Reactions of α,β-unsaturated esters with aldehydes were catalyzed by 0.2 equiv of lithium benzenethiolate in the presence of phenyl trimethylsilyl sulfide to afford the conjugate addition-aldol tandem reaction products in the anti stereoselectivity and good to high yields.
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