5-(4-Trifluoromethoxy-phenyl)-nicotinic acid methyl ester → Methyl 5-(4-(trifluoromethoxy)phenyl)piperidine-3-carboxylate

Participants

Reaction Steps

14 g (45 mmol) of methyl 5-[4-(trifluoromethoxy)phenyl]pyridine-3-carboxylate in ethanol (500 ml) were admixed with 17 g of moistened palladium/carbon catalyst (10% palladium, 50% water), and then hydrogenated at 60° C. and a 50 bar hydrogen atmosphere overnight. The reaction solution was filtered, the filter residue was washed with ethanol and the filtrate was concentrated under reduced pressure. The residue was purified by means of column chromatography (silica gel, dichloromethane/methanol 600:1→10:1). Yield: 8 g (59% of theory)

Provenance & Evidence