Diastereoselective Magnesium Halide-Catalyzed <i>anti</i>-Aldol Reactions of Chiral <i>N</i>-Acyloxazolidinones
作者:David A. Evans、Jason S. Tedrow、Jared T. Shaw、C. Wade Downey
DOI:10.1021/ja0119548
日期:2002.1.1
A chiral auxilliary-based direct aldol reaction is reported. The reactions are catalytic in magnesium salts and are facilitated by silylation with chlorotrimethylsilane. The adducts isolated are in high diastereoselectivity (up to 32:1 dr) and favor the anti-aldol diastereomer B. Reactions are operationally simple and can be run under ambient atmosphere without rigorous exclusion of water. Many of
报道了一种基于手性助剂的直接醛醇反应。该反应在镁盐中具有催化作用,并通过与三甲基氯硅烷的硅烷化作用促进。分离出的加合物具有高非对映选择性(高达 32:1 dr)并且有利于抗醛醇非对映异构体 B。反应操作简单,可以在环境气氛下进行,无需严格排除水。许多加合物是高度结晶的,无需色谱法即可分离单个非对映异构体。