Asymmetric Total Syntheses of (–)-Dihydromaritidine and (–)-Oxomaritidine.

A concise catalytic asymmetric approach to naturally occurring Amaryllidaceae alkaloids sharing a 5,10 b -ethanophenanthridine skeleton [(–)-oxomaritidine, (–)-dihydromaritidine, (–)-maritidine, and (–)- epi -maritidine] has been envisioned. The key intermediate in this strategy was obtained by a Pd(0)-catalyzed decarboxylative allylation of a 2-arylcyclohexan-1-one-derived allylenol carbonate (87%, 96% ee). [ABSTRACT FROM AUTHOR]