作者:P.L. Majumder、S. Joardar、B.N. Dinda、D. Bandyopadhyay、S. Joardar (Neé Saha)、A. Basu
DOI:10.1016/s0040-4020(01)92058-7
日期:1981.1
19-Epi-(+)-echitoveniline, a new indole alkaloid of the leaves ofAlstonia venenata R.Br., has been shown to possess the structure and absolute stereochemistry represented by 5b on the basis of spectral and chemical evidence. A mechanistic rationale for the dependence of the mode of LAH reduction of the δ-lactone 11 on its configuration at C-19 has been offered. The influence of the C-19 configuration
19-Epi-(+)-echitoveniline是一种新的Alstonia venenata R.Br.叶片的吲哚生物碱,在光谱和化学证据的基础上具有5b表示的结构和绝对立体化学。提供了一种机械原理,用于说明δ-内酯11的LAH还原方式依赖于其在C-19处的构型。讨论了C-19构型对19-芳氧基-(+)-和(-)-长春花碱生物碱中C-16碳甲氧基质子的化学位移值的影响。