Stereoselective epoxidation of vinyl sulfones and N-( p-tolylsulfonyl)vinylsulfoximines derived from isopropylideneglyceraldehyde: synthesis of chiral building blocks
Effects of additional stereogenic centres and cation in the nucleophilic epoxidation of vinylsulfoximines with metal alkylperoxides
作者:Andrew D. Briggs、Richard F.W. Jackson、William Clegg、Mark R.J. Elsegood、Josephine Kelly、Paul A. Brown
DOI:10.1016/0040-4039(94)85048-8
日期:1994.9
Epoxidation of vinylsulfoximines using metalalkylperoxides proceeds with varying degrees of stereoselectivity, depending both on the metalcation and the steric bulk of the alkyl group. The stereochemical outcome of the epoxidation of substrates bearing an allylic asymmetric centre is also dependent on the epoxidising agent, and very high levels of stereoselectivity may be obtained in the formation
Briggs Andrew D., Jackson Richard F. W., Clegg William, Elsegood Mark R. +, Tetrahedron Lett, 35 (1994) N 37, S 6945-6948
作者:Briggs Andrew D., Jackson Richard F. W., Clegg William, Elsegood Mark R. +
DOI:——
日期:——
Stereoselective epoxidation of vinyl sulfones and N-( p-tolylsulfonyl)vinylsulfoximines derived from isopropylideneglyceraldehyde: synthesis of chiral building blocks
作者:Andrew D. Briggs、Richard F. W. Jackson、Paul A. Brown
DOI:10.1039/a807458e
日期:——
Epoxidation of N-(p-tolylsulfonyl)vinylsulfoximines using metal alkyl peroxides proceeds with varying degrees of stereoselectivity, depending both on the metal cation and the steric bulk of the alkyl peroxide group. The stereochemical outcome of the epoxidation of substrates bearing an allylic asymmetric centre is also dependent upon the epoxidising agent, and very high levels of stereoselectivity may be obtained in the formation of sulfonyloxirane 8a. This oxirane was subsequently converted into the sulfonyloxirane 15, a precursor to a useful chiral functionalised acyl anion equivalent. In addition, the optically pure α-bromothioester 20 was also prepared.