Malononitrile → Tert-butyl 3-{2-amino-6-[2-(benzyloxy)phenyl]-3-cyano-4-pyridinyl}-1-piperidinecarboxylate

Participants

Reaction Conditions

Reaction Steps

A mixture of 2′-benzyloxyacetophenone (starting compound 1A) (10.00 g, 44.19 mmol), tert-butyl 3-formyl-1-piperidine carboxylate (starting compound 2B) (10.37 g, 44.61 mmol), malononitrile (3.21 g, 48.61 mmol), and ammonium acetate (17.03 g, 220.97 mmol) in toluene (50 mL) was stirred at 150° C. for 2 hrs. After cooled to room temperature, the reaction mixture was diluted with ethyl acetate. The organic phase was washed with water and saturated brine, dried over Na2SO4, filtered and concentrated. The residue was purified by column chromatography on silica gel (hexane/ethyl acetate=2/1). The purified compound (yellow oil) was recrystallized from ethanol to give tert-butyl 3- {2-amino-6-[2-(benzyloxy)phenyl]-3-cyano-4-pyridinyl}-1-piperidinecarboxylate as a white solid. (5.83 g, yield; 27%).

Provenance & Evidence