Z/E Selective Synthesis of β,β-Disubstituted and (Z)-β-Monosubstituted Baylis-Hillman Adducts<i>Via</i>Anionic Additions of Vinylcuprates to Aldehydes
作者:Han-Xun Wei、Steven Willis、Guigen Li
DOI:10.1080/00397919908086469
日期:1999.9
method has been developed for the synthesis of achiral β,β-disubstituted and (Z)-β-monosubstituted Baylis-Hillman adducts with excellent Z/E stereospecificity in some cases. The process involves the conjugate additions of R2CuLi or RMgBr-CuBr-DMS to α,β-acetylenic esters and followed by additions of anionic α-(alkoxycarbonyl)vinyl]copper intermediates to aldehydes. The individual Z- and E- isomers
摘要 开发了一种合成非手性 β,β-二取代和 (Z)-β-单取代 Baylis-Hillman 加合物的新方法,在某些情况下具有优异的 Z/E 立体特异性。该过程包括将 R2CuLi 或 RMgBr-CuBr-DMS 共轭添加到 α,β-炔酸酯,然后将阴离子 α-(烷氧基羰基)乙烯基] 铜中间体添加到醛中。所得β-支化α-(羟基烷基)丙烯酸酯的单独Z-和E-异构体可以通过柱色谱以中等至极好的产率分离。