3-[[3,5-Bis(trifluoromethyl)phenyl]amino]-4-[[(1S,2S)-2-(dimethylamino)cyclohexyl]amino]-3-cyclobutene-1,2-dione, 95%, (99% ee)

Technical Notes:
1. Michael/Alkylation Cascade Reaction: A rapid and efficient org anocatalytic cascade sequence for the
direct construction of spirocyclopenta ne bioxindoles has been carried out by using a chiral squaramide catalyst in the presence of a base.
References: 1.Chem. Eur. J., 2012, 18, 6737-6741.