Michael Addition−Elimination Reactions of Chiral Enolates with Ethyl 3-Halopropenoates
作者:Jorge Esteban、Anna M. Costa、Àlex Gómez、Jaume Vilarrasa
DOI:10.1021/ol702632m
日期:2008.1.1
macrolides amphidinolide E and dictyostatin have been prepared via a Michael addition (followed by elimination of X-) of chiral enolates on beta-halo derivatives of ethyl acrylate, with full retention of the initial E or Z configuration. Evans oxazolidin-2-ones and our related thiazolidin-2-ones, as well as a fine-tuning of the reaction conditions, have been essential. Many chiral building blocks are accessible
通过在丙烯酸乙酯的β-卤代衍生物上手性烯醇盐的迈克尔加成反应(随后消除X-),已经制备了细胞毒性大环内酯类两性化合物E和双香抑素的关键二烯或二烯亚结构,并完全保留了初始E或Z构型。埃文斯恶唑烷-2-酮和我们相关的噻唑烷-2-酮以及对反应条件的微调是必不可少的。从这些加合物可得到许多手性结构单元。