Reaction Steps
To a suspension of (3-chloro-1H-indazol-5-yl)-[6-(1,2,3,6-tetrahydropyridin-4-yl)-7H-pyrrolo[2,3-d]pyrimidin-4-yl]-amine tris-hydrochloride (46.9 mg, 0.0967 mmol, 1 eq), 1-piperidinepropanoic acid (40.5 mg, 0.255 mmol, 2.6 eq), N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride (EDC) (56.2 mg, 0.293 mmol, 3 eq), and 1-hydroxybenzotriazole (HOBt) (13.9 mg, 0.103 mmol, 1 eq) in anhydrous DMF (5 mL), DiPEA (85 μL, 0.48 mmol, 5 eq) was added under an atmosphere of N2 The reaction was stirred at rt for 18 h, after which all solvent was evaporated under reduced pressure. The crude material was adsorbed onto Hydromatrix, dry loaded, and purified by chromatography on silica gel [Jones Flashmaster, 5 g/25 mL cartridge, eluting with MeOH:DCM 5%→7N NH3/MeOH:DCM 2%→5%→8%→15%]. Fractions 25-39 were combined and concentrated in vacuo, yielding the desired amide, but which contained a considerable amount of 1-(3-dimethylaminopropyl)-3-ethylurea. The yellow solid was triturated in hot MeOH/sonication, giving the title compound as an off-white solid. 1H NMR (400 MHz, CDCl3): δ=1.26 (s, br, 2H), 1.63 (m, 4H), 2.37-2.56 (m, 6H), 2.56-2.68 (m, 2H), 2.68-2.80 (m, 2H), 3.68 & 3.76 (t, J=5.6 Hz, rotamers, 2H), 4.22 & 4.25 (s, br, rotamers, 2H), 5.92 & 5.98 (s, rotamers, 1H), 6.18 & 6.22 (s, br, rotamers, 1H), 7.49 (d, J=8.8 Hz, 1H), 7.79 (dd, J=8.8, 1.6 Hz, 1H), 8.13 (s, 1H), 8.26 (s, 1H). MS (ES+): m/z 505.00/506.99 (27/10) [MH+]; m/z 407.96/409.98 (100/36) [MH+—C6H14N]. HPLC: tR=1.75 min (ZQ2000, polar—5 min).
