Reaction Steps
In a 4 mL vial were combined (2S,4R)-tert-butyl 4-fluoro-2-((3aR,4S,6aS)-octahydrocyclopenta[c]pyrrol-4-ylcarbamoyl)pyrrolidine-1-carboxylate from Example 617 Step 2 (80 mg, 0.234 mmol), 2-bromo-4-(trifluoromethyl)pyridine (74.1 mg, 0.328 mmol), and triethylamine (0.131 mL, 0.937 mmol) in ethanol (0.1 mL). The reaction was heated at 82° C. for 1 day. To the reaction mixture was added 90% water/ethanol (1 mL), and then the liquid layer was decanted. This crude material was purified using a 12 g silica gel cartridge eluted with a gradient of 0-60% acetone/hexane over 20 minutes to give (2S,4R)-tert-butyl 4-fluoro-2-((3aR,4S,6aS)-2-(4-(trifluoromethyl)pyridin-2-yl)octahydrocyclopenta[c]pyrrol-4-ylcarbamoyl)pyrrolidine-1-carboxylate: 1H NMR (400 MHz, pyridine-d5, 90° C.) δ ppm 8.34 (d, J=5.2, 1H), 7.93 (bs, 1H), 6.73 (d, J=5.1, 1H), 6.60 (s, 1H), 5.33-5.10 (m, 1H), 4.62 (t, J=7.9, 1H), 4.34-4.22 (m, 1H), 3.96 (dd, J=21.9, 13.0, 1H), 3.66 (tdd, J=16.6, 12.2, 5.7, 3H), 3.57-3.50 (m, 1H), 3.30 (dd, J=10.9, 4.3, 1H), 2.76 (tdd, J=13.1, 8.5, 4.5, 2H), 2.54-2.35 (m, 2H), 2.16 (dd, J=12.5, 5.8, 1H), 2.04-1.91 (m, 1H), 1.72 (ddd, J=15.3, 12.9, 7.8, 1H), 1.51 (s, 9H), 1.44 (dd, J=9.2, 4.0, 1H); MS (ESI+) m/z 487 (M+H)+.
