To a solution of (R)-3-(4′-(2-(2-methylpyrrolidin-1-yl)ethyl)biphenyl-4-yl)propanoic acid (40 mg, 0.119 mmol), (S)-tert-butyl 2-aminopropanoate hydrochloride (25.8 mg, 0.142 mmol), and TEA (0.050 mL, 0.356 mmol) in tetrahydrofuran (1 mL) and acetonitrile (1 mL) was added HATU (54.1 mg, 0.142 mmol). The reaction was stirred at 60° C. for 2 h. The mixture was added 1M HCl (1 mL) and purified by HPLC to give the title compound. LCMS m/z=465.5 [M+H]+; 1H NMR (400 MHz, CD3CN) δ ppm 1.27 (d, J=6.7 Hz, 0.4H), 1.28 (d, J=7.2 Hz, 3H), 1.44 (s, 9H), 1.46 (d, J=6.6 Hz, 2.6H), 1.70-1.82 (m, 1H), 2.01-2.12 (m, 2H), 2.23-2.33 (m, 1H), 2.51 (t, J=7.8 Hz, 2H), 2.95 (t, J=7.7 Hz, 2H), 3.05-3.21 (m, 4H), 3.37-3.48 (m, 1H), 3.49-3.62 (m, 1H), 3.73-3.83 (m, 1H), 4.20-4.29 (m, 1H), 6.64 (d, 7.1 Hz, 1H), 7.34 (d, J=8.1 Hz, 2H), 7.39 (d, J=8.1 Hz, 2H), 7.58 (d, J=8.1 Hz, 2H), 7.63 (d, J=8.1 Hz, 2H).
