Stereochemical Studies of Chiral Nonconjugated Carbanions. Asymmetric Alkylation of Aldehydes with Sulfur-Substituted Carbanions of Chiral α-(1,3-Dithian-2-yl) Acetals
作者:Hidenori Chikashita、Tsutomu Yuasa、Kazuyoshi Itoh
DOI:10.1246/cl.1992.1457
日期:1992.8
induction based on the nucleophilic addition of sulfur-substituted nonconjugated carbanions produced from a variety of chiral α-(1,3-dithian-2-yl) acetals to achiral aldehydes was studied. The reaction with the carbanion of the chiral acetal derived from (4R,5R)-3,6-diethyl-3,6-dimethoxy-4,5-octanediol showed the best stereoselectivity (ds = 2.4:1-6.3:1) producing a chiral secondary-alcohol center.
研究了一种基于硫取代的非共轭碳负离子亲核加成的新型不对称诱导,这些碳负离子是由各种手性 α-(1,3-二噻烷-2-基) 缩醛生成的非手性醛。与 (4R,5R)-3,6-二乙基-3,6-二甲氧基-4,5-辛二醇衍生的手性缩醛的碳负离子反应显示出最好的立体选择性(ds = 2.4:1-6.3:1),生成手性二级醇中心。