Enantiocontrolled Synthesis of (−)-9-<i>epi</i>-Pentazocine and (−)-Aphanorphine
作者:Xiaobao Yang、Hongbin Zhai、Zhong Li
DOI:10.1021/ol800737d
日期:2008.6.1
We have developed novel asymmetric routes to (-)-9- epi-pentazocine and (-)-aphanorphine from a d-tyrosine derivative. The tricyclic frameworks of (-)-9- epi-pentazocine and (-)-aphanorphine were assembled stereoselectively via intramolecular Friedel-Crafts reaction of the corresponding bicyclic precursors, generated with titanium-promoted enyne cyclization and indium-initiated atom-transfer radical