A New Efficient Chiral Catalyst System. Combined Use of Tin(II) Oxide, Trimethylsilyl Triflate and Chiral Diamine in the Asymmetric Aldol Reaction
作者:Teruaki Mukaiyama、Hiromi Uchiro、Shu Kobayashi
DOI:10.1246/cl.1990.1147
日期:1990.7
The asymmetric aldol reaction between both achiral silyl enol ethers of thioesters and aldehydes is efficiently catalyzed by the use of a new catalyst system consisted of tin(II) oxide, trimethylsilyl triflate and a chiral diamine, to give the corresponding adducts in high yields with high diastereo- and enantioselectivities.
α,β-unsaturated ones are performed in propionitrile (solvent) by the use of a catalytic amount of chiral tin(II) Lewisacid consisting of tin(II) triflate and a chiral diamine. The asymmetric environments created by the chiral catalysts in the enantioselective aldol reaction are discussed by employing five kinds of chiral diamines.
A Novel Chiral Catalyst System, Tin(II) Triflate, a Chiral Diamine, and Tin(II) Oxide, in Asymmetric Aldol Reactions
作者:Shu Kobayashi、Takashi Kawasuji、Nobuaki Mori
DOI:10.1246/cl.1994.217
日期:1994.2
In the presence of a novel chiral catalyst system consisting of tin(II) triflate, a chiral diamine, and tin(II) oxide, highly enantioselective aldol reactions of the silyl enol ether of S-ethyl ethanethioate or S-ethyl propanethioate with aldehydes proceeded smoothly to afford the aldol adducts in high yields.