Add triethylamine (0.36 mL, 2.57 mmol) to a stirred solution of methyl (1S,3R)-3-[[tert-butyl(dimethyl)silyl]oxymethyl]-1-methyl-1,2,3,4-tetrahydroisoquinoline-5-carboxylate (500 mg, 1.29 mmol), (benzotriazol-1-yloxy)tripyrrolidinophosphonium hexafluorophosphate (1.02 g, 1.93 mmol) and 2-(6-chloro-2-fluoro-3-methoxy-phenyl)acetic acid (356 mg, 1.54 mmol) in dimethylformamide (6.4 mL). Stir at room temperature for 16 h. Add saturated aqueous ammonium chloride (60 mL). Extract with ethyl acetate (3×50 mL). Wash the combined organic layers with brine. Dry over magnesium sulfate, filter and concentrate under reduced pressure. Purify by flash chromatography to yield the title compound as an amorphous yellow solid (703 mg, 1.15 mmol): MS (m/z): 550.0 (M+1).
