Stereoselective Preparation of α-Hydroxycarboxamide by Manganese Complex Catalyzed Hydration of α,β-Unsaturated Carboxamide with Molecular Oxygen and Phenylsilane
In the presence of a catalytic amount of bis(dipivaloylmethanato)manganese(III) complex, the α,β-unsaturated carboxylates with camphorsultam as a chiral auxiliary reacted with phenylsilane and dialkyl azodicarboxylates to afford the corresponding α-hydrazinated carboxylates with high stereoselectivities.