Reaction Steps
(2S)-2-(1,1-Dioxidoisothiazolidin-2-yl)-4-methylpentanoic acid (359 mg, 1.526 mmol) was combined with triethylamine (0.387 mL, 2.77 mmol) in dichloromethane (10 mL). 1-Hydroxybenzotriazole (234 mg, 1.526 mmol) and N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide (0.270 mL, 1.526 mmol) were added, and the reaction mixture was stirred for 15 minutes. Then (3aS,4R,6aR)-2-benzyloctahydrocyclopenta[c]pyrrol-4-amine (300 mg, 1.387 mmol) from Example 16 Step E was added, and the reaction mixture was stirred at room temperature for 24 hours. The reaction was quenched with 10 mL of aqueous sodium bicarbonate and extracted with 3×20 mL of dichloromethane. The solvent was removed in vacuo. The crude material was applied to a silica gel cartridge (Analogix®, Burlington, Wis., RS15-24) and eluted with 1-10% methanol (2 N ammonia)/dichloromethane to give the title compound: 1H NMR (500 MHz, pyridine-d5) δ ppm 8.76 (d, J=6.9, 1H), 7.46-7.39 (m, 2H), 7.40-7.33 (m, 2H), 7.26 (dd, J=9.9, 17.2, 1H), 4.52 (t, J=7.7, 1H), 4.44-4.34 (m, 1H), 3.93 (dt, J=7.0, 14.5, 1H), 3.57 (dd, J=5.4, 13.1, 1H), 3.49-3.36 (m, 2H), 3.30-3.20 (m, 2H), 2.83-2.74 (m, 1H), 2.62-2.45 (m, 2H), 2.44-2.37 (m, 1H), 2.33-2.17 (m, 4H), 2.11 (qd, J=6.5, 12.5, 1H), 1.92-1.78 (m, 3H), 1.77-1.59 (m, 2H), 1.45-1.32 (m, 1H), 0.88 (d, J=6.6, 3H), 0.83 (dd, J=2.5, 6.5, 3H); MS (ESI+) m/z 434 (M+H)+.
