作者:William R. Esmieu、Stephen M. Worden、David Catterick、Claire Wilson、Christopher J. Hayes
DOI:10.1021/ol8010166
日期:2008.7.17
An enantioselective formal synthesis of the alkaloid (-)-cephalotaxine has been completed, using an alkylidene carbene 1,5-CH insertion reaction as a key step to construct the spiro[4.4]azanonane core D/E-ring system. A Heck-type cyclization was used to close the tetrahydroazepine C-ring and a selective epoxidation-rearrangement sequence was used to elaborate the E-ring.