作者:Matthew A. Toczko、Clayton H. Heathcock
DOI:10.1021/jo991599s
日期:2000.5.1
(+/-)-Aspidospermidine (1) has been synthesized from readily available methyl 3-ethyl-2-oxocylo-pentanecarboxylate (17) in 5.9% yield over 13 steps. The key step of the synthesis is an intramolecular cascade reaction that simultaneously forms the B, C, and D rings of 1. A high-yielding method of closing the remaining E ring is also described.
(+/-)-Asspidospermidine(1)是由易于获得的3-乙基-2-氧代羰基戊烷羧酸甲酯(17)在13个步骤中以5.9%的产率合成的。合成的关键步骤是分子内级联反应,该反应同时形成1个B,C和D环。还介绍了封闭其余E环的高产率方法。