London Dispersion Interactions Rather than Steric Hindrance Determine the Enantioselectivity of the Corey–Bakshi–Shibata Reduction
作者:Christian Eschmann、Lijuan Song、Peter R. Schreiner
DOI:10.1002/anie.202012760
日期:2021.2.23
experimental studies for a series of modified CBS catalysts equipped with dispersion energy donors (DEDs) in the catalysts and the substrates. Our results demonstrate that attractive LD interactions between the catalyst and the substrate, rather than steric repulsion, determine the selectivity. As a key outcome of our study, we were able to improve the catalystdesign for some challenging CBS reductions.
Enantioselective Alkylation of Aldehydes with Chiral Organomagnesium Amides (COMAs)
作者:Kelvin H. Yong、Nicholas J. Taylor、J. Michael Chong
DOI:10.1021/ol0258132
日期:2002.10.1
[GRAPHICS]Dialkylmagnesiums react with chiral secondary amines to form chiral organomagnesium amides (COMAs). These reagents alkylate aldehydes to form secondary alcohols with enantioselectivities up to 91:9 er.