Selective decarboxylation of two alkylallylurethane isomers into alkylallylamines has been performed in a biphasic system by using randomly hydroxypropylated and methylated cyclodextrins as discriminating agents. Surprisingly, the presence of small organic hydrosoluble molecules such as amine or alcohol derivatives appeared to be crucial in the discriminating process. Indeed, it was clearly proved
通过使用无规羟丙基化和甲基化
环糊精作为区分剂,已经在双相体系中将两种烷基烯丙基
乙烷异构体选择性脱羧为烷基
烯丙基胺。出乎意料的是,在鉴别过程中,小的有机
水溶性分子如胺或醇衍
生物的存在似乎至关重要。实际上,已经清楚地证明了这些添加剂的存在大大提高了底物的选择性。例如,向反应介质中加入
三乙胺可使甲基化的β-
环糊精的鉴别能力提高7倍。考虑到三元
环糊精/底物/添加剂复合物的形成,可以解释这些出乎意料的结果。