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Enantioselective Synthesis of ABCF Tetracyclic Framework of Daphniphyllum Alkaloid Calyciphylline N.

Yunfei LiQiuyan DongQinxia XiePei TangMin ZhangYong Qin
Published in: Organic letters (2018)
Efforts toward the enantioselective synthesis of Daphniphyllum alkaloid calyciphylline N which leads to efficient preparation of the ABCF tetracyclic framework containing three bridgehead all-carbon quaternary stereocenters are described. This synthetic work features the utilization of an asymmetric conjugate addition to install the C5 all-carbon quaternary center, an efficient successive inter/intramolecular aldol sequence to build the critical bicyclo[2.2.2]octanone BC core, and a ring closing metathesis reaction followed by stereoselective Nagata conjugate cyanation to deliver the functionalized F ring.
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