Aldol reaction of trichlorotitanium enolates. Revaluation of the boat transition state
作者:Eiichi Nakamura、Isao Kuwajima
DOI:10.1016/s0040-4039(00)86265-6
日期:1983.1
The trichlorotitanium enolates generally undergo an erythro selective aldolreaction except one case which gives a threo aldol. A new form of the boat transition state has been proposed.
Trichlorosilyl triflate, in the presence of a chiral Lewis base catalyst, provides an effective method for the enantioselective direct-type aldol reaction of aldehydes and ketones. A chiral Lewis base induces both the production and activation of trichlorosilyl enol ether, yielding an aldol product in good yield and with high diastereo- and enantioselectivities. (C) 2011 Elsevier Ltd. All rights reserved.
NAKAMURA, EIICHI;KUWAJIMA, ISAO, TETRAHEDRON LETT., 1983, 24, N 32, 3343-3346