Synthesis of Saframycins. VIII. Synthesis of the ABC Ring of Safracins.
作者:Naoki SAITO、Yasuko OBARA、Masako AZUMAYA、Akinori KUBO
DOI:10.1248/cpb.40.2620
日期:——
An efficient synthesis of the 1, 5-imino-3-benzazocine derivative (18) from 1, 4-diacetyl-2, 5-piperazinedione (7) and 4-methoxy-3-methylbenzaldehyde (8) is described. The tricyclic lactam (18) is shown to be a useful intermediate for preparation of a phenol (5), which has the structure of the ABC ring system of safracins and ecteinascidins. This conversion is a promising route to total synthesis of (±)-safracin A (1a).
本研究描述了从 1,4-二乙酰基-2,5-哌嗪二酮(7)和 4-甲氧基-3-甲基苯甲醛(8)高效合成 1,5-亚氨基-3-苯并氮杂环辛衍生物(18)的过程。研究表明,三环内酰胺(18)是制备苯酚(5)的有用中间体,苯酚(5)具有黄樟素和表黄樟素的 ABC 环系统结构。这种转化是全合成 (±)-safracin A (1a) 的一条可行途径。