The catalytic and asymmetric nitro-Mannich reaction of nitro compounds to α-imino esters catalyzed by chiral bisoxazoline-copper complexes [Eq. (1); Pg = protecting group] gave β-nitro-α-amino esters with excellent diastereo- and enantioselectivities. The reactions can be performed under ambient conditions.
The First Catalytic Asymmetric Aza-Henry Reaction of Nitronates with Imines: A Novel Approach to Optically Active β-Nitro-α-Amino Acid- and α,β-Diamino Acid Derivatives
作者:Kristian Rahbek Knudsen、Tine Risgaard、Nagatoshi Nishiwaki、Kurt V. Gothelf、Karl Anker Jørgensen