Asymmetric michael additions of ester enolates to enantiomerically pure vinylic sulfoxides
作者:Gary H. Posner、Moshe Weitzberg、Terence G. Hamill、Edward Asirvatham、He Cun-heng、Jon Clardy
DOI:10.1016/s0040-4020(01)90581-2
日期:1986.1
donors to enantiomerically pure Michael acceptor cycloalkenone sulfoxides 1a and 1b and unsaturated lactone sulfoxides 3a and 3b. The level of asymmetric induction in some cases is extraordinarily high (95% e.e. of final 1,5-dicarbonyl products). Adduct ester lactones 5 and 6 can be converted easily into some synthetically versatile, trifunctional, 3-substituted glutarate esters of highenantiomeric purity
)-(+)-2-(-tolylsulfinyl)-2-buten-4-olide: an enantiomerically pure Michael acceptor for asymmetric synthesis of 3-substituted 4-butanolides. (—)-podorhizon.
作者:Gary H. Posner、Timothy P. Kogan、Stephen R. Haines、Leah L. Frye
DOI:10.1016/s0040-4039(01)81247-8
日期:1984.1
A short, reliable, and practical synthesis of ()-(+)-2-(-tolylsulfinyl)-2-buten-4-olide has been developed, and the utility of this Michael acceptor for highly enantiocontrolled synthesis of 3-substituted 4-butanolides has been demonstrated.
Short and Practical Syntheses of (S)-(+)-3-(p-Tolylsulfinyl)furan-2(5H)-one and (S)-(+)-3-(p-Tolylsulfinyl)-5,6-dihydropyran-2-one
作者:Francisco Yuste、José García Ruano、David Cruz Cruz、Angélica Hernández Linares、M. Martín
DOI:10.1055/s-0028-1088008
日期:2009.4
(S)-(+)-3-(p-Tolylsulfinyl)furan-2(5H)-one and (S)-(+)-3-(p-tolylsulfinyl)-5,6-dihydropyran-2-one can be synthesized by a new and significantly improved method consisting of Knoevenagel condensation of benzyl (R)-(+)-(p-tolylsulfinyl)acetate with the tert-butyldimethylsilyl derivatives of 2-hydroxyacetaldehyde or 3-hydroxypropanal, followed by subsequent reactions of the resulting mixtures with hydrogen