Biscinchona alkaloid catalysed Henry reaction of isatins: Enantioselective synthesis of 3-hydroxy-3-(nitromethyl)indolin-2-ones
2011
Abstract The direct catalytic enantioselective Henry (nitroaldol) reaction of isatins with nitromethane has been developed in the presence of a biscinchona alkaloid as a chiral organocatalyst. The resulting Henry adducts bearing C3-quaternary stereocentres were obtained in high yields (up to 94%) with high enantioselectivities (up to 97% ee).
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