On the Two-Ligand Catalytic Asymmetric Deprotonation of <i>N</i>-Boc Pyrrolidine: Probing the Effect of the Stoichiometric Ligand
作者:Julia L. Bilke、Peter O’Brien
DOI:10.1021/jo8010655
日期:2008.8.1
To map out the stoichiometricligand requirements in the two-ligandcatalyticasymmetricdeprotonation of N-Bocpyrrolidine, 24 different ligands have been evaluated; the highest enantioselectivity (90:10 er) was obtained by using s-BuLi in the presence of 0.3 equiv of (−)-sparteine and 1.3 equiv of a cyclohexanediamine-derived ligand.