Bi(cyclopentyl)diol-Derived Boronates in Highly Enantioselective Chiral Phosphoric Acid-Catalyzed Allylation, Propargylation, and Crotylation of Aldehydes
作者:Jinping Yuan、Pankaj Jain、Jon C. Antilla
DOI:10.1021/acs.joc.0c01646
日期:2020.10.16
catalytic addition of bi(cyclopentyl)diol-derived boronates to aldehydes promoted by chiralphosphoricacids, allowing for the formation of enantioenriched homoallylic, propargylic, and crotylic alcohols (up to >99% enantiomeric excess (ee), diastereomeric ratio (dr) >20:1). These boronate substrates provided superior enantioselectivities, allowing for the reactions to proceed with low catalyst loading
Brønsted Acid Catalyzed Asymmetric Propargylation of Aldehydes
作者:Pankaj Jain、Hao Wang、Kendall N. Houk、Jon C. Antilla
DOI:10.1002/anie.201107407
日期:2012.2.6
Which gets activated? A versatile and highly enantioselective chiral Brønstedacidcatalyzed method for the propargylation of aldehydes is described to provide a range of chiral homopropargylic alcohols. Computational studies support the belief that the chiral phosphoric acid activates the allenyl boronic acid pinacol ester reagent rather than the aldehyde.