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.
cyclizations of bis(anthranilate)-containing tripeptide precursors to afford the total syntheses of 7-substituted quinazolino[3,2-a][1,4]benzodiazepinediones (1a-f), including natural products circumdatinF (1a), sclerotigenin (1b), and asperlicin C (1c), were achieved with good overall isolated yields (23-62%).