Reaction Steps
(S)-2-Phenylbutanoic acid (41.7 mg, 0.254 mmol), 1-hydroxybenzotriazole (38.9 mg, 0.254 mmol), and N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide (0.045 mL, 0.254 mmol) were combined in dichloromethane (1 mL). The reaction was stirred at room temperature for 10 minutes, and then (3aS,4R,6aR)-2-benzyloctahydrocyclopenta[c]pyrrol-4-amine (50 mg, 0.231 mmol) from Step E was added in 0.5 mL of dichloromethane. The reaction was stirred at room temperature for 20 hours, and then quenched with 0.5 mL of water. The organic layer was separated. The crude material was chromatographed using a silica gel cartridge (Analogix®, Burlington, Wis., RS-4) eluting with 1-10% methanol(ammonia)/dichloromethane to give the title compound: 1H NMR (400 MHz, pyridine-d5) δ ppm 8.47 (d, J=7.0, 1H), 7.59 (m, 2H), 7.42 (d, J=7.1, 2H), 7.34 (dd, J=7.6, 16.5, 4H), 7.25 (dt, J=5.0, 10.1, 2H), 4.45-4.29 (m, 1H), 3.62-3.51 (m, 2H), 3.44 (d, J=13.2, 1H), 2.85 (dd, J=2.7, 9.0, 1H), 2.58-2.50 (m, 1H), 2.50-2.42 (m, 2H), 2.40-2.31 (m, 1H), 2.31-2.22 (m, 2H), 1.97 (dq, J=6.1, 12.1, 1H), 1.85 (td, J=6.9, 13.6, 1H), 1.74 (dt, J=6.4, 14.3, 1H), 1.46 (dt, J=7.1, 19.2, 1H), 1.31 (dt, J=6.2, 20.5, 1H), 0.96 (dd, J=5.5, 9.1, 3H); MS (ESI+) m/z 363 (M+H)+.
