“On-water” synthesis of thioxoimidazolidinone-isatin/ninhydrin conjugates, followed by temperature-induced dehydration by a ZnMnO 3 @Ni(OH) 2 nano-catalyst

Temperature-driven C–C, C–N, and CC bond development yields 3-hydroxy-3-(3-methyl-5-oxo-2-thioxoimidazolidin-4-yl)oxindoles and (Z)-3-(3-methyl-5-oxo-2-thioxoimidazolidin-4-ylidene)indolin-2-one in a one-pot green "on water" synthesis.