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(A) Model Povarov reaction co-catalyzed by o-nitrobenzenesulfonic acid and chiral ureas/thioureas. (B) Some of the chiral catalysts evaluated in optimization studies. (C) Results of catalyst structure-reactivity/enantioselectivity studies. d r = diastereomeric ratio. ee = enantiomeric excess. Both dr and ee were determined by supercritical fluid chromatography (SFC) analysis using commercially available chiral columns (Ref. 19).
