e) Varma, R.S. "Microwave-Assisted Reactions under Solvent-Free 'Dry' Conditions" in Microwaves: Theory and Application in Material Processing IV, Clark, D.E.; Sutton, W.H. and Lewis, D.A., Eds., American Ceramic Society, Ceramic Transactions 1997, 80, pp 375-365.
11. For recent reviews on microwave assisted chemical reactions see: (a) Abramovich, R.A. Org. Prep. Proced. Int. 1991, 23, 683. (b) Whittaker, A.G. and Mingos, D.M.P. J. Microwave Power Electromagn. Energy 1994, 29, 195. (c) Majetich, G. and Hicks, R. J. Microwave Power Electromagn. Energy 1995, 30, 27. (d) Caddick, S. Tetrahedron 1995, 51, 10403. (e) Varma, R.S. "Microwave-Assisted Reactions under Solvent-Free 'Dry' Conditions" in Microwaves: Theory and Application in Material Processing IV, Clark, D.E.; Sutton, W.H. and Lewis, D.A., Eds., American Ceramic Society, Ceramic Transactions 1997, 80, pp 375-365.
12. For recent reviews on microwave assisted chemical reactions see: (a) Abramovich, R.A. Org. Prep. Proced. Int. 1991, 23, 683. (b) Whittaker, A.G. and Mingos, D.M.P. J. Microwave Power Electromagn. Energy 1994, 29, 195. (c) Majetich, G. and Hicks, R. J. Microwave Power Electromagn. Energy 1995, 30, 27. (d) Caddick, S. Tetrahedron 1995, 51, 10403. (e) Varma, R.S. "Microwave-Assisted Reactions under Solvent-Free 'Dry' Conditions" in Microwaves: Theory and Application in Material Processing IV, Clark, D.E.; Sutton, W.H. and Lewis, D.A., Eds., American Ceramic Society, Ceramic Transactions 1997, 80, pp 375-365.
13. (a) Giguere, R.J.; Namen, A.M.; Lopez, B.O.; Arepally, A.; Ramos, D.E.; Majetich, G. and Defrauw, J. Tetrahedron Lett. 1987, 28, 6553.
14. (b) Bose, A.K.; Banik, B.K.; Lavlinskaia, N.; Jayaraman, M. and Manhas, M.S. Chemtech 1997, 27, 18.
15. (a) Oussaid, A.; Thach, L.N. and Loupy, A. Tetrahedron Lett. 1997, 38, 2451.
16. (b) Villemin, D. and Benalloum, A. Synth. Commun. 1991, 21, 1; 63.
17. (c) Lerestif, J.M.; Toupet, L.; Sinbandhit, S.; Tonnard, F.; Bazureau, J.P. and Hamelin, J. Tetrahedron 1997, 53, 6351.
18. For cleavage-deprotection reactions see: (a) Varma, R.S.; Chatterjee, A.K. and Varma, M. Tetrahedron Lett. 1993, 34, 3207. (b) Varma, R.S.; Chatterjee, A.K. and Varma, M. Tetrahedron Lett. 1993, 34, 4603. (c) Varma, R.S.; Varma, M. and Chatterjee, A.K. J. Chem. Soc., Perkin. Trans. 1 1993, 999. (d) Varma, R.S.; Lamture, J.B. and Varma, M. Tetrahedron Lett. 1993, 34, 3029. (e) Varma, R.S. and Saini, R.K. Tetrahedron Lett. 1997, 38, 2623. (f) Varma, R.S. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 5427. (g) Varma, R.S. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 7973. (h) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 8819. For condensation-cyclization reactions see: (i) Varma, R.S.; Dahiya, R. and Kumar, S. Tetrahedron Lett. 1997, 38, 2039. (j) Varma, R.S. and Dahiya, R. Synlett 1997, 1245. (k) Varma, R.S.; Dahiya, R. and Kumar, S. Tetrahedron Lett. 1997, 38, 5131. (l) Varma, R.S. and Saini, R.K. Synlett 1997, 857. For oxidation reactions see: (m) Varma, R.S. and Dahiya, R. Tetrahedron Lett. 1997, 38, 2043. (n) Varma, R.S.; Saini, R.K. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 6525. (o) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 7029. (p) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 7823. For reduction reactions see: (q) Varma, R.S. and Saini, R.K. Tetrahedron Lett. 1997, 38, 4337.
19. For cleavage-deprotection reactions see: (a) Varma, R.S.; Chatterjee, A.K. and Varma, M. Tetrahedron Lett. 1993, 34, 3207. (b) Varma, R.S.; Chatterjee, A.K. and Varma, M. Tetrahedron Lett. 1993, 34, 4603. (c) Varma, R.S.; Varma, M. and Chatterjee, A.K. J. Chem. Soc., Perkin. Trans. 1 1993, 999. (d) Varma, R.S.; Lamture, J.B. and Varma, M. Tetrahedron Lett. 1993, 34, 3029. (e) Varma, R.S. and Saini, R.K. Tetrahedron Lett. 1997, 38, 2623. (f) Varma, R.S. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 5427. (g) Varma, R.S. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 7973. (h) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 8819. For condensation-cyclization reactions see: (i) Varma, R.S.; Dahiya, R. and Kumar, S. Tetrahedron Lett. 1997, 38, 2039. (j) Varma, R.S. and Dahiya, R. Synlett 1997, 1245. (k) Varma, R.S.; Dahiya, R. and Kumar, S. Tetrahedron Lett. 1997, 38, 5131. (l) Varma, R.S. and Saini, R.K. Synlett 1997, 857. For oxidation reactions see: (m) Varma, R.S. and Dahiya, R. Tetrahedron Lett. 1997, 38, 2043. (n) Varma, R.S.; Saini, R.K. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 6525. (o) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 7029. (p) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 7823. For reduction reactions see: (q) Varma, R.S. and Saini, R.K. Tetrahedron Lett. 1997, 38, 4337.
20. For cleavage-deprotection reactions see: (a) Varma, R.S.; Chatterjee, A.K. and Varma, M. Tetrahedron Lett. 1993, 34, 3207. (b) Varma, R.S.; Chatterjee, A.K. and Varma, M. Tetrahedron Lett. 1993, 34, 4603. (c) Varma, R.S.; Varma, M. and Chatterjee, A.K. J. Chem. Soc., Perkin. Trans. 1 1993, 999. (d) Varma, R.S.; Lamture, J.B. and Varma, M. Tetrahedron Lett. 1993, 34, 3029. (e) Varma, R.S. and Saini, R.K. Tetrahedron Lett. 1997, 38, 2623. (f) Varma, R.S. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 5427. (g) Varma, R.S. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 7973. (h) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 8819. For condensation-cyclization reactions see: (i) Varma, R.S.; Dahiya, R. and Kumar, S. Tetrahedron Lett. 1997, 38, 2039. (j) Varma, R.S. and Dahiya, R. Synlett 1997, 1245. (k) Varma, R.S.; Dahiya, R. and Kumar, S. Tetrahedron Lett. 1997, 38, 5131. (l) Varma, R.S. and Saini, R.K. Synlett 1997, 857. For oxidation reactions see: (m) Varma, R.S. and Dahiya, R. Tetrahedron Lett. 1997, 38, 2043. (n) Varma, R.S.; Saini, R.K. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 6525. (o) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 7029. (p) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 7823. For reduction reactions see: (q) Varma, R.S. and Saini, R.K. Tetrahedron Lett. 1997, 38, 4337.
21. For cleavage-deprotection reactions see: (a) Varma, R.S.; Chatterjee, A.K. and Varma, M. Tetrahedron Lett. 1993, 34, 3207. (b) Varma, R.S.; Chatterjee, A.K. and Varma, M. Tetrahedron Lett. 1993, 34, 4603. (c) Varma, R.S.; Varma, M. and Chatterjee, A.K. J. Chem. Soc., Perkin. Trans. 1 1993, 999. (d) Varma, R.S.; Lamture, J.B. and Varma, M. Tetrahedron Lett. 1993, 34, 3029. (e) Varma, R.S. and Saini, R.K. Tetrahedron Lett. 1997, 38, 2623. (f) Varma, R.S. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 5427. (g) Varma, R.S. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 7973. (h) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 8819. For condensation-cyclization reactions see: (i) Varma, R.S.; Dahiya, R. and Kumar, S. Tetrahedron Lett. 1997, 38, 2039. (j) Varma, R.S. and Dahiya, R. Synlett 1997, 1245. (k) Varma, R.S.; Dahiya, R. and Kumar, S. Tetrahedron Lett. 1997, 38, 5131. (l) Varma, R.S. and Saini, R.K. Synlett 1997, 857. For oxidation reactions see: (m) Varma, R.S. and Dahiya, R. Tetrahedron Lett. 1997, 38, 2043. (n) Varma, R.S.; Saini, R.K. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 6525. (o) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 7029. (p) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 7823. For reduction reactions see: (q) Varma, R.S. and Saini, R.K. Tetrahedron Lett. 1997, 38, 4337.
22. For cleavage-deprotection reactions see: (a) Varma, R.S.; Chatterjee, A.K. and Varma, M. Tetrahedron Lett. 1993, 34, 3207. (b) Varma, R.S.; Chatterjee, A.K. and Varma, M. Tetrahedron Lett. 1993, 34, 4603. (c) Varma, R.S.; Varma, M. and Chatterjee, A.K. J. Chem. Soc., Perkin. Trans. 1 1993, 999. (d) Varma, R.S.; Lamture, J.B. and Varma, M. Tetrahedron Lett. 1993, 34, 3029. (e) Varma, R.S. and Saini, R.K. Tetrahedron Lett. 1997, 38, 2623. (f) Varma, R.S. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 5427. (g) Varma, R.S. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 7973. (h) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 8819. For condensation-cyclization reactions see: (i) Varma, R.S.; Dahiya, R. and Kumar, S. Tetrahedron Lett. 1997, 38, 2039. (j) Varma, R.S. and Dahiya, R. Synlett 1997, 1245. (k) Varma, R.S.; Dahiya, R. and Kumar, S. Tetrahedron Lett. 1997, 38, 5131. (l) Varma, R.S. and Saini, R.K. Synlett 1997, 857. For oxidation reactions see: (m) Varma, R.S. and Dahiya, R. Tetrahedron Lett. 1997, 38, 2043. (n) Varma, R.S.; Saini, R.K. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 6525. (o) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 7029. (p) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 7823. For reduction reactions see: (q) Varma, R.S. and Saini, R.K. Tetrahedron Lett. 1997, 38, 4337.
23. For cleavage-deprotection reactions see: (a) Varma, R.S.; Chatterjee, A.K. and Varma, M. Tetrahedron Lett. 1993, 34, 3207. (b) Varma, R.S.; Chatterjee, A.K. and Varma, M. Tetrahedron Lett. 1993, 34, 4603. (c) Varma, R.S.; Varma, M. and Chatterjee, A.K. J. Chem. Soc., Perkin. Trans. 1 1993, 999. (d) Varma, R.S.; Lamture, J.B. and Varma, M. Tetrahedron Lett. 1993, 34, 3029. (e) Varma, R.S. and Saini, R.K. Tetrahedron Lett. 1997, 38, 2623. (f) Varma, R.S. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 5427. (g) Varma, R.S. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 7973. (h) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 8819. For condensation-cyclization reactions see: (i) Varma, R.S.; Dahiya, R. and Kumar, S. Tetrahedron Lett. 1997, 38, 2039. (j) Varma, R.S. and Dahiya, R. Synlett 1997, 1245. (k) Varma, R.S.; Dahiya, R. and Kumar, S. Tetrahedron Lett. 1997, 38, 5131. (l) Varma, R.S. and Saini, R.K. Synlett 1997, 857. For oxidation reactions see: (m) Varma, R.S. and Dahiya, R. Tetrahedron Lett. 1997, 38, 2043. (n) Varma, R.S.; Saini, R.K. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 6525. (o) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 7029. (p) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 7823. For reduction reactions see: (q) Varma, R.S. and Saini, R.K. Tetrahedron Lett. 1997, 38, 4337.
24. For cleavage-deprotection reactions see: (a) Varma, R.S.; Chatterjee, A.K. and Varma, M. Tetrahedron Lett. 1993, 34, 3207. (b) Varma, R.S.; Chatterjee, A.K. and Varma, M. Tetrahedron Lett. 1993, 34, 4603. (c) Varma, R.S.; Varma, M. and Chatterjee, A.K. J. Chem. Soc., Perkin. Trans. 1 1993, 999. (d) Varma, R.S.; Lamture, J.B. and Varma, M. Tetrahedron Lett. 1993, 34, 3029. (e) Varma, R.S. and Saini, R.K. Tetrahedron Lett. 1997, 38, 2623. (f) Varma, R.S. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 5427. (g) Varma, R.S. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 7973. (h) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 8819. For condensation-cyclization reactions see: (i) Varma, R.S.; Dahiya, R. and Kumar, S. Tetrahedron Lett. 1997, 38, 2039. (j) Varma, R.S. and Dahiya, R. Synlett 1997, 1245. (k) Varma, R.S.; Dahiya, R. and Kumar, S. Tetrahedron Lett. 1997, 38, 5131. (l) Varma, R.S. and Saini, R.K. Synlett 1997, 857. For oxidation reactions see: (m) Varma, R.S. and Dahiya, R. Tetrahedron Lett. 1997, 38, 2043. (n) Varma, R.S.; Saini, R.K. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 6525. (o) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 7029. (p) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 7823. For reduction reactions see: (q) Varma, R.S. and Saini, R.K. Tetrahedron Lett. 1997, 38, 4337.
25. For cleavage-deprotection reactions see: (a) Varma, R.S.; Chatterjee, A.K. and Varma, M. Tetrahedron Lett. 1993, 34, 3207. (b) Varma, R.S.; Chatterjee, A.K. and Varma, M. Tetrahedron Lett. 1993, 34, 4603. (c) Varma, R.S.; Varma, M. and Chatterjee, A.K. J. Chem. Soc., Perkin. Trans. 1 1993, 999. (d) Varma, R.S.; Lamture, J.B. and Varma, M. Tetrahedron Lett. 1993, 34, 3029. (e) Varma, R.S. and Saini, R.K. Tetrahedron Lett. 1997, 38, 2623. (f) Varma, R.S. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 5427. (g) Varma, R.S. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 7973. (h) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 8819. For condensation-cyclization reactions see: (i) Varma, R.S.; Dahiya, R. and Kumar, S. Tetrahedron Lett. 1997, 38, 2039. (j) Varma, R.S. and Dahiya, R. Synlett 1997, 1245. (k) Varma, R.S.; Dahiya, R. and Kumar, S. Tetrahedron Lett. 1997, 38, 5131. (l) Varma, R.S. and Saini, R.K. Synlett 1997, 857. For oxidation reactions see: (m) Varma, R.S. and Dahiya, R. Tetrahedron Lett. 1997, 38, 2043. (n) Varma, R.S.; Saini, R.K. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 6525. (o) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 7029. (p) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 7823. For reduction reactions see: (q) Varma, R.S. and Saini, R.K. Tetrahedron Lett. 1997, 38, 4337.
26. For cleavage-deprotection reactions see: (a) Varma, R.S.; Chatterjee, A.K. and Varma, M. Tetrahedron Lett. 1993, 34, 3207. (b) Varma, R.S.; Chatterjee, A.K. and Varma, M. Tetrahedron Lett. 1993, 34, 4603. (c) Varma, R.S.; Varma, M. and Chatterjee, A.K. J. Chem. Soc., Perkin. Trans. 1 1993, 999. (d) Varma, R.S.; Lamture, J.B. and Varma, M. Tetrahedron Lett. 1993, 34, 3029. (e) Varma, R.S. and Saini, R.K. Tetrahedron Lett. 1997, 38, 2623. (f) Varma, R.S. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 5427. (g) Varma, R.S. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 7973. (h) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 8819. For condensation-cyclization reactions see: (i) Varma, R.S.; Dahiya, R. and Kumar, S. Tetrahedron Lett. 1997, 38, 2039. (j) Varma, R.S. and Dahiya, R. Synlett 1997, 1245. (k) Varma, R.S.; Dahiya, R. and Kumar, S. Tetrahedron Lett. 1997, 38, 5131. (l) Varma, R.S. and Saini, R.K. Synlett 1997, 857. For oxidation reactions see: (m) Varma, R.S. and Dahiya, R. Tetrahedron Lett. 1997, 38, 2043. (n) Varma, R.S.; Saini, R.K. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 6525. (o) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 7029. (p) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 7823. For reduction reactions see: (q) Varma, R.S. and Saini, R.K. Tetrahedron Lett. 1997, 38, 4337.
27. For cleavage-deprotection reactions see: (a) Varma, R.S.; Chatterjee, A.K. and Varma, M. Tetrahedron Lett. 1993, 34, 3207. (b) Varma, R.S.; Chatterjee, A.K. and Varma, M. Tetrahedron Lett. 1993, 34, 4603. (c) Varma, R.S.; Varma, M. and Chatterjee, A.K. J. Chem. Soc., Perkin. Trans. 1 1993, 999. (d) Varma, R.S.; Lamture, J.B. and Varma, M. Tetrahedron Lett. 1993, 34, 3029. (e) Varma, R.S. and Saini, R.K. Tetrahedron Lett. 1997, 38, 2623. (f) Varma, R.S. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 5427. (g) Varma, R.S. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 7973. (h) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 8819. For condensation-cyclization reactions see: (i) Varma, R.S.; Dahiya, R. and Kumar, S. Tetrahedron Lett. 1997, 38, 2039. (j) Varma, R.S. and Dahiya, R. Synlett 1997, 1245. (k) Varma, R.S.; Dahiya, R. and Kumar, S. Tetrahedron Lett. 1997, 38, 5131. (l) Varma, R.S. and Saini, R.K. Synlett 1997, 857. For oxidation reactions see: (m) Varma, R.S. and Dahiya, R. Tetrahedron Lett. 1997, 38, 2043. (n) Varma, R.S.; Saini, R.K. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 6525. (o) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 7029. (p) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 7823. For reduction reactions see: (q) Varma, R.S. and Saini, R.K. Tetrahedron Lett. 1997, 38, 4337.
28. For cleavage-deprotection reactions see: (a) Varma, R.S.; Chatterjee, A.K. and Varma, M. Tetrahedron Lett. 1993, 34, 3207. (b) Varma, R.S.; Chatterjee, A.K. and Varma, M. Tetrahedron Lett. 1993, 34, 4603. (c) Varma, R.S.; Varma, M. and Chatterjee, A.K. J. Chem. Soc., Perkin. Trans. 1 1993, 999. (d) Varma, R.S.; Lamture, J.B. and Varma, M. Tetrahedron Lett. 1993, 34, 3029. (e) Varma, R.S. and Saini, R.K. Tetrahedron Lett. 1997, 38, 2623. (f) Varma, R.S. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 5427. (g) Varma, R.S. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 7973. (h) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 8819. For condensation-cyclization reactions see: (i) Varma, R.S.; Dahiya, R. and Kumar, S. Tetrahedron Lett. 1997, 38, 2039. (j) Varma, R.S. and Dahiya, R. Synlett 1997, 1245. (k) Varma, R.S.; Dahiya, R. and Kumar, S. Tetrahedron Lett. 1997, 38, 5131. (l) Varma, R.S. and Saini, R.K. Synlett 1997, 857. For oxidation reactions see: (m) Varma, R.S. and Dahiya, R. Tetrahedron Lett. 1997, 38, 2043. (n) Varma, R.S.; Saini, R.K. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 6525. (o) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 7029. (p) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 7823. For reduction reactions see: (q) Varma, R.S. and Saini, R.K. Tetrahedron Lett. 1997, 38, 4337.
29. For cleavage-deprotection reactions see: (a) Varma, R.S.; Chatterjee, A.K. and Varma, M. Tetrahedron Lett. 1993, 34, 3207. (b) Varma, R.S.; Chatterjee, A.K. and Varma, M. Tetrahedron Lett. 1993, 34, 4603. (c) Varma, R.S.; Varma, M. and Chatterjee, A.K. J. Chem. Soc., Perkin. Trans. 1 1993, 999. (d) Varma, R.S.; Lamture, J.B. and Varma, M. Tetrahedron Lett. 1993, 34, 3029. (e) Varma, R.S. and Saini, R.K. Tetrahedron Lett. 1997, 38, 2623. (f) Varma, R.S. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 5427. (g) Varma, R.S. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 7973. (h) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 8819. For condensation-cyclization reactions see: (i) Varma, R.S.; Dahiya, R. and Kumar, S. Tetrahedron Lett. 1997, 38, 2039. (j) Varma, R.S. and Dahiya, R. Synlett 1997, 1245. (k) Varma, R.S.; Dahiya, R. and Kumar, S. Tetrahedron Lett. 1997, 38, 5131. (l) Varma, R.S. and Saini, R.K. Synlett 1997, 857. For oxidation reactions see: (m) Varma, R.S. and Dahiya, R. Tetrahedron Lett. 1997, 38, 2043. (n) Varma, R.S.; Saini, R.K. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 6525. (o) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 7029. (p) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 7823. For reduction reactions see: (q) Varma, R.S. and Saini, R.K. Tetrahedron Lett. 1997, 38, 4337.
30. For cleavage-deprotection reactions see: (a) Varma, R.S.; Chatterjee, A.K. and Varma, M. Tetrahedron Lett. 1993, 34, 3207. (b) Varma, R.S.; Chatterjee, A.K. and Varma, M. Tetrahedron Lett. 1993, 34, 4603. (c) Varma, R.S.; Varma, M. and Chatterjee, A.K. J. Chem. Soc., Perkin. Trans. 1 1993, 999. (d) Varma, R.S.; Lamture, J.B. and Varma, M. Tetrahedron Lett. 1993, 34, 3029. (e) Varma, R.S. and Saini, R.K. Tetrahedron Lett. 1997, 38, 2623. (f) Varma, R.S. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 5427. (g) Varma, R.S. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 7973. (h) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 8819. For condensation-cyclization reactions see: (i) Varma, R.S.; Dahiya, R. and Kumar, S. Tetrahedron Lett. 1997, 38, 2039. (j) Varma, R.S. and Dahiya, R. Synlett 1997, 1245. (k) Varma, R.S.; Dahiya, R. and Kumar, S. Tetrahedron Lett. 1997, 38, 5131. (l) Varma, R.S. and Saini, R.K. Synlett 1997, 857. For oxidation reactions see: (m) Varma, R.S. and Dahiya, R. Tetrahedron Lett. 1997, 38, 2043. (n) Varma, R.S.; Saini, R.K. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 6525. (o) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 7029. (p) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 7823. For reduction reactions see: (q) Varma, R.S. and Saini, R.K. Tetrahedron Lett. 1997, 38, 4337.
31. For cleavage-deprotection reactions see: (a) Varma, R.S.; Chatterjee, A.K. and Varma, M. Tetrahedron Lett. 1993, 34, 3207. (b) Varma, R.S.; Chatterjee, A.K. and Varma, M. Tetrahedron Lett. 1993, 34, 4603. (c) Varma, R.S.; Varma, M. and Chatterjee, A.K. J. Chem. Soc., Perkin. Trans. 1 1993, 999. (d) Varma, R.S.; Lamture, J.B. and Varma, M. Tetrahedron Lett. 1993, 34, 3029. (e) Varma, R.S. and Saini, R.K. Tetrahedron Lett. 1997, 38, 2623. (f) Varma, R.S. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 5427. (g) Varma, R.S. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 7973. (h) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 8819. For condensation-cyclization reactions see: (i) Varma, R.S.; Dahiya, R. and Kumar, S. Tetrahedron Lett. 1997, 38, 2039. (j) Varma, R.S. and Dahiya, R. Synlett 1997, 1245. (k) Varma, R.S.; Dahiya, R. and Kumar, S. Tetrahedron Lett. 1997, 38, 5131. (l) Varma, R.S. and Saini, R.K. Synlett 1997, 857. For oxidation reactions see: (m) Varma, R.S. and Dahiya, R. Tetrahedron Lett. 1997, 38, 2043. (n) Varma, R.S.; Saini, R.K. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 6525. (o) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 7029. (p) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 7823. For reduction reactions see: (q) Varma, R.S. and Saini, R.K. Tetrahedron Lett. 1997, 38, 4337.
32. For cleavage-deprotection reactions see: (a) Varma, R.S.; Chatterjee, A.K. and Varma, M. Tetrahedron Lett. 1993, 34, 3207. (b) Varma, R.S.; Chatterjee, A.K. and Varma, M. Tetrahedron Lett. 1993, 34, 4603. (c) Varma, R.S.; Varma, M. and Chatterjee, A.K. J. Chem. Soc., Perkin. Trans. 1 1993, 999. (d) Varma, R.S.; Lamture, J.B. and Varma, M. Tetrahedron Lett. 1993, 34, 3029. (e) Varma, R.S. and Saini, R.K. Tetrahedron Lett. 1997, 38, 2623. (f) Varma, R.S. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 5427. (g) Varma, R.S. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 7973. (h) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 8819. For condensation-cyclization reactions see: (i) Varma, R.S.; Dahiya, R. and Kumar, S. Tetrahedron Lett. 1997, 38, 2039. (j) Varma, R.S. and Dahiya, R. Synlett 1997, 1245. (k) Varma, R.S.; Dahiya, R. and Kumar, S. Tetrahedron Lett. 1997, 38, 5131. (l) Varma, R.S. and Saini, R.K. Synlett 1997, 857. For oxidation reactions see: (m) Varma, R.S. and Dahiya, R. Tetrahedron Lett. 1997, 38, 2043. (n) Varma, R.S.; Saini, R.K. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 6525. (o) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 7029. (p) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 7823. For reduction reactions see: (q) Varma, R.S. and Saini, R.K. Tetrahedron Lett. 1997, 38, 4337.
33. For cleavage-deprotection reactions see: (a) Varma, R.S.; Chatterjee, A.K. and Varma, M. Tetrahedron Lett. 1993, 34, 3207. (b) Varma, R.S.; Chatterjee, A.K. and Varma, M. Tetrahedron Lett. 1993, 34, 4603. (c) Varma, R.S.; Varma, M. and Chatterjee, A.K. J. Chem. Soc., Perkin. Trans. 1 1993, 999. (d) Varma, R.S.; Lamture, J.B. and Varma, M. Tetrahedron Lett. 1993, 34, 3029. (e) Varma, R.S. and Saini, R.K. Tetrahedron Lett. 1997, 38, 2623. (f) Varma, R.S. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 5427. (g) Varma, R.S. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 7973. (h) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 8819. For condensation-cyclization reactions see: (i) Varma, R.S.; Dahiya, R. and Kumar, S. Tetrahedron Lett. 1997, 38, 2039. (j) Varma, R.S. and Dahiya, R. Synlett 1997, 1245. (k) Varma, R.S.; Dahiya, R. and Kumar, S. Tetrahedron Lett. 1997, 38, 5131. (l) Varma, R.S. and Saini, R.K. Synlett 1997, 857. For oxidation reactions see: (m) Varma, R.S. and Dahiya, R. Tetrahedron Lett. 1997, 38, 2043. (n) Varma, R.S.; Saini, R.K. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 6525. (o) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 7029. (p) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 7823. For reduction reactions see: (q) Varma, R.S. and Saini, R.K. Tetrahedron Lett. 1997, 38, 4337.
34. For cleavage-deprotection reactions see: (a) Varma, R.S.; Chatterjee, A.K. and Varma, M. Tetrahedron Lett. 1993, 34, 3207. (b) Varma, R.S.; Chatterjee, A.K. and Varma, M. Tetrahedron Lett. 1993, 34, 4603. (c) Varma, R.S.; Varma, M. and Chatterjee, A.K. J. Chem. Soc., Perkin. Trans. 1 1993, 999. (d) Varma, R.S.; Lamture, J.B. and Varma, M. Tetrahedron Lett. 1993, 34, 3029. (e) Varma, R.S. and Saini, R.K. Tetrahedron Lett. 1997, 38, 2623. (f) Varma, R.S. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 5427. (g) Varma, R.S. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 7973. (h) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 8819. For condensation-cyclization reactions see: (i) Varma, R.S.; Dahiya, R. and Kumar, S. Tetrahedron Lett. 1997, 38, 2039. (j) Varma, R.S. and Dahiya, R. Synlett 1997, 1245. (k) Varma, R.S.; Dahiya, R. and Kumar, S. Tetrahedron Lett. 1997, 38, 5131. (l) Varma, R.S. and Saini, R.K. Synlett 1997, 857. For oxidation reactions see: (m) Varma, R.S. and Dahiya, R. Tetrahedron Lett. 1997, 38, 2043. (n) Varma, R.S.; Saini, R.K. and Meshram, H.M. Tetrahedron Lett. 1997, 38, 6525. (o) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 7029. (p) Varma, R.S.; Dahiya, R. and Saini, R.K. Tetrahedron Lett. 1997, 38, 7823. For reduction reactions see: (q) Varma, R.S. and Saini, R.K. Tetrahedron Lett. 1997, 38, 4337.
35. Cornelis, A. and Laszlo, P. Synthesis 1985, 909.
36. Mel'nikov, N.N. Uspekhi Khim. 1936, 5, 443.
37. Peak, D.A. and Watkins, T.I. J. Chem. Soc. 1950, 445.
38. Overberger, C.G. and Cummins, R. W. J. Am. Chem. Soc. 1953, 75, 4250.
39. Edwards, D. and Stenlake, J.B. J. Chem. Soc. 1954, 3272.
40. (a) Addison, C.C. and Sheldon, J.C. J. Chem. Soc. 1956, 2705.
41. (b) Whittaker, R.W. and Sisler, H.H. J. Org. Chem. 1960, 25, 1038.
42. Bordwell, F.G. and Boutan, P.J. J. Am. Chem. Soc. 1957, 79, 717.
43. (a) Barnard, D. J. Chem. Soc. 1957, 4547.
44. (b) Horner, L.; Schaefer, H. and Ludwig, W. Chem. Ber. 1958, 91, 75.
45. (a) Leonard, N.J. and Johnson, C.R. J. Org. Chem. 1962, 27, 282.
46. (b) Hiskey, R.G. and Harpold, M.A. J. Org. Chem. 1967, 32, 3191.
47. (a) Ford-Moore, A.H. J. Chem. Soc. 1949, 2126.
48. (b) Ando, W.; Tajima, R. and Takata, T. Tetrahedron Lett. 1982, 23, 1685.
49. (c) Barton, D.H.R.; Godfrey, G.R.A.; Morzycki, J.W.; Motherwell, W.B. and Stobie, A. Tetrahedron Lett. 1982, 23, 957.
50. (d) Barbas, D.; Spyroudis, S. and Varvoglis, A. J. Chem. Res. (S), 1985, 186 and J. Chem. Res.(M) 1985, 2201.
51. (d) Barbas, D.; Spyroudis, S. and Varvoglis, A. J. Chem. Res. (S), 1985, 186 and J. Chem. Res.(M) 1985, 2201.
52. (e) Varma, R.S.; Dahiya, R. and Saini, R.K. J. Chem. Res. (S), 1998, in press and J. Chem. Res. (M) 1998, in press.
53. (e) Varma, R.S.; Dahiya, R. and Saini, R.K. J. Chem. Res. (S), 1998, in press and J. Chem. Res. (M) 1998, in press.
54. McKillop, A. and Tarbin, J.A. Tetrahedron Lett. 1983, 24, 1505.
55. (a) Patai, S.; Rappoport, Z. and Stirling, C. Eds. "The Chemistry of sulfphones and sulphoxides," John Wiley and Sons, Chichester, U.K., 1988.
56. (b) Greenhalgh, R.P. Synlett 1992, 235.
57. (c) Reddy, R.S.; Reddy, J.S.; Kumar, R. and Kumar, P. J. Chem. Soc., Chem. Commun. 1992, 84;
58. (d) Aldea, R. and Alper, H. J. Org. Chem. 1995, 60, 8365.
59. (e) Bosch, E. and Kochi, J.K. J. Org. Chem. 1995, 60, 3172.
60. (f) Orito, K.; Hatakeyama, T.; Takeo , M. and Suginome, H. Synthesis 1995, 1357.
61. (g) Arterburn, J.B. and Nelson, S.L. J. Org. Chem. 1996, 61, 2260.
62. (h) Reddy, T.I. and Varma, R.S. J. Chem. Soc., Chem. Commun. 1997, 471.
63. (i) Rao, T.V.; Sain, B.; Kumar, K.; Murthy, P.S.; Rao, T.S.R.P. and Joshi, G.C. Synth. Commun. 1998, 28, 319.
64. Liu, K-T. and Tong, Y-C. J. Org. Chem. 1978, 43, 2717.
65. Gupta, D.N.; Hodge, P. and Davies, J.E. J. Chem. Soc., Perkin Trans. 1, 1981, 2970.
66. Raner, K.D.; Strauss, C.R.; Vyskoc, F. and Mokbel, L. J. Org. Chem. 1993, 58, 950. The temperature of the reaction mixture inside the alumina bath reached ∼80°C after 1 minute of irradiation in a MW oven operating at full power (900 Watts).