Triethylamine → methyl 3-((R)-1-(2-((R)-3-(2-ethoxyphenoxy)piperidin-1-yl)pyrimidine-5-carboxamido)ethyl)benzoate

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To a stirred solution of (R)-2-(3-(2-ethoxyphenoxy)piperidin-1-yl)pyrimidine-5-carboxylic acid (797 mg, 2.32 mmol) in dry DMF (2.5 mL) at 0° C. were added triethylamine (0.36 mL, 2.5 mmol), 1-hydroxybenzotriazole (470 mg, 3.48 mmol), and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (1666 mg, 3.48 mmol). The mixture was stirred for 5 min and methyl (R)-3-(1-aminoethyl)benzoate (500 mg, 2.32 mmol) was added. The reaction mixture was allowed to warm to 20-25° C. and was stirred for 16 hours. The mixture was poured into water (20 mL) and extracted with ethyl acetate (3 times with 25 mL). The combined organic layers were washed with brine, dried over Na2SO4, filtered and concentrated. The crude residue was purified via column chromatography to afford methyl 3-((R)-1-(2-((R)-3-(2-ethoxyphenoxy)piperidin-1-yl)pyrimidine-5-carboxamido)ethyl)benzoate (890 mg, 76%). MS (ES+) 505.2 (M+H).

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