Magnesium Halide-Catalyzed Anti-Aldol Reactions of Chiral <i>N</i>-Acylthiazolidinethiones
作者:David A. Evans、C. Wade Downey、Jared T. Shaw、Jason S. Tedrow
DOI:10.1021/ol025553o
日期:2002.4.1
[reaction: see text] Diastereoselective direct aldol reactions of chiral N-acylthiazolidinethiones occur in high yield with preference for the illustrated anti diastereomer. This reaction is catalyzed by 10% MgBr2.OEt2 in the presence of triethylamine and chlorotrimethylsilane. Yields range from 56 to 93% with diastereoselectivity up to 19:1 for a variety of N-acylthiazolidinethiones and unsaturated
[反应:见正文]手性N-酰基噻唑烷硫酮的非对映选择性直接羟醛反应以高收率发生,优选图示的抗非对映异构体。在三乙胺和氯代三甲基硅烷的存在下,该反应由10%MgBr2.OEt2催化。对于各种N-酰基噻唑烷硫酮和不饱和醛,非对映选择性高达19:1,产率为56%至93%。