Asymmetric Aldol Reaction of Ketones with Alkenyl Trichloroacetates Catalyzed by Dibutyltin Dimethoxide and BINAP⋅Silver(I) Complex: Construction of a Chiral Tertiary Carbon Center
作者:Akira Yanagisawa、Yuuki Terajima、Kazuma Sugita、Kazuhiro Yoshida
DOI:10.1002/adsc.200900437
日期:2009.8
The reaction was found to be remarkably accelerated by the addition of a catalytic amount of a bidentate phosphine⋅silver(I) complex. Use of the BINAP⋅silver triflate (AgOTf) complex as the chiral co-catalyst resulted in the formation of optically active aldol products possessing a chiral tertiary carbon with up to 93% ee. This catalytic method was further applied to the asymmetric reaction of diketene
以二甲基二丁基锡为催化剂,实现了三氯乙酸烯基酯与α-酮酸酯的新型羟醛反应。发现通过加入催化量的双齿膦膦·银(I)配合物,反应显着加速。BINAP·三氟甲磺酸银(AgOTf)配合物作为手性助催化剂的使用导致形成了具有手性叔碳且ee高达93%的旋光性醇醛产品。将该催化方法进一步应用于双烯酮与苯甲酰基甲酸甲酯的不对称反应。