Directing the Cation Recognition Ability of Calix[4]arenes toward Asymmetric Phase-Transfer Catalysis
作者:Nicola Alessandro De Simone、Rosaria Schettini、Carmen Talotta、Carmine Gaeta、Irene Izzo、Giorgio Della Sala、Placido Neri
DOI:10.1002/ejoc.201700912
日期:2017.10.10
the first time in asymmetric phase-transfercatalysis. The binding affinities of a series of chiral α-methylbenzylamine-derived calix[4]arene-amides toward Na+ guest have been determined by 1H NMR spectroscopic titration experiments. The good apparent association constant values are consistent with the macrocycles' catalytic efficiency in the asymmetric alkylation reaction of N-(diphenylmethylene)glycine