Asymmetric Aldol Reaction of Alkenyl Esters with α-Keto Esters Catalyzed by Chiral Tin Alkoxides
作者:Akira Yanagisawa、Chika Uchiyama、Kotaro Takagi
DOI:10.1055/a-1665-9014
日期:2021.12
A catalytic enantioselective aldol reaction of alkenyl esters with α-ketoesters was achieved by using an (R)-BINOL-derived chiral tin dibromide possessing 4-t-butylphenyl groups at the 3- and 3′-positions as a chiral precatalyst in the presence of sodium methoxide and methanol. Optically active aldol products possessing a chiral tertiary carbon were diastereoselectively obtained with up to 92% ee
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