Vinyl anion equivalent V. Asymmetric synthesis of allylic alcohols using chiral 2-(trialkylsilyl)ethyl sulfoxides
作者:Shinya Kusuda、Yoshio Ueno、Takeshi Toru
DOI:10.1016/s0040-4020(01)80816-4
日期:1994.1
Both enantiomers of optically pure secondary allylic alcohols can be conveniently prepared by the diastereoselective reaction of the α-sulfinyl carbanion of p-tolyl 2-(trialkylsilyl)ethyl sulfoxides or tert-butyl 2-(trimethylsilyl)ethyl sulfoxide with aldehydes followed by either fluoride-induced desilylsulfinylation or thermal elimination of the sulfinyl group.
Efficient synthesis of the fragment C9−C16 bearing the anti,syn stereotriad of ansamycin antibiotics is described. Key steps for controlling the configuration of the three stereogenic centers involve a stereoselective Reformatsky-type reaction followed by a diastereoselective reduction of a β-ketosulfoxide.
A click chemistry approach based on the reaction between alkynylflavins and mono(6-azido-6-deoxy)-β-cyclodextrin has proven to be a useful tool for the synthesis of flavin-cyclodextrin conjugates studied as monooxygenase mimics in enantioselective sulfoxidations.
A new system for catalytic asymmetric oxidation of sulfides using a hydrogen peroxide based reagent
作者:Philip C.Bulman Page、Jag P. Heer、Donald Bethell、Eric W. Collington、David M. Andrews
DOI:10.1016/0040-4039(94)88530-3
日期:1994.12
Catalyticasymmetricoxidation of sulfides is achieved in a remarkably simple process by treatment with hydrogenperoxide and an enantiomerically pure sulfonylimine under basic conditions.
Chemistry of oxaziridines. 17. N-(Phenylsulfonyl)(3,3-dichlorocamphoryl)oxaziridine: a highly efficient reagent for the asymmetric oxidation of sulfides to sulfoxides
作者:Franklin A. Davis、R. Thimma Reddy、Wei Han、Patrick J. Carroll
DOI:10.1021/ja00030a045
日期:1992.2
The synthesis, structure, and enantioselective oxidations of a new chiral N-sulfonyloxaziridine 12c [3,3-dichloro- 1,7,7-trimethyl-2'-(phenylsulfonyl)spiro[bicyclo[2.2.1]heptane-2,3'-oxaziridine]] are reported. This oxidant, which exhibits remarkably high and predictable ee's for the enantioselective oxidation of prochiral sulfides to sulfoxides, is prepared in three steps from (+)- or (-)-camphor