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Volumn 69, Issue 24, 2004, Pages 8387-8393

Highly stereoselective synthesis of functionalized β,β-di- and trisubstituted vinylic sulfoxides by cu-catalyzed conjugate addition of organozinc reagents

Author keywords

[No Author keywords available]

Indexed keywords

CATALYSTS; NEGATIVE IONS; SYNTHESIS (CHEMICAL);

EID: 9344226809     PISSN: 00223263     EISSN: None     Source Type: Journal    
DOI: 10.1021/jo048747l     Document Type: Article
Times cited : (25)

References (51)
  • 1
    • 0141508049 scopus 로고    scopus 로고
    • For reviews of sulfoxides, see: (a) Fernández, I.; Khiar, N. Chem. Rev. 2003, 103, 3651-3705.
    • (2003) Chem. Rev. , vol.103 , pp. 3651-3705
    • Fernández, I.1    Khiar, N.2
  • 17
    • 0035874722 scopus 로고    scopus 로고
    • For geometric selective synthesis of β,β-disubstituted vinylic sulfoxides, see: (a) Alonso, I.; Carretero, J. C. J. Org. Chem. 2001, 66, 4453-4456.
    • (2001) J. Org. Chem. , vol.66 , pp. 4453-4456
    • Alonso, I.1    Carretero, J.C.2
  • 26
    • 9344260067 scopus 로고    scopus 로고
    • note
    • The assignment of the olefin geometry was conducted by NOE experiment between the olefinic proton and the cis-substituent. High optical purity of 4a was confirmed by chiral HPLC (Daisel Chiralcel OB) in comparison with the racemic sample.
  • 32
    • 0001343434 scopus 로고
    • Posner and Okamura independently reported that α-sulfinyl vinyllithium generated by α-deprotonation of (Z)-vinylic sulfoxide immediately isomerizes to thermodynamically stable (E)-isomer (Posner, G. H.; Tang, P.-W.; Mallamo, J. P. Tetrahedron Lett. 1978, 3995-3998. Okamura, H.; Mitsuhira, Y.; Miura, M.; Takei, H. Chem. Lett. 1978, 517-520). In sharp contrast, no E/Z-isomerization was observed in α-sulfinyl vinylic carbanion generated by conjugate addition of organocopper reagents to 1-alkynyl sulfoxides (ref 4). The difference presumably arises from the ionic nature of the carbon-lithium bond as compared with the carbon-copper bond. With these facts in mind, we speculate that the organomagnesium intermediate in the reaction of Scheme 1 is geometrically more unstable due to its ionic nature than the corresponding organozinc intermediate in carbozincation, thereby suffering from E/Z-isomerization.
    • (1978) Tetrahedron Lett. , pp. 3995-3998
    • Posner, G.H.1    Tang, P.-W.2    Mallamo, J.P.3
  • 33
    • 0002637726 scopus 로고
    • Posner and Okamura independently reported that α-sulfinyl vinyllithium generated by α-deprotonation of (Z)-vinylic sulfoxide immediately isomerizes to thermodynamically stable (E)-isomer (Posner, G. H.; Tang, P.-W.; Mallamo, J. P. Tetrahedron Lett. 1978, 3995-3998. Okamura, H.; Mitsuhira, Y.; Miura, M.; Takei, H. Chem. Lett. 1978, 517-520). In sharp contrast, no E/Z-isomerization was observed in α-sulfinyl vinylic carbanion generated by conjugate addition of organocopper reagents to 1-alkynyl sulfoxides (ref 4). The difference presumably arises from the ionic nature of the carbon-lithium bond as compared with the carbon-copper bond. With these facts in mind, we speculate that the organomagnesium intermediate in the reaction of Scheme 1 is geometrically more unstable due to its ionic nature than the corresponding organozinc intermediate in carbozincation, thereby suffering from E/Z-isomerization.
    • (1978) Chem. Lett. , pp. 517-520
    • Okamura, H.1    Mitsuhira, Y.2    Miura, M.3    Takei, H.4
  • 44
    • 9344242157 scopus 로고    scopus 로고
    • note
    • The product 9f was a 1.8:1 mixture of two isomers, but the structures were not determined.
  • 46
    • 0004228992 scopus 로고
    • Taylor, R. J. K., Ed.; Harwood, L. M., Moody, C. J., Series Eds.; Oxford University Press: Oxford; Chapter 4
    • Knochel, P.; Rozema, M. J.; Tucker, C. E. In Organocopper Reagents: A Practical Approach; Taylor, R. J. K., Ed.; Harwood, L. M., Moody, C. J., Series Eds.; Oxford University Press: Oxford, 1994; Chapter 4, pp 85-104.
    • (1994) Organocopper Reagents: A Practical Approach , pp. 85-104
    • Knochel, P.1    Rozema, M.J.2    Tucker, C.E.3


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.