TMSOTf-catalyzed intramolecular condensation for catechin and epicatechin units are described. A potential electrophile and a nucleophile were connected with diester linkers and TMSOTf-catalyzed condensation was examined. In comparison with intermolecular catechin and catechin condensation, the intramolecular condensation required high reaction temperature and reversed 3,4-cis product was obtained
描述了
儿茶素和
表儿茶素单元的TMSOTf催化的分子内缩合。潜在的亲电试剂和亲核试剂与二酯连接基连接,并检测了TMSOTf催化的缩合反应。与分子间
儿茶素和
儿茶素缩合相比,分子内缩合需要较高的反应温度并获得了反向的3,4-顺式产物。浓缩产物转化为天然的3,4-顺式(+)-
儿茶素-(4β→8)-(+)-
儿茶素二聚体。