Diastereo- and enantioselective nitro-Mannich reaction of α-substituted nitroacetates to N-phosphoryl imines catalyzed by cinchona alkaloid thiourea organocatalysts
The asymmetric nitro-Mannichreaction of N-phosphoryl imines with α-substitutednitroacetates was performed by using cinchona alkaloid thioureas as organocatalysts in toluene at −20 °C. The present method was highly tolerable to functionalized N-phosphoryl imines and provided a reliable synthetic route to obtain the corresponding β-nitro ethylphosphoramidates with adjacent quaternary and tertiary chiral