A General and Expeditious One-Pot Synthesis of Sulfoxides in High Optical Purity from Norephedrine-Derived Sulfamidites
作者:José L. García Ruano、Carlos Alemparte、M. Teresa Aranda、María M. Zarzuelo
DOI:10.1021/ol027232i
日期:2003.1.1
A general and simple procedure for preparing any kind of enantiomerically enriched sulfoxide starting from norephedrine-derived N-benzyloxycarbonylsulfamidite 3a is reported. After one-pot reaction of 3a with RMgX, HBF(4), and R'MgX, a variety of sulfoxides 6 are obtained in ee usually higher than 93% and isolated yields ranging between 50 and 78%. The obtained configuration is tunable by simply electing
Enantioselective Additive Pummerer-Type Reaction in Chiral, Non-racemic Vinyl Sulfoxides Induced by O-Silylated Ketene Acetal.
作者:Norio SHIBATA、Chino FUJIMORI、Shigekazu FUJITA、Yasuyuki KITA
DOI:10.1248/cpb.44.892
日期:——
Treatment of chiral, non-racemic vinyl sulfoxides with O-silylated ketene acetal in the presence of a catalytic amount of zinc chloride in tetrahydrofuran resulted in an enantioselective Pummerer-type reaction, affording a considerable yield of the corresponding enantiomerically enriched methyl 4-siloxy-4-sulfenylbutyrate in 78-82% ee.
在四氢呋喃中催化量的氯化锌存在下,用 O-甲硅烷基化烯酮乙缩醛处理手性非外消旋乙烯基亚砜,产生对映选择性 Pummerer 型反应,得到相当大的产率的相应对映体富集的甲基 4-甲硅烷氧基- 78-82% ee 的 4-硫基丁酸酯。