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Volumn 119, Issue 42, 1997, Pages 10054-10063

An efficient synthesis of functionalized helicenes

Author keywords

[No Author keywords available]

Indexed keywords

FUSED HETEROCYCLIC RINGS; QUINONE DERIVATIVE;

EID: 0030721577     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja9721327     Document Type: Article
Times cited : (96)

References (117)
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    • See footnote 12 in ref 7b. In addition, stilbene cyclizations: (a) Staab; H. A.; Diehm, M.; Krieger, C. Tetrahedron Lett. 1994, 35, 8357. (b) Larsen, J.; Bechgaard, K. J. Org. Chem. 1996, 67, 1151. (c) Laatsch, H.; Talvitie, A.; Kral, A.; Ernst, B.-P.; Noltemeyer, M. J. Prakt. Chem. 1996, 338, 140. Biaryl couplings: (d) Tanaka, K.; Suzuki, H.; Osuga, H. J. Org. Chem. 1997, 62, 4465, and references therein, (e) Pereira, D. E.; Neelima; Leonard, N. J. Tetrahedron 1990, 46, 5895. (f) Pischel, I.; Grimme, S.; Kotila, S.; Nieger, M.; Vögtle, F. Tetrahedron Asymmetry 1996, 7, 109. The trimerization of 9,10-dichlorophenanthrene: (g) Carey, J. G.; Millar, I. T. J. Chem. Soc. 1959, 3144. Diels-Alder additions to tetrahydro-1,1′-binaphthyl: (h) Minuti, L.; Taticchi, A.; Marrocchi, A.; Gacs-Baitz, E. Tetrahedron 1997, 53, 6873. Altman, Y.; Ginsburg, D. J. Chem. Soc. 1959, 466, and references therein.
    • (1994) Tetrahedron Lett. , vol.35 , pp. 8357
    • Staab, H.A.1    Diehm, M.2    Krieger, C.3
  • 12
    • 0001006849 scopus 로고    scopus 로고
    • See footnote 12 in ref 7b. In addition, stilbene cyclizations: (a) Staab; H. A.; Diehm, M.; Krieger, C. Tetrahedron Lett. 1994, 35, 8357. (b) Larsen, J.; Bechgaard, K. J. Org. Chem. 1996, 67, 1151. (c) Laatsch, H.; Talvitie, A.; Kral, A.; Ernst, B.-P.; Noltemeyer, M. J. Prakt. Chem. 1996, 338, 140. Biaryl couplings: (d) Tanaka, K.; Suzuki, H.; Osuga, H. J. Org. Chem. 1997, 62, 4465, and references therein, (e) Pereira, D. E.; Neelima; Leonard, N. J. Tetrahedron 1990, 46, 5895. (f) Pischel, I.; Grimme, S.; Kotila, S.; Nieger, M.; Vögtle, F. Tetrahedron Asymmetry 1996, 7, 109. The trimerization of 9,10-dichlorophenanthrene: (g) Carey, J. G.; Millar, I. T. J. Chem. Soc. 1959, 3144. Diels-Alder additions to tetrahydro-1,1′-binaphthyl: (h) Minuti, L.; Taticchi, A.; Marrocchi, A.; Gacs-Baitz, E. Tetrahedron 1997, 53, 6873. Altman, Y.; Ginsburg, D. J. Chem. Soc. 1959, 466, and references therein.
    • (1996) J. Org. Chem. , vol.67 , pp. 1151
    • Larsen, J.1    Bechgaard, K.2
  • 13
    • 0642376795 scopus 로고    scopus 로고
    • See footnote 12 in ref 7b. In addition, stilbene cyclizations: (a) Staab; H. A.; Diehm, M.; Krieger, C. Tetrahedron Lett. 1994, 35, 8357. (b) Larsen, J.; Bechgaard, K. J. Org. Chem. 1996, 67, 1151. (c) Laatsch, H.; Talvitie, A.; Kral, A.; Ernst, B.-P.; Noltemeyer, M. J. Prakt. Chem. 1996, 338, 140. Biaryl couplings: (d) Tanaka, K.; Suzuki, H.; Osuga, H. J. Org. Chem. 1997, 62, 4465, and references therein, (e) Pereira, D. E.; Neelima; Leonard, N. J. Tetrahedron 1990, 46, 5895. (f) Pischel, I.; Grimme, S.; Kotila, S.; Nieger, M.; Vögtle, F. Tetrahedron Asymmetry 1996, 7, 109. The trimerization of 9,10-dichlorophenanthrene: (g) Carey, J. G.; Millar, I. T. J. Chem. Soc. 1959, 3144. Diels-Alder additions to tetrahydro-1,1′-binaphthyl: (h) Minuti, L.; Taticchi, A.; Marrocchi, A.; Gacs-Baitz, E. Tetrahedron 1997, 53, 6873. Altman, Y.; Ginsburg, D. J. Chem. Soc. 1959, 466, and references therein.
    • (1996) J. Prakt. Chem. , vol.338 , pp. 140
    • Laatsch, H.1    Talvitie, A.2    Kral, A.3    Ernst, B.-P.4    Noltemeyer, M.5
  • 14
    • 0000954764 scopus 로고    scopus 로고
    • and references therein
    • See footnote 12 in ref 7b. In addition, stilbene cyclizations: (a) Staab; H. A.; Diehm, M.; Krieger, C. Tetrahedron Lett. 1994, 35, 8357. (b) Larsen, J.; Bechgaard, K. J. Org. Chem. 1996, 67, 1151. (c) Laatsch, H.; Talvitie, A.; Kral, A.; Ernst, B.-P.; Noltemeyer, M. J. Prakt. Chem. 1996, 338, 140. Biaryl couplings: (d) Tanaka, K.; Suzuki, H.; Osuga, H. J. Org. Chem. 1997, 62, 4465, and references therein, (e) Pereira, D. E.; Neelima; Leonard, N. J. Tetrahedron 1990, 46, 5895. (f) Pischel, I.; Grimme, S.; Kotila, S.; Nieger, M.; Vögtle, F. Tetrahedron Asymmetry 1996, 7, 109. The trimerization of 9,10-dichlorophenanthrene: (g) Carey, J. G.; Millar, I. T. J. Chem. Soc. 1959, 3144. Diels-Alder additions to tetrahydro-1,1′-binaphthyl: (h) Minuti, L.; Taticchi, A.; Marrocchi, A.; Gacs-Baitz, E. Tetrahedron 1997, 53, 6873. Altman, Y.; Ginsburg, D. J. Chem. Soc. 1959, 466, and references therein.
    • (1997) J. Org. Chem. , vol.62 , pp. 4465
    • Tanaka, K.1    Suzuki, H.2    Osuga, H.3
  • 15
    • 0141586666 scopus 로고
    • See footnote 12 in ref 7b. In addition, stilbene cyclizations: (a) Staab; H. A.; Diehm, M.; Krieger, C. Tetrahedron Lett. 1994, 35, 8357. (b) Larsen, J.; Bechgaard, K. J. Org. Chem. 1996, 67, 1151. (c) Laatsch, H.; Talvitie, A.; Kral, A.; Ernst, B.-P.; Noltemeyer, M. J. Prakt. Chem. 1996, 338, 140. Biaryl couplings: (d) Tanaka, K.; Suzuki, H.; Osuga, H. J. Org. Chem. 1997, 62, 4465, and references therein, (e) Pereira, D. E.; Neelima; Leonard, N. J. Tetrahedron 1990, 46, 5895. (f) Pischel, I.; Grimme, S.; Kotila, S.; Nieger, M.; Vögtle, F. Tetrahedron Asymmetry 1996, 7, 109. The trimerization of 9,10-dichlorophenanthrene: (g) Carey, J. G.; Millar, I. T. J. Chem. Soc. 1959, 3144. Diels-Alder additions to tetrahydro-1,1′-binaphthyl: (h) Minuti, L.; Taticchi, A.; Marrocchi, A.; Gacs-Baitz, E. Tetrahedron 1997, 53, 6873. Altman, Y.; Ginsburg, D. J. Chem. Soc. 1959, 466, and references therein.
    • (1990) Tetrahedron , vol.46 , pp. 5895
    • Pereira, D.E.1    Neelima2    Leonard, N.J.3
  • 16
    • 0030064126 scopus 로고    scopus 로고
    • See footnote 12 in ref 7b. In addition, stilbene cyclizations: (a) Staab; H. A.; Diehm, M.; Krieger, C. Tetrahedron Lett. 1994, 35, 8357. (b) Larsen, J.; Bechgaard, K. J. Org. Chem. 1996, 67, 1151. (c) Laatsch, H.; Talvitie, A.; Kral, A.; Ernst, B.-P.; Noltemeyer, M. J. Prakt. Chem. 1996, 338, 140. Biaryl couplings: (d) Tanaka, K.; Suzuki, H.; Osuga, H. J. Org. Chem. 1997, 62, 4465, and references therein, (e) Pereira, D. E.; Neelima; Leonard, N. J. Tetrahedron 1990, 46, 5895. (f) Pischel, I.; Grimme, S.; Kotila, S.; Nieger, M.; Vögtle, F. Tetrahedron Asymmetry 1996, 7, 109. The trimerization of 9,10-dichlorophenanthrene: (g) Carey, J. G.; Millar, I. T. J. Chem. Soc. 1959, 3144. Diels-Alder additions to tetrahydro-1,1′-binaphthyl: (h) Minuti, L.; Taticchi, A.; Marrocchi, A.; Gacs-Baitz, E. Tetrahedron 1997, 53, 6873. Altman, Y.; Ginsburg, D. J. Chem. Soc. 1959, 466, and references therein.
    • (1996) Tetrahedron Asymmetry , vol.7 , pp. 109
    • Pischel, I.1    Grimme, S.2    Kotila, S.3    Nieger, M.4    Vögtle, F.5
  • 17
    • 37049061408 scopus 로고
    • See footnote 12 in ref 7b. In addition, stilbene cyclizations: (a) Staab; H. A.; Diehm, M.; Krieger, C. Tetrahedron Lett. 1994, 35, 8357. (b) Larsen, J.; Bechgaard, K. J. Org. Chem. 1996, 67, 1151. (c) Laatsch, H.; Talvitie, A.; Kral, A.; Ernst, B.-P.; Noltemeyer, M. J. Prakt. Chem. 1996, 338, 140. Biaryl couplings: (d) Tanaka, K.; Suzuki, H.; Osuga, H. J. Org. Chem. 1997, 62, 4465, and references therein, (e) Pereira, D. E.; Neelima; Leonard, N. J. Tetrahedron 1990, 46, 5895. (f) Pischel, I.; Grimme, S.; Kotila, S.; Nieger, M.; Vögtle, F. Tetrahedron Asymmetry 1996, 7, 109. The trimerization of 9,10-dichlorophenanthrene: (g) Carey, J. G.; Millar, I. T. J. Chem. Soc. 1959, 3144. Diels-Alder additions to tetrahydro-1,1′-binaphthyl: (h) Minuti, L.; Taticchi, A.; Marrocchi, A.; Gacs-Baitz, E. Tetrahedron 1997, 53, 6873. Altman, Y.; Ginsburg, D. J. Chem. Soc. 1959, 466, and references therein.
    • (1959) J. Chem. Soc. , pp. 3144
    • Carey, J.G.1    Millar, I.T.2
  • 18
    • 0030986374 scopus 로고    scopus 로고
    • See footnote 12 in ref 7b. In addition, stilbene cyclizations: (a) Staab; H. A.; Diehm, M.; Krieger, C. Tetrahedron Lett. 1994, 35, 8357. (b) Larsen, J.; Bechgaard, K. J. Org. Chem. 1996, 67, 1151. (c) Laatsch, H.; Talvitie, A.; Kral, A.; Ernst, B.-P.; Noltemeyer, M. J. Prakt. Chem. 1996, 338, 140. Biaryl couplings: (d) Tanaka, K.; Suzuki, H.; Osuga, H. J. Org. Chem. 1997, 62, 4465, and references therein, (e) Pereira, D. E.; Neelima; Leonard, N. J. Tetrahedron 1990, 46, 5895. (f) Pischel, I.; Grimme, S.; Kotila, S.; Nieger, M.; Vögtle, F. Tetrahedron Asymmetry 1996, 7, 109. The trimerization of 9,10-dichlorophenanthrene: (g) Carey, J. G.; Millar, I. T. J. Chem. Soc. 1959, 3144. Diels-Alder additions to tetrahydro-1,1′-binaphthyl: (h) Minuti, L.; Taticchi, A.; Marrocchi, A.; Gacs-Baitz, E. Tetrahedron 1997, 53, 6873. Altman, Y.; Ginsburg, D. J. Chem. Soc. 1959, 466, and references therein.
    • (1997) Tetrahedron , vol.53 , pp. 6873
    • Minuti, L.1    Taticchi, A.2    Marrocchi, A.3    Gacs-Baitz, E.4
  • 19
    • 9844267945 scopus 로고
    • and references therein
    • See footnote 12 in ref 7b. In addition, stilbene cyclizations: (a) Staab; H. A.; Diehm, M.; Krieger, C. Tetrahedron Lett. 1994, 35, 8357. (b) Larsen, J.; Bechgaard, K. J. Org. Chem. 1996, 67, 1151. (c) Laatsch, H.; Talvitie, A.; Kral, A.; Ernst, B.-P.; Noltemeyer, M. J. Prakt. Chem. 1996, 338, 140. Biaryl couplings: (d) Tanaka, K.; Suzuki, H.; Osuga, H. J. Org. Chem. 1997, 62, 4465, and references therein, (e) Pereira, D. E.; Neelima; Leonard, N. J. Tetrahedron 1990, 46, 5895. (f) Pischel, I.; Grimme, S.; Kotila, S.; Nieger, M.; Vögtle, F. Tetrahedron Asymmetry 1996, 7, 109. The trimerization of 9,10-dichlorophenanthrene: (g) Carey, J. G.; Millar, I. T. J. Chem. Soc. 1959, 3144. Diels-Alder additions to tetrahydro-1,1′-binaphthyl: (h) Minuti, L.; Taticchi, A.; Marrocchi, A.; Gacs-Baitz, E. Tetrahedron 1997, 53, 6873. Altman, Y.; Ginsburg, D. J. Chem. Soc. 1959, 466, and references therein.
    • (1959) Chem. Soc. , pp. 466
    • Altman, Y.1    Ginsburg, D.J.2
  • 22
    • 9844263735 scopus 로고    scopus 로고
    • For the few functionalized examples known until recently, see footnote 4 of ref 7b. In addition, pyridine-containing helicenes: (a) Reference 6a
    • For the few functionalized examples known until recently, see footnote 4 of ref 7b. In addition, pyridine-containing helicenes: (a) Reference 6a. (b) Bell, T. W.; Jousselin, J. Am. Chem. Soc. 1991, 113, 6283. (c) Deshayes, K.; Broene, R. D.; Chao, I.; Knobler, C. B.; Diederich, F. J. Org. Chem. 1991, 56, 6787. Helicenecarboxylic acid derivatives: (d) Owens, L.; Thilgen, C.; Diedrich, F.; Knobler, C. B. Helv. Chim. Acta 1993, 76, 2757. (e) Frimer, A. A.; Kinder, J. D.; Youngs, W. J.; Meador, M. A. B. J. Org. Chem. 1995, 60, 1658. A phosphine: (f) Terfort, A.; Görls, H.; Brunner, H. Synthesis 1997, 79. (g) Reetz, M. T.; Beuttenmüller, E. W.; Goddard, R. Tetrahedron Lett. 1997, 38, 3211. [5]-, [6]-, [7]-, and [8]helicenebisquinones: ref 7.
  • 23
    • 0001383629 scopus 로고
    • For the few functionalized examples known until recently, see footnote 4 of ref 7b. In addition, pyridine-containing helicenes: (a) Reference 6a. (b) Bell, T. W.; Jousselin, J. Am. Chem. Soc. 1991, 113, 6283. (c) Deshayes, K.; Broene, R. D.; Chao, I.; Knobler, C. B.; Diederich, F. J. Org. Chem. 1991, 56, 6787. Helicenecarboxylic acid derivatives: (d) Owens, L.; Thilgen, C.; Diedrich, F.; Knobler, C. B. Helv. Chim. Acta 1993, 76, 2757. (e) Frimer, A. A.; Kinder, J. D.; Youngs, W. J.; Meador, M. A. B. J. Org. Chem. 1995, 60, 1658. A phosphine: (f) Terfort, A.; Görls, H.; Brunner, H. Synthesis 1997, 79. (g) Reetz, M. T.; Beuttenmüller, E. W.; Goddard, R. Tetrahedron Lett. 1997, 38, 3211. [5]-, [6]-, [7]-, and [8]helicenebisquinones: ref 7.
    • (1991) J. Am. Chem. Soc. , vol.113 , pp. 6283
    • Bell, T.W.1    Jousselin2
  • 24
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    • For the few functionalized examples known until recently, see footnote 4 of ref 7b. In addition, pyridine-containing helicenes: (a) Reference 6a. (b) Bell, T. W.; Jousselin, J. Am. Chem. Soc. 1991, 113, 6283. (c) Deshayes, K.; Broene, R. D.; Chao, I.; Knobler, C. B.; Diederich, F. J. Org. Chem. 1991, 56, 6787. Helicenecarboxylic acid derivatives: (d) Owens, L.; Thilgen, C.; Diedrich, F.; Knobler, C. B. Helv. Chim. Acta 1993, 76, 2757. (e) Frimer, A. A.; Kinder, J. D.; Youngs, W. J.; Meador, M. A. B. J. Org. Chem. 1995, 60, 1658. A phosphine: (f) Terfort, A.; Görls, H.; Brunner, H. Synthesis 1997, 79. (g) Reetz, M. T.; Beuttenmüller, E. W.; Goddard, R. Tetrahedron Lett. 1997, 38, 3211. [5]-, [6]-, [7]-, and [8]helicenebisquinones: ref 7.
    • (1991) J. Org. Chem. , vol.56 , pp. 6787
    • Deshayes, K.1    Broene, R.D.2    Chao, I.3    Knobler, C.B.4    Diederich, F.5
  • 25
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    • For the few functionalized examples known until recently, see footnote 4 of ref 7b. In addition, pyridine-containing helicenes: (a) Reference 6a. (b) Bell, T. W.; Jousselin, J. Am. Chem. Soc. 1991, 113, 6283. (c) Deshayes, K.; Broene, R. D.; Chao, I.; Knobler, C. B.; Diederich, F. J. Org. Chem. 1991, 56, 6787. Helicenecarboxylic acid derivatives: (d) Owens, L.; Thilgen, C.; Diedrich, F.; Knobler, C. B. Helv. Chim. Acta 1993, 76, 2757. (e) Frimer, A. A.; Kinder, J. D.; Youngs, W. J.; Meador, M. A. B. J. Org. Chem. 1995, 60, 1658. A phosphine: (f) Terfort, A.; Görls, H.; Brunner, H. Synthesis 1997, 79. (g) Reetz, M. T.; Beuttenmüller, E. W.; Goddard, R. Tetrahedron Lett. 1997, 38, 3211. [5]-, [6]-, [7]-, and [8]helicenebisquinones: ref 7.
    • (1993) Helv. Chim. Acta , vol.76 , pp. 2757
    • Owens, L.1    Thilgen, C.2    Diedrich, F.3    Knobler, C.B.4
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    • For the few functionalized examples known until recently, see footnote 4 of ref 7b. In addition, pyridine-containing helicenes: (a) Reference 6a. (b) Bell, T. W.; Jousselin, J. Am. Chem. Soc. 1991, 113, 6283. (c) Deshayes, K.; Broene, R. D.; Chao, I.; Knobler, C. B.; Diederich, F. J. Org. Chem. 1991, 56, 6787. Helicenecarboxylic acid derivatives: (d) Owens, L.; Thilgen, C.; Diedrich, F.; Knobler, C. B. Helv. Chim. Acta 1993, 76, 2757. (e) Frimer, A. A.; Kinder, J. D.; Youngs, W. J.; Meador, M. A. B. J. Org. Chem. 1995, 60, 1658. A phosphine: (f) Terfort, A.; Görls, H.; Brunner, H. Synthesis 1997, 79. (g) Reetz, M. T.; Beuttenmüller, E. W.; Goddard, R. Tetrahedron Lett. 1997, 38, 3211. [5]-, [6]-, [7]-, and [8]helicenebisquinones: ref 7.
    • (1995) J. Org. Chem. , vol.60 , pp. 1658
    • Frimer, A.A.1    Kinder, J.D.2    Youngs, W.J.3    Meador, M.A.B.4
  • 27
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    • For the few functionalized examples known until recently, see footnote 4 of ref 7b. In addition, pyridine-containing helicenes: (a) Reference 6a. (b) Bell, T. W.; Jousselin, J. Am. Chem. Soc. 1991, 113, 6283. (c) Deshayes, K.; Broene, R. D.; Chao, I.; Knobler, C. B.; Diederich, F. J. Org. Chem. 1991, 56, 6787. Helicenecarboxylic acid derivatives: (d) Owens, L.; Thilgen, C.; Diedrich, F.; Knobler, C. B. Helv. Chim. Acta 1993, 76, 2757. (e) Frimer, A. A.; Kinder, J. D.; Youngs, W. J.; Meador, M. A. B. J. Org. Chem. 1995, 60, 1658. A phosphine: (f) Terfort, A.; Görls, H.; Brunner, H. Synthesis 1997, 79. (g) Reetz, M. T.; Beuttenmüller, E. W.; Goddard, R. Tetrahedron Lett. 1997, 38, 3211. [5]-, [6]-, [7]-, and [8]helicenebisquinones: ref 7.
    • (1997) Synthesis , pp. 79
    • Terfort, A.1    Görls, H.2    Brunner, H.3
  • 28
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    • [5]-, [6]-, [7]-, and [8]helicenebisquinones: ref 7
    • For the few functionalized examples known until recently, see footnote 4 of ref 7b. In addition, pyridine-containing helicenes: (a) Reference 6a. (b) Bell, T. W.; Jousselin, J. Am. Chem. Soc. 1991, 113, 6283. (c) Deshayes, K.; Broene, R. D.; Chao, I.; Knobler, C. B.; Diederich, F. J. Org. Chem. 1991, 56, 6787. Helicenecarboxylic acid derivatives: (d) Owens, L.; Thilgen, C.; Diedrich, F.; Knobler, C. B. Helv. Chim. Acta 1993, 76, 2757. (e) Frimer, A. A.; Kinder, J. D.; Youngs, W. J.; Meador, M. A. B. J. Org. Chem. 1995, 60, 1658. A phosphine: (f) Terfort, A.; Görls, H.; Brunner, H. Synthesis 1997, 79. (g) Reetz, M. T.; Beuttenmüller, E. W.; Goddard, R. Tetrahedron Lett. 1997, 38, 3211. [5]-, [6]-, [7]-, and [8]helicenebisquinones: ref 7.
    • (1997) Tetrahedron Lett. , vol.38 , pp. 3211
    • Reetz, M.T.1    Beuttenmüller, E.W.2    Goddard, R.3
  • 29
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    • In part the reason is that for the photocyclizations, the solutions must be very dilute. See footnote 3 in reference 7b
    • In part the reason is that for the photocyclizations, the solutions must be very dilute. See footnote 3 in reference 7b.
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    • 7a
    • 7a
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    • 5a,13
    • 5a,13
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    • The Supporting Information describes how 4a-c, 6a,b, and 12 were Prepared
    • The Supporting Information describes how 4a-c, 6a,b, and 12 were Prepared.
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    • Zinc, acetic anhydride or benzoyl chloride, and pyridine or other tertiary amines convert quinones into hydroquinone esters: (a) Fieser, L. F.; Campbell, W. P.; Fry, E. M.; Gates, Jr., M. D. J. Am. Chem. Soc. 1939, 61, 3216. (b) Gaertner, R. J. Org. Chem. 1959, 24, 61.
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    • Fieser, L.F.1    Campbell, W.P.2    Fry, E.M.3    Gates Jr., M.D.4
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    • Zinc, acetic anhydride or benzoyl chloride, and pyridine or other tertiary amines convert quinones into hydroquinone esters: (a) Fieser, L. F.; Campbell, W. P.; Fry, E. M.; Gates, Jr., M. D. J. Am. Chem. Soc. 1939, 61, 3216. (b) Gaertner, R. J. Org. Chem. 1959, 24, 61.
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    • and references cited therein
    • (a) Baltzly, R.; Lorz, E. J. Am. Chem. Soc. 1948, 70, 861, and references cited therein,
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    • Ph.D. Dissertation, Columbia University
    • Willmore, N. D. Ph.D. Dissertation, Columbia University, 1994.
    • (1994)
    • Willmore, N.D.1
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    • 1, orange crystal, a = 9.721(2) Å, b = 21.389(6) Å. c = 13.604(3) Å, β = 98.49-(2)°, Z = 2, R (obs data) = 7.76%, wR = 10.24%, R (all data) = 9.88%, wR = 10.85%, GOF = 1.71
    • 1, orange crystal, a = 9.721(2) Å, b = 21.389(6) Å. c = 13.604(3) Å, β = 98.49-(2)°, Z = 2, R (obs data) = 7.76%, wR = 10.24%, R (all data) = 9.88%, wR = 10.85%, GOF = 1.71.
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    • Rahman, A-u., Ed.: Elsevier: New York
    • Related reactions are Diels-Alder additions of benzynes and methyleneisoquinolines or related structures: (a) Saá, C.; Guitian, E.; Castedo, L.; Saá J. M. Tetrahedron Lett. 1985, 26, 4559. (b) Castedo, L.; Guitián, E.; Saá, C.; Suau, R.; Saá. J. M. Tetrahedron Lett. 1983, 24, 2107. (c) Atanes, N.; Castedo, L; Guitián, E.; Saá, C.; Saá, J. M.; Suau, R. J. Org. Chem. 1991, 56, 2984. (d) Castedo, L; Guitian, E. In Studies in Natural Products Chemistry, Volume 3: Stereoselective Synthesis (Part B); Rahman, A-u., Ed.: Elsevier: New York. 1989; pp 417-454.
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    • Inversion barriers have been calculated for other helicenes. See reference 13
    • Inversion barriers have been calculated for other helicenes. See reference 13.
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    • 3 resulted in significant protodesilylation
    • 3 resulted in significant protodesilylation.


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