Catalytic composition and process for asymmetric hydrogenation

Details Catalytic composition and process for asymmetric hydrogenation Catalytic composition and process for asymmetric hydrogenation

B - Operations, Transporting

01

J

B01J 31/24 (2006.01) C07C 67/31 (2006.01) C07C 231/18 (2006.01) C07F 15/00 (2006.01)

Patent

CA 2526497

The present invention concerns a catalytic composition comprising a catalyst effective for catalysing asymmetric hydrogenation reactions, which catalyst requires acid activation, an acidic material effective for activating the catalyst, and a buffering compound or composition capable of forming, in the presence of the acidic material, an acetal, a ketal, a hemiacetal, and/or a hemiketal. The invention also relates to an asymmetric hydrogenation process utilising such a catalytic composition, and to the use of such a catalytic composition for improving the enantiomeric excess of a desired asymmetrically hydrogenated product.

L'invention concerne une composition catalytique comprenant un catalyseur efficace destiné à catalyser des réactions d'hydrogénation asymétrique, ce catalyseur nécessitant une activation acide, un matériau acide efficace en vue d'activer le catalyseur, et un composé tampon ou une composition capable de former, en présence du matériau acide, un acétal, un cétal, un hémiacétal, et/ou un hémicétal. L'invention concerne également un procédé d'hydrogénation asymétrique utilisant une telle composition, et l'utilisation de cette composition catalytique en vue d'améliorer l'excès énantiomérique d'un produit hydrogéné de façon asymétrique choisi.

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