3-[[3,5-Bis(trifluoromethyl)phenyl]amino]-4-[[(1R,2R)-2-(1-pyrrolidinyl)cyclohexyl]amino]-3-cyclobutene-1,2-dione, 98%, (99% ee)

Technical Notes:1. Michael Addition- An efficient diastereo- and enantioselective addition of a-substituted isocyanoacetates to N-aryI maleimides .References:1. Tetrahedron, 2013, 69, 10763-10771.