Asymmetric reduction with L-proline amide derivatives of 1,4-dihydronicotinamide
Abstract
The magnesium perchlorate-, zinc chloride-, and cobalt chloride-catalysed asymmetric reduction of ethyl benzoylformate with 1,4-dihydronicotinamides carrying an L-proline amide in the 3-carbamoyl side-chain afforded R-mandelate, the asymmetric yields being greatly affected by the catalyst metal species (5–83%).