Transition-metal-catalyzed asymmetric organic synthesis via polymer-attached optically active phosphine ligands. 13, Asymmetric hydrogenation with polymer catalysts containing primary and chiral secondary pendant alcohols
Enantiopure poly(glycidyl methacrylate-co-ethylene glycol dimethacrylate): a new material for supported catalytic asymmetric hydrogen transfer reduction
dimethacrylate afforded crosslinked copolymer 1 in high yield. Opticallyactive polymers containing amino alcohol functionalities were then formed from 1 through epoxide ring opening with a number of achiral and homochiral amines. It was shown that ruthenium complexes based on these new polymeric amino alcohol ligands were effective catalysts for the asymmetric hydrogen transfer reduction of acetophenone.
Chiral polyamino alcohols and polyamino thiols for asymmetric heterogeneous catalysis
作者:Damien Hérault、Christine Saluzzo、Marc Lemaire
DOI:10.1016/j.tetasy.2006.06.041
日期:2006.8
A series of macroporous copolymer beads were synthesized by THE free radical suspension copolymerization of (S)-glycidylmethacrylate (GMA), (S)-thiiranylmethylmethacrylate (TMA), or (R,R)-phenylglycidylmethacrylate (Ph-GMA) with ethyleneglycol dimethacrylate (EDMA) or divinylbenzene (DVB). This allowed for the evaluation of their chemical and physical properties (polymer matrix nature or the structure of the heterocyclopropane) and their influence on the catalytic efficiency. These chiral polymers were subsequently transformed into polyamino alcohol or polyamino thiol derivatives by the facile ring opening of the oxirane or thiirane group with benzylamine and methylamine. Complexed with [RuCl2(P-cymene)](2), these derivatives were shown to be effective in the asymmetric hydrogen transfer reduction of acetophenone. The best results (conversion: 94%, ee: 71%) were obtained with benzylamine grafted onto poly(GMA-co-EDMA) (30/70 % wt/wt). (c) 2006 Published by Elsevier Ltd.
DESCHENAUX, R.;STILLE, J. K., J. ORG. CHEM., 1985, 50, N 13, 2299-2302
作者:DESCHENAUX, R.、STILLE, J. K.
DOI:——
日期:——
Transition-metal-catalyzed asymmetric organic synthesis via polymer-attached optically active phosphine ligands. 13, Asymmetric hydrogenation with polymer catalysts containing primary and chiral secondary pendant alcohols