tert-Butyl cyanoacetate → Tert-butyl 2-amino-4-{1-[(benzyloxy)carbonyl]-3-piperidinyl}-6-{2-[(4-methoxybenzyl)oxy]phenyl}nicotinate

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A solution of 1-{2-[(4-methoxybenzyl)oxy]phenyl}ethanone (14.2 g, 55.4 mmol)(starting compound 1D), benzyl 3-formyl-1-piperidinecarboxylate (13.7 g, 55.4 mmol)(starting compound 2C), tert-butyl cyanoacetate (7.8 g, 55.4 mmol), and ammonium acetate (9.8 g, 166.1 mmol) in 1,2-dimethoxyethane (60 mL) was stirred under reflux for 3.5 hrs. After cooled to room temperature, the mixture was partitioned between ethyl acetate and water. The separated organic phase was washed with water and brine, dried over MgSO4, filtered, and concentrated under reduced pressure. The residue was purified by column chromatography on silica gel (ethyl acetate:hexane, 1:2) to give tert-butyl 2-amino-4-{1-[(benzyloxy)carbonyl]-3-piperidinyl}-6-{2-[(4-methoxybenzyl)oxy]phenyl}nicotinate as a pale yellow oil (4.89 g, yield; 14%).

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