作者:Martin E. Kuehne、William G. Earley
DOI:10.1016/s0040-4020(01)88609-9
日期:1983.1
Condensation of methyl 1,2,3,4,5,6-hexahydroazepino[4,5-b]indole-5-carboxylate (5) with the ethylene ketal of 2-acetyl-5-chloropentanal, followed by reactions with triethylamine and aqueous acid gave minovincine 1a. Alternatively, a condensation of the indoloazepine hydrochloride 5a with the sodium enolate of formyl acetone, followed by acid cyclization, N-benzylation and reaction with base gave the
1,2,3,4,5,6-六氢az庚啶[4,5-b]吲哚-5-羧酸甲酯(5)与2-乙酰基-5-氯戊醛的乙烯缩酮缩合,然后与三乙胺和含水酸得到minovincine 1a。或者,将吲哚并ze庚因盐酸盐5a与甲酰丙酮的烯醇钠缩合,然后进行酸环化,N-苄基化并与碱反应,得到19-氧代糖苷类似物13。后者的热环化,氢解脱苄基,用1,3-溴氯丙烷烷基化和最终环化得到米诺霉素1a。该序列提供了反应性苏二碱类似物的分离和随后环化的第一个实例。