Add time:08/20/2019         Source:sciencedirect.com

An approach to the synthesis of 3-substituted piperidines bearing partially fluorinated alkyl groups was proposed. The method was based on the DAST-mediated nucleophilic fluorination of easily available 2-bromopyridin-3-yl alcohols and ketones affording 2-bromo-3-(1-fluoroalkyl)pyridines and 2-bromo-3-(1,1-difluoroalkyl)pyridines, respectively, followed by catalytic hydrogenation. The hydrogenation step was studied with common heterogeneous Pd-, Pt-, and Rh-based catalyst. It was found that in the case of fluoroalkyl derivatives, the pyridine core reduction was accompanied by hydrodefluorination, which became a limitation of the strategy. Nevertheless, the method worked well with 1,1-difluoroalkyl derivatives

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