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Volumn 7, Issue 6, 2003, Pages 821-827

Development of Jacobsen Asymmetric Epoxidation and Sharpless Asymmetric Dihydroxylation Methods for the Large-Scale Preparation of a Chiral Dihydrobenzofuran Epoxide

Author keywords

[No Author keywords available]

Indexed keywords

3 CHLOROPERBENZOIC ACID; ALCOHOL; DICHLOROMETHANE; DIHYDROBENZOFURAN DERIVATIVE; DIHYDROBENZOFURAN EPOXIDE; EPOXIDE; OXIDE; TETRAHYDROFURAN DERIVATIVE; UNCLASSIFIED DRUG;

EID: 0347996091     PISSN: 10836160     EISSN: None     Source Type: Journal    
DOI: 10.1021/op025622e     Document Type: Article
Times cited : (36)

References (55)
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  • 13
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    • (g) Oehlschlager, A. C. In Stereoselective Synthesis; Helmchen, G., Hoffmann, R. W., Mulzer, J., Schaumann, E., Eds.; Georg Thieme Verlag: New York, 1996; p 4675 and references therein.
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    • (g) Pietikainen, P. Tetrahedron 2000, 56, 417. In our labs the catalyst 7 was prepared at 500 g scale.
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    • We have also investigated chemoenzymatic approaches for the preparation of 4; see: (a) Goswami, A.; Totleben, M. J.; Singh, A. K.; Patel, R. N. Tetrahedron: Asymmetry 1999, 10, 3167. (b) Goswami, A.; Mirfakhrae, K. D.; Totleben, M. J.; Swaminathan, S.; Patel, R. N. J. Ind. Microbiol. Biotechnol. 2001, 26, 259. (c) Goswami, A.; Mirfakhrae, K. D.; Patel, R. N. Tetrahedron: Asymmetry 1999, 10, 4239.
    • (1999) Tetrahedron: Asymmetry , vol.10 , pp. 3167
    • Goswami, A.1    Totleben, M.J.2    Singh, A.K.3    Patel, R.N.4
  • 34
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    • We have also investigated chemoenzymatic approaches for the preparation of 4; see: (a) Goswami, A.; Totleben, M. J.; Singh, A. K.; Patel, R. N. Tetrahedron: Asymmetry 1999, 10, 3167. (b) Goswami, A.; Mirfakhrae, K. D.; Totleben, M. J.; Swaminathan, S.; Patel, R. N. J. Ind. Microbiol. Biotechnol. 2001, 26, 259. (c) Goswami, A.; Mirfakhrae, K. D.; Patel, R. N. Tetrahedron: Asymmetry 1999, 10, 4239.
    • (2001) J. Ind. Microbiol. Biotechnol. , vol.26 , pp. 259
    • Goswami, A.1    Mirfakhrae, K.D.2    Totleben, M.J.3    Swaminathan, S.4    Patel, R.N.5
  • 35
    • 0033407110 scopus 로고    scopus 로고
    • We have also investigated chemoenzymatic approaches for the preparation of 4; see: (a) Goswami, A.; Totleben, M. J.; Singh, A. K.; Patel, R. N. Tetrahedron: Asymmetry 1999, 10, 3167. (b) Goswami, A.; Mirfakhrae, K. D.; Totleben, M. J.; Swaminathan, S.; Patel, R. N. J. Ind. Microbiol. Biotechnol. 2001, 26, 259. (c) Goswami, A.; Mirfakhrae, K. D.; Patel, R. N. Tetrahedron: Asymmetry 1999, 10, 4239.
    • (1999) Tetrahedron: Asymmetry , vol.10 , pp. 4239
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    • (d) Shanley, E. S. Chem. Eng. News 1978, 56(29), 43. m-CPBA was described as a safe alternate to Davis reagent in a large-scale synthesis of a drug intermediate. See: Stappers, F.; Broeckx, R.; Leurs, S.; Bergh, L. V. D.; Agten, J.; Lambrechts, A.; Heuvel, D. V. D.; Smaele, D. D. Org. Process Res. Dev. 2002, 6, 618.
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    • Dichloromethane is often the preferred solvent for epoxidations with manganese-salen complexes. Acetonitrile as solvent for the reaction has also been described. See Gurjar, M. K.; Sarma, B. V. N. B. S.; Rama Rao, A. V. Ind. J. Chem. 1997, 36B, 213.
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  • 49
    • 0348101338 scopus 로고    scopus 로고
    • note
    • The olefin 2, available as a solution in t-BuOH containing ∼2% of MTBE was used. If MTBE is present in greater than 10% v/v, the reaction stalls.
  • 50
    • 0346210198 scopus 로고    scopus 로고
    • note
    • The diol 5 is more soluble in EtOAc, but BuOAc affords a superior azeotropic removal of water during the subsequent concentration prior to crystallization. Lab experiments have demonstrated that when the water content of the rich organic was > 0.8% w/w, the diol crystallized in wet clumps which badly adhered to the reactor walls and agitator shaft.
  • 51
    • 0347471359 scopus 로고    scopus 로고
    • note
    • As shown by HPLC analysis, the diol was stable in this mixture for up to 17 h at 20-25°C.
  • 52
    • 0347471372 scopus 로고    scopus 로고
    • note
    • 4.
  • 53
    • 0346210191 scopus 로고    scopus 로고
    • note
    • The acid wash removes the chiral ligand. The acidic aqueous phase can then be basified with NaOH, and the ligand can be extracted into toluene. See ref 15.
  • 54
    • 0347471358 scopus 로고    scopus 로고
    • note
    • 4 or 5-10 M NaOH solution.
  • 55
    • 0346210190 scopus 로고    scopus 로고
    • note
    • If the reaction stalls, additional charges of trimethylorthoacetate and TMSCl can be made.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.