Syntheses of new dimeric-Cinchona alkaloid as a chiral phase transfer catalysts for the alkylation of Schiff base
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- 作者：Ayyanar Siva and Eagambaram Murugan
- 关键词：Enantioselection ; Dimeric catalyst ; Cinchona alkaloid ; Phase transfer catalyst ; Schiff base
- 刊名：Journal of Molecular Catalysis A: Chemical
- 出版年：2005
- 出版时间：2005
- 年：2005
- 卷：241
- 期：1-2
- 页码：111-117
- 全文大小：334 K
文摘
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.