Reaction Steps
To N2-methyl-N1-{(3aS,4R,6aR)-2-[3-(trifluoromethyl)benzyl]octahydrocyclopenta[c]pyrrol-4-yl}-L-leucinamide (38.9 mg, 0.095 mmol) from Example 166 in dichloromethane (0.5 mL) was added N,N-diisopropylethylamine (24.77 μL, 0.142 mmol) followed by pivaloyl chloride (12.79 μL, 0.104 mmol), and the resultant 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-4). The title compound was eluted with a gradient of 0% to 100% ethyl acetate/hexanes over 15 minutes: 1H NMR (500 MHz, pyridine-d5) δ ppm 7.81 (d, J=7.4, 1H), 7.74 (s, 1H), 7.60-7.55 (m, 2H), 7.43 (dd, J=6.6, 14.3, 1H), 5.45 (dd, J=7.0, 8.7, 1H), 4.35-4.29 (m, 1H), 3.57 (d, J=13.5, 1H), 3.44 (d, J=13.5, 1H), 3.13 (s, 3H), 2.73 (dd, J=2.6, 8.9, 1H), 2.53-2.45 (m, 1H), 2.41 (ddd, J=2.7, 8.3, 12.0, 1H), 2.37-2.32 (m, 1H), 2.29 (dd, J=3.0, 9.0, 1H), 2.26-2.21 (m, 1H), 2.05 (dq, J=6.0, 12.0, 1H), 1.86-1.80 (m, 3H), 1.55 (ddd, J=6.9, 12.8, 19.6, 2H), 1.41-1.31 (m, 1H), 1.30 (s, 9H), 0.88 (d, J=6.7, 3H), 0.82 (d, J=6.6, 3H); MS (ESI+) m/z 496 (M+H)+.
