[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%。