Synthesis of vinca alkaloids and related compounds. Part 102: Simple synthesis and ring transformation of (±)-minovincine. First synthesis of (±)-vincaminine
作者:György Kalaus、László Léder、István Greiner、Mária Kajtár-Peredy、Károly Vékey、Lajos Szabó、Csaba Szántay
DOI:10.1016/s0040-4020(03)00902-5
日期:2003.7
A molecule with an indole skeleton, containing a latent acrylic ester function—acting as a diene—readily reacted with benzoic acid (4-bromomethylene-5-oxo)hexyl ester that had been built up from pentane-2,4-dione. Dehydration of the enamine and subsequent [4+2] cycloaddition supplied epimers having the d-secoaspidospermane skeleton. These compounds directly or after epimerization gave (±)-minovincine
具有吲哚骨架的分子具有潜在的丙烯酸酯功能(起二烯作用),该分子易于与由戊烷2,4-二酮建立的苯甲酸(4-溴亚甲基-5-氧代)己酯反应。烯胺的脱水和随后的[4 + 2]环加成反应提供了具有d-半胱氨酸高精链骨架的差向异构体。这些化合物直接或差向异构化后得到(±)-氨基长春新碱。(±)-氨基长春新碱在不同条件下的氧化环转化导致(±)-16-乙酰基-16-脱乙基阿波辛胺和(±)-长春新碱。