A Second Generation Formal Synthesis of (−)-Cephalotaxine
作者:Abdul Hameed、Alexander J. Blake、Christopher J. Hayes
DOI:10.1021/jo801540q
日期:2008.10.17
A second generation formal synthesis of the alkaloid (-)-cephalotaxine has been achieved using an alkylidene carbene 1,5-CH insertion reaction to establish a key quaternary stereocenter. The carbene precursor was readily derived from L-proline, and the 1,5-CH insertion reaction was performed under Ohira's conditions using lithiotrimethylsilyldiazomethane (LTDM), which gave the desired spirocyclic product