A high level of stereoselection between 3,4-cis and 3,4-trans catechin-catechin condensation under intramolecular coupling method has been realized by changing the diester linker between the nucleophile and the electrophile. The azelaic acid linker gave exclusively 3,4-trans catechin-catechin dimer, whereas glutaric acid linker gave 3,4-cis catechin-catechin dimer as the sole product.
通过改变亲核体和亲电子体之间的二酯连接体,在分子内偶联法下实现了 3,4-顺式和 3,4-反式
儿茶素-
儿茶素缩合的高度立体选择性。
壬二酸连接体只产生 3,4-反式
儿茶素-
儿茶素二聚体,而
戊二酸连接体则只产生 3,4-顺式
儿茶素-
儿茶素二聚体。