403. The reaction of enamines with electrophilic olefins. A synthesis of cyclobutanes
作者:Ian Fleming、John Harley-Mason
DOI:10.1039/jr9640002165
日期:——
Verfahren zur Herstellung von Butyrolactonen
申请人:BASF Aktiengesellschaft
公开号:EP0036131B1
公开(公告)日:1984-06-27
US4324727A
申请人:——
公开号:US4324727A
公开(公告)日:1982-04-13
Total Synthesis of (±)-Aspidospermidine
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.