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Synthesis of α-chlorocarboxylic acids and derivatives

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Asymmetric hydration of α,α-dichloro aldehydes and α-halo enals via a NHC-catalyzed redox process gives enantioenriched α-chloro and α-fluoro carboxylic acids. The reaction allows the installation of an α-deuterium to give α-deutero α-halo acids using D2O as the deuteron source.
H. U. Vora, T. Rovis, J. Am. Chem. Soc., 2010, 132, 2860-2861.