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High-value stereo-enriched 3- and 3,4-substituted piperidines and strategies for their synthesis. (a) Representative examples of biologically active chiral substituted piperidines. (b) Previous work: Asymmetric transition-metal-catalyzed synthesis of 3-substituted piperidines. (c) This work: Chemo-enzymatic dearomatization of pyridines for the synthesis of chiral 3- and 3,4-substituted piperidines.
