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。