[EN] PIPERAZINE DERIVATIVE, PREPARATION METHOD THEREFOR AND USE THEREOF [FR] DÉRIVÉ DE PIPÉRAZINE, SON PROCÉDÉ DE PRÉPARATION ET SON UTILISATION [ZH] 哌嗪类衍生物及其制备方法和用途
[EN] PIPERAZINE DERIVATIVE, PREPARATION METHOD THEREFOR AND USE THEREOF [FR] DÉRIVÉ DE PIPÉRAZINE, SON PROCÉDÉ DE PRÉPARATION ET SON UTILISATION [ZH] 哌嗪类衍生物及其制备方法和用途
Recoverable Dendritic Phase-Transfer Catalysts that Contain (+)-Cinchonine-Derived Ammonium Salts
作者:Jordi Rull、José Juan Jara、Rosa M. Sebastián、Adelina Vallribera、Carmen Nájera、Jean-Pierre Majoral、Anne-Marie Caminade
DOI:10.1002/cctc.201600283
日期:2016.6.21
The asymmetric alkylation of a glycinate Schiff base with benzyl bromide is used as a benchmark reaction, and the dendrimeric catalyst that contains an allyl group on the O‐9 hydroxy group of the cinchonine units is the most active. The recovery and reuse of the catalyst are possible for five consecutive runs without loss of activity and with only a slight decrease in enantioselectivity. If other electrophiles