Facile synthesis of α-trifluoromethylated alcohols from trifluoroacetaldehyde ethyl hemiacetal
作者:Toshio Kubota、Masahiro Iijima、Tatsuo Tanaka
DOI:10.1016/s0040-4039(00)91620-4
日期:1992.3
Trifluoroacetaldehyde ethylhemiacetal reacted with nucleophilic organosilanes such as cyanotrimethylsilane, allyltrimethylsilane, or enol trimethylsilyl ethers in the presence of Lewis acid to afford a series of α-trifluoromethylated alcohols in high yield.
The organocatalytic asymmetric direct aldol reaction of trifluoroacetaldehyde ethyl hemiacetal with aromatic methylketones in the presence of a catalytic amount of (S)-5-(pyrrolidin-2-yl)-1H-tetrazole in dichloroethane at 40 °C proceeds smoothly to produce (R)-4,4,4-trifluoro-1-aryl-3-hydroxy-1-butanones in high yields with up to 90% ee.