Tethered ansa-bridged titanium complexes immobilized on 3-mercaptopropyl-functionalized silica gel and their application for the hydrosilylation of imines
Enantioselective and diastereoselective catalysis of the Mukaiyama aldol reaction: ene mechanism in titanium-catalyzed aldol reactions of silyl enol ethers
Remarkable positive nonlinear effect in the enantioselective glyoxylate–ene reaction catalysed by a chiral titanium complex
作者:Masahiro Terada、Koichi Mikami、Takeshi Nakai
DOI:10.1039/c39900001623
日期:——
The enantioselective glyoxylate–enereaction catalysed by chiraltitaniumcomplex derived from partially resolved BINOL is found to exhibit a remarkable level of asymmetric amplification, wherein the optical yield of the product significantly exceeds the enantiomericpurity of the chiral auxiliary employed.
The active species of binaphthol-derived titanium catalyst 1, which is
used as an efficient catalyst for glyoxylate–ene reactions, is
primarily composed of a µ
3
-oxo (Ti
3
O) species,
for which the molecular sieves 4A employed in the catalyst preparation act
as a H
2
O donor.
二萘酚衍生钛催化剂 1 是乙醛烯反应的高效催化剂,其活性物种主要由 µ 3 - 氧(Ti 3 O)物种组成,催化剂制备过程中使用的分子筛 4A 可作为 H 2 O 给体。
Mikami, Koichi; Terada, Masahiro; Nakai, Takeshi, Journal of the American Chemical Society, 1990, vol. 112, # 10, p. 3949 - 3954
作者:Mikami, Koichi、Terada, Masahiro、Nakai, Takeshi
DOI:——
日期:——
Asymmetric glyoxylate-ene reaction catalyzed by chiral titanium complexes: a practical access to .alpha.-hydroxy esters in high enantiomeric purities