Reaction Steps
(Benzotriazol-1-yloxy)tris(dimethylamino)phosphonium hexafluorophosphate (239 mg, 0.416 mmol) was added to a solution of (6S)-2′-oxo-1′,2′,5,7-tetrahydrospiro[cyclopenta[b]pyridine-6,3′-pyrrolo[2,3-b]pyridine]-3-carboxylic acid (described in Intermediate 1) (140 mg, 0.499 mmol), (3S,5S,6R)-3-amino-5-(2-fluoro-3-methylphenyl)-6-methyl-1-(2,2,2-trifluoroethyl)piperidin-2-one hydrochloride (described in Intermediate 5) (147 mg, 0.416 mmol), and N,N-diisopropylethylamine (0.363 mL, 2.08 mmol) in DMF (4.0 mL), and the resulting mixture was stirred at 23° C. for 16 h. The reaction mixture was purified by reverse-phase HPLC, eluting with 5% acetonitrile in water (0.1% TFA used as a modifier) initially, grading to 95% acetonitrile in water. The desired fractions were partitioned between ethyl acetate and saturated aqueous sodium bicarbonate solution. The organic layer was washed with brine, dried over sodium sulfate and concentrated to give the title compound. HRMS: m/z=582.2134, calculated m/z=582.2123 for C30H28F4N5O3. 1H NMR (500 MHz, CDCl3) δ 8.90 (s, 1H), 8.34 (s, 1H), 8.17 (dd, 1H, J=5.4, 1.5 Hz), 8.05 (s, 1H), 7.27 (obscured m, 1H), 7.29 (t, 1H, J=7.3 Hz), 7.12 (dd, 1H, J=7.3, 1.5 Hz), 7.03 (t, 1H, J=7.8 Hz), 6.98 (t, 1H, J=6.8 Hz), 6.89 (dd, 1H, J=7.3, 5.1 Hz), 4.96-4.87 (m, 1H), 4.55 (dt, 1H, J=11.5, 5.8 Hz), 4.09 (p, 1H, J=5.8 Hz), 3.94 (dt, 1H, J=13.4, 3.2 Hz), 3.78 (d, 1H, J=17.3 Hz), 3.67 (d, J=16.4 Hz), 3.36-3.28 (m, 1H), 3.28 (d, 1H, J=17.3 Hz), 3.18 (d, 1H, J=16.4 Hz), 2.75 (m, 1H), 2.57 (q, 1H, J=12.5 Hz), 2.30 (s, 3H), 1.08 (d, 3H, J=6.6 Hz).
