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.
Facile synthesis of trifluoromethyl carbinols and trifluoromethyl-α,β-unsaturated ketones from the new CF3CHO synthetic equivalent, 1,1-bis(dimethylamino)-2,2,2-trifluoroethane
作者:Yuelian Xu、William R. Dolbier
DOI:10.1016/s0040-4039(98)02106-6
日期:1998.12
1,1-Bis(dimethylamino)-2,2,2-trifluoroethane is an excellent synthetic building-block replacement for trifluoroacetaldehyde in condensation reactions with ketones using 36% aqueous HCl catalysis. Moderate to good yields (43–68%) of trifluoromethyl carbinols are obtained with symmetric and unsymmetric methyl ketones, with the latter undergoing reaction mainly at the methyl group. Its reactions with