A solution of 4-methyl-2-pyridin-2-yl-pyrimidine-5-carboxylic acid (685 mg, 3.18 mmol), HOTT (1.29 g, 3.48 mmol), and DIPEA (1.6 mL, 9.16 mmol) in DMF (15 mL) is stirred at rt under N2 for 10 min. 5-Fluoro-3,3-dimethyl-2,3-dihydro-indol-1-ylamine (542 mg, 3.01 mmol) is added. The resulting mixture is stirred at 80° C. overnight. The mixture is cooled and portioned between EtOAc and water. The organic phase is separated, washed with saturated aqueous NaHCO3, water and brine, dried (MgSO4), filtered and concentrated in vacuo. The residue is purified by silica gel chromatography eluting with 2% MeOH in DCM to afford 4-methyl-2-pyridin-2-yl-pyrimidine-5-carboxylic acid (5-fluoro-3,3-dimethyl-2,3-dihydro-indol-1-yl)-amide (585 mg, 52%) as a solid. MS: 378 (M+H). 1H NMR (300 MHz, DMSO-d6): δ 10.46 (s, 1H), 9.02 (s, 1H), 8.78 (d, 1H), 8.42 (d, 1H), 8.00 (dt, 1H), 7.56 (dd, 1H), 7.06 (dd, 1H), 6.92 (dt, 1H), 6.76-6.72 (m, 1H), 3.32 (s, 2H), 2.70 (s, 3H), 1.33 (s, 6H).
