Trifluoroacetic acid → 2-Amino-4-{1-[(benzyloxy)carbonyl]-3-piperidinyl}-6-(2-hydroxyphenyl)nicotinic acid

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Reaction Steps

To a solution of tert-butyl 2-amino-4-{1-[(benzyloxy)carbonyl]-3-piperidinyl}-6-{2-[(4-methoxybenzyl)oxy]phenyl}nicotinate (0.95 g, 1.67 mmol) in CH2Cl2 (10 mL) was added trifluoroacetic acid (10 mL), and the stirring was continued at room temperature overnight. The mixture was concentrated under reduced pressure. The residue was diluted with toluene, then concentrated under reduced pressure to remove excess of trifluoroacetic acid by azeotropic distillation to give 2-amino-4-{1-[(benzyloxy)carbonyl]-3-piperidinyl}-6-(2-hydroxyphenyl)nicotinic acid (1.1 g, yield; quant.).

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