Reaction Steps
To N1-{(3aS,4S,6aR)-2-[3-(trifluoromethyl)benzyl]octahydrocyclopenta[c]pyrrol-4-yl}-L-leucinamide from Step A (80 mg, 0.184 mmol) in dichloromethane (0.5 mL) was added triethylamine (0.064 mL, 0.461 mmol) followed by cyclopropanesulfonyl chloride (38.9 mg, 0.277 mmol) in a solution of 300 μL dichloromethane and the reaction mixture was stirred at room temperature overnight. The reaction was reduced in volume and loaded onto a silica gel cartridge (Analogix®, Burlington, Wis., RS-12). The title compound was eluted with a gradient of 20% to 100% ethyl acetate/hexanes over 20 minutes to give N2-(cyclopropylsulfonyl)-N1-{(3aS,4S,6aR)-2-[3-(trifluoromethyl)benzyl]octahydrocyclopenta[c]pyrrol-4-yl}-L-leucinamide: 1H NMR (500 MHz, pyridine-d5) δ ppm 9.34 (d, J=9.0, 1H), 8.84 (d, J=6.8, 1H), 7.73 (s, 1H), 7.64 (d, J=7.5, 1H), 7.59 (d, J=12.3, 1H), 7.43 (dd, J=6.6, 14.3, 1H), 4.53-4.42 (m, 2H), 3.76 (d, J=13.2, 1H), 3.41 (d, J=13.2, 1H), 2.99 (qd, J=4.2, 8.0, 1H), 2.90 (dd, J=3.6, 9.5, 1H), 2.82-2.74 (m, 1H), 2.57-2.48 (m, 1H), 2.40 (dd, J=8.5, 19.8, 2H), 2.30 (dd, J=3.4, 9.2, 1H), 2.02 (td, J=6.5, 13.7, 1H), 1.94-1.85 (m, 2H), 1.85-1.78 (m, 1H), 1.71 (td, J=6.2, 11.6, 1H), 1.67-1.58 (m, 1H), 1.40-1.28 (m, 2H), 1.22 (dt, J=4.7, 10.8, 1H), 0.93 (ddd, J=6.6, 12.3, 14.0, 2H), 0.87 (d, J=6.5, 3H), 0.84 (d, J=6.7, 3H); MS (ESI+) m/z 502 (M+H)+.
