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
The ‘Mikami’-Catalyst in Enantioselective Diels–Alder Reactions of Juglone-Based Dienophiles with Different 1-Oxygenated Dienes: An Investigation on the Substitution Pattern Dependent Regioselectivity
作者:Jörg Pietruszka、Dietrich Böse、Wolfgang Frey
DOI:10.1055/s-0034-1378230
日期:——
investigating the substitution pattern depending regioselectivity of enantioselective BINOL-Ti-catalyzed Diels–Alderreactions of juglone-based dienophiles with 1-oxygenated dienes is reported. The different influences of residues both on the diene as well as on the dienophiles are investigated giving a detailed picture of their role on the regioselectivity. A mechanistic study investigating the substitution
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