Total synthesis of asperlicin C, circumdatin F, demethylbenzomalvin A, demethoxycircumdatin H, sclerotigenin, and other fused quinazolinones
作者:Ming-Chung Tseng、Huei-Yun Yang、Yen-Ho Chu
DOI:10.1039/b910545j
日期:——
Using scandium triflate and microwaves, the direct double dehydrocyclization of anthranilate-containing tripeptides was achieved, affording the total syntheses of (i) quinazolino[3,2-a]benzodiazepinediones (1a–f), (ii) diazepino[2,1-b]quinazolinediones (2a–e), and (iii) pyrazino[2,1-b]quinazolinediones (3a–e) with good overall isolated yields (23–43%, 37–47% and 31–56%, respectively). Among the quinazolino[3,2-a]benzodiazepinediones synthesized, 1a (sclerotigenin), 1b (circumdatin F), and 1f (asperlicin C) are natural products.
使用氟化铈和微波,成功实现了含有氨基苯甲酸的三肽的直接双脱氢环化,获得了以下化合物的整体合成:(i)喹唑啉[3,2-a]苯二氮杂杂环二酮(1a-f),(ii)二氮杂氟[2,1-b]喹唑啉二酮(2a-e),以及(iii)吡嗪[2,1-b]喹唑啉二酮(3a-e),它们的整体分离产率分别为23-43%,37-47%和31-56%。在合成的喹唑啉[3,2-a]苯二氮杂杂环二酮中,1a(紫锈碱)、1b(环夭碱F)和1f(曲霉素C)是天然产物。