Total Synthesis of (.+-.)-Aspidofractinine and (.+-.)-Aspidospermidine
摘要:
Functional group manipulations on a previously constructed, easily accessible deethylaspidospermidine derivative have transformed the latter in few steps into a ring E diene, whose Diels-Alder reaction with phenyl vinyl sulfone and subsequent reductions has led to (+/-)-aspidofractinine. One-bond unraveling of a (phenylsulfonyl)aspidofractinine intermediate, followed by reductions, provided a second-generation pathway to (+/-)-aspidospermidine.