Highly enantioselective metallation-substitution alpha to a chiral nitrile

Chem Sci. 2017 Feb 1;8(2):1436-1441. doi: 10.1039/c6sc03712g. Epub 2016 Oct 25.

Abstract

We report the deprotonation of a chiral nitrile and reaction of the resulting chiral organometallic species with a variety of electrophiles to give highly enantiomerically enriched 2-substituted nitrile products. The nitrile was treated with TMPMgCl and the resulting anion, an asymmetric alpha cyano Grignard species, was found to be configurationally stable at low temperature for a short time (half-life several minutes at -104 °C).