Highly Enantioselective Nitro-Mannich Reaction Catalyzed by <i>Cinchona</i> Alkaloids and <i>N</i>-Benzotriazole Derived Ammonium Salts

Abstract

The catalytic enantio- and diastereoselective nitro-Mannich reaction of α-amido sulfones in the mixed solvent of toluene/H(2)O has been realized using a phase-transfer catalyst (PTC) derived from cinchona alkaloids and N-benzotriazole. It performed well over a wide range of substrates to give the desired products in good yields (up to 94%) with excellent enantioselectivities (up to 99% ee) and diastereoselectivities (up to 99:1).