Journal of Molecular Catalysis A-Chemical, Vol.241, No.1-2, 111-117, 2005
Syntheses of new dimeric-Cinchona alkaloid as a chiral phase transfer catalysts for the alkylation of Schiff base
New dimeric cinchona quaternary ammonium salts have been synthesized and used as efficient chiral phase transfer catalysts for enantioselective alkylation of N-(diphenylmethylene)glycine tert-butyl ester giving very good chemical yield and up to 99% enantiomeric excess. The catalytic efficiency was compared with the previously reported single site chiral phase transfer catalysts. (c) 2005 Elsevier B.V. All rights reserved.