To a solution of (2S,4S)-4-[4-(6-amino-5-benzothiazol-2-ylpyridin-3-yl)-pyrazol-1-yl]-pyrrolidine-2-carboxylic acid (5.00 mg, 0.00969 mmol) in DMF (2 mL) at rt were added dimethylamine hydrochloride (20 mg, 0.25 mmol) and DIPEA (0.1 mL, 0.6 mmol), and the mixture was stirred for 1 min. TBTU (6.22 mg, 0.0194 mmol) was then added, and the solution was stirred for 10 min. The material was transferred to a separatory funnel. The organic layer was washed with water, and concentrated in vacuo. The material was loaded onto a prep TLC plate, eluting with 6% (7N NH3 in MeOH)/DCM. The band containing the product was collected and filtered off with 1:1 MeOH/DCM. The filtrate was concentrated in vacuo to afford the title compound as a yellow solid. 1H NMR (400 MHz, CD3OD): δ=2.15-2.21 (m, 1H), 2.82-2.91 (m, 1H), 3.00 (s, 3H), 3.12 (s, 3H), 3.23 (dd, J=12.4, 6.3 Hz, 1H), 3.49 (dd, J=12.0, 3.4 Hz, 1H), 4.15 (t, J=8.3 Hz, 1H), 4.98-5.05 (m, 1H), 7.42-7.47 (m, 1H), 7.53 (td, J=7.7, 1.3 Hz, 1H), 7.85 (s, 1H), 8.02 (dd, J=11.6, 7.8 Hz, 2H), 8.13 (s, 1H), 8.20 (d, J=2.3 Hz, 1H), 8.32 (d, J=2.0 Hz, 1H). MS (ES+): m/z=434.14 (100) [MH+]. HPLC: tR=2.12 min (ZQ2, polar—5 min).
