Helical Chiral 2,2′-Bipyridine N- Monoxides as Catalysts in the Enantioselective Propargylation of Aldehydes with Allenyltrichlorosilane
摘要:
A highly enantioselective synthesis of homopropargylic alcohols is achieved by using the new helical chiral 2,2'-bipyridine N-monoxide catalyst and allenyltrichlorosilane. This method can be further extended to the enantio- and regioselective propargylation of N-acylhydrazones.
Asymmetric Nozaki-Hiyama Propargylation of Aldehydes: Enhancement of Enantioselectivity by Cobalt Co-Catalysis
作者:Dmitry L. Usanov、Hisashi Yamamoto
DOI:10.1002/anie.201002751
日期:2010.10.25
It takes two to tango! A combination of partially reduced chiral H8‐TBOx chromium catalyst 1 and achiral cobalt porphine co‐catalyst 2 (Ar=p‐anisyl) led to an enhancement in enantioselectivity by suppression of the background process that presumably proceeds through an organomanganese species.
Helical Chiral 2,2′-Bipyridine <i>N-</i> Monoxides as Catalysts in the Enantioselective Propargylation of Aldehydes with Allenyltrichlorosilane
作者:Jinshui Chen、Burjor Captain、Norito Takenaka
DOI:10.1021/ol200102c
日期:2011.4.1
A highly enantioselective synthesis of homopropargylic alcohols is achieved by using the new helical chiral 2,2'-bipyridine N-monoxide catalyst and allenyltrichlorosilane. This method can be further extended to the enantio- and regioselective propargylation of N-acylhydrazones.