A chiral scandium–bipyridine complex catalyzes the highly enantioselective addition of phenylselenol to aromatic meso-epoxides and furnishes 1,2-seleno alcohols in good yields and up to 94% ee. In addition, a sequential, one-pot epoxide opening-reduction protocol has been developed for the direct synthesis of 1,2-diaryl carbinols.
Enantioselective Ring-Opening Reaction of <i>m</i><i>eso-</i>Epoxides with ArSeH Catalyzed by Heterometallic Ti−Ga−Salen System
作者:Minghua Yang、Chengjian Zhu、Fang Yuan、Yijun Huang、Yi Pan
DOI:10.1021/ol0503034
日期:2005.5.1
[GRAPHICS]The first example of enantioselective ring-opening reaction of meso-epoxides with aryl selenols to give optically active beta-arylseleno alcohol in up to 97% ee was realized, using a chiral Ti-Ga-Salen heterometallic catalyst. A strong synergistic effect of different Lewis acids in the system was exhibited in the catalytic process.