Practical and Highly Selective Oxazolidinethione-Based Asymmetric Acetate Aldol Reactions with Aliphatic Aldehydes
作者:Nathan R. Guz、Andrew J. Phillips
DOI:10.1021/ol026108w
日期:2002.6.1
[reaction: see text] The utility of a valine-derived oxazolidinethione for auxiliary-based asymmetric acetate aldol reactions is reported. Titanium(IV) chloride, along with (-)-sparteine and N-methylpyrrolidinone, is employed for enolization. Subsequent aldol reaction with aliphatic aldehydes occurs with high diastereoselectivity (from 92:8 to 99:1 dr).
[反应:见正文]据报道,缬氨酸衍生的恶唑烷硫酮可用于基于辅助剂的不对称乙酸酯醛醇缩合反应。氯化钛(IV)与(-)-天冬氨酸和N-甲基吡咯烷酮一起用于烯醇化。随后发生的与脂肪醛的醛醇缩合反应具有非对映选择性高(从92:8到99:1 dr)。