Asymmetric hydrogenation of α-ethylstyrenes catalyzed by chiral ruthenium complexes
作者:Grant S Forman、Takeshi Ohkuma、William P Hems、Ryoji Noyori
DOI:10.1016/s0040-4039(00)01613-0
日期:2000.12
A combined system of RuCl2[(R,R)-Me-DuPhos](dmf)n and t-C4H9OK catalyzes the asymmetrichydrogenation of α-ethylstyrene derivatives. The reaction proceeds with a substrate to catalyst molar ratio of up to 2600 in 2-propanol at 8 atm and room temperature to give the chiral saturated products in 81–89% ee.
RuCl 2 [(R,R)-Me-DuPhos](dmf)n和t -C 4 H 9 OK的组合系统催化α-乙基苯乙烯衍生物的不对称氢化。反应在8 atm和室温下在2-丙醇中的底物与催化剂的摩尔比最高为2600,得到的手性饱和产物为ee的81-89%。
Iridium-Catalyzed Enantioselective Hydrogenation of Terminal Alkenes
作者:Steven McIntyre、Esther Hörmann、Frederik Menges、Sebastian P. Smidt、Andreas Pfaltz
DOI:10.1002/adsc.200404256
日期:2005.2
substituted 2-arylalkenes. Among six iridiumcomplexes that were tested, the most selectivecatalyst was a complex with a phosphinite-oxazoline ligand derived from threonine (Ir-ThrePHOX). In contrast to the hydrogenation of trisubstituted alkenes, a strong pressure effect was observed for this class of substrates. Lowering the hydrogen pressure from 50 to 1 bar resulted in a strong increase of the ee values