Total synthesis of two novel 5,6,7,8-tetrahydroindolizine alkaloids, polygonatines A and B
作者:Andrew Dinsmore、Karen Mandy、Joseph P. Michael
DOI:10.1039/b517573a
日期:——
polygonatines A and B, two simple but structurally novel alkaloids, have been substantiated by synthesis. Cyclisation of 4-(1H-pyrrol-1-yl)butanoic acid or its ethyl ester produced 6,7-dihydroindolizin-8(5H)-one , formylation of which at C-3 followed by reduction afforded polygonatine A . Acetylation of this alkaloid followed by displacement of the acetate with ethanol yielded polygonatine B , possibly via
多边形素A和B的结构是两个简单但结构新颖的生物碱,已通过合成得到证实。4-(1H-吡咯-1-基)丁酸或其乙酯的环化生成6,7-二氢吲哚嗪-8(5H)-one,在C-3对其进行甲酰化,然后还原得到多聚腺苷A。将该生物碱乙酰化,然后用乙醇置换乙酸酯,可能通过氮杂富烯鎓阳离子产生了多巴那汀B。