Highly enantioselective addition of ketones to nitroolefins catalyzed by new thiourea–amine bifunctional organocatalysts

Abstract
A new and effective organocatalytic system: primary amine derived chiral thiourea catalyst 4a and AcOH–H2O additive, which converts different ketones to γ-nitroketones in high yields (82–99%) and enantioselectivities (90–99%) has been described.