Stereoselective synthesis of trifluoromethyl-substituted 1,2-diamines by aza-Michael reaction with trans-3,3,3-trifluoro-1-nitropropene

Title compounds are prepared by aza-Michael addition of optically pure 4-phenyl-2-oxazolidinone on 3,3,3-trifluoro-1-nitropropene through a multistep procedure with 53-60% overall yield and 92% de.