On the two-ligand catalytic asymmetric deprotonation of N-Boc pyrrolidine: probing the effect of the stoichiometric ligand.

[摘要]：To map out the stoichiometric ligand requirements in the two-ligand catalytic asym. deprotonation of N-Boc pyrrolidine, 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.

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