Stereoselective Conjugate Addition of an α-Sulfinyl Carbanion to α,β-Unsaturated Esters: Asymmetric Synthesis of Cycloalkanecarboxylates
作者:Takeshi Toru、Shuichi Nakamura、Hirofumi Takemoto、Yoshio Ueno
DOI:10.1055/s-1997-6144
日期:1997.6
The reaction of lithiated (R)-2-(trimethylsilyl)ethyl p-tolyl sulfoxide 1 with α,β-unsaturated esters gives 1,4-conjugate addition products as single stereoisomers, whereas the reaction of 1 with 4-, 6-, or 7-haloalkenoates affords cyclopropane-, cyclopentane- or cyclohexanecarboxylates, respectively, with high stereoselectivity.
石碳酸化的(R)-2-(三甲基硅基)乙基对甲苯亚砜 1 与δ、δ²-不饱和酯反应生成 1,4-共轭加成产物,为单一立体异构体,而 1 与 4-、6- 或 7-卤代烯酸盐反应则分别生成环丙烷、环戊烷或环己烷羧酸盐,具有很高的立体选择性。