Spiroborate esters in the borane-mediated asymmetric synthesis of pyridyl and related heterocyclic alcohols
作者:Viatcheslav Stepanenko、Melvin De Jesús、Wildeliz Correa、Irisbel Guzmán、Cindybeth Vázquez、Lymaris Ortiz、Margarita Ortiz-Marciales
DOI:10.1016/j.tetasy.2007.10.044
日期:2007.11
The effectiveness of several spiroborate ester catalysts was investigated in the asymmetric borane reduction of 2-, 3-, and 4-acetylpyriclines under different reaction conditions. Highly enantiomerically enriched 1-(2-, 3-, and 4-pyridyl)ethanols and 1-(heterocyclic)ethanols were obtained using 1-10% catalytic loads of the spiroborate 5 derived from diphenylprolinol and ethylene glycol. (c) 2007 Elsevier Ltd. All rights reserved.