Aza-Michael Addition, alpha,beta-unsaturated ketones, indolines, 3-[(3,5-Dimethylphenyl)amino]-4-[[(8α,9S)-6′-methoxycinchonan-9-yl]amino]-3-cyclobutene-1,2-dione, Quinine Derivative

Bifunctional cinchona alkaloid-squaramide-catalyzed highly enantioselective aza-Michael addition of indolines to α,β-unsaturated ketones.