To a suspension of benzothiazol-6-yl-[6-(1,2,3,6-tetrahydropyridin-4-yl)-7H-pyrrolo[2,3-d]pyrimidin-4-yl]-amine tris-hydrochloride (138.0 mg, 0.2984 mmol), 1-hydroxybenzotriazole (40.8 mg, 0.302 mmol), and PS-Carbodiimide (1.37 mmol/g loading; 873 mg, 1.20 mmol) in anhydrous N,N-dimethylformamide (10 mL), N,N-diisopropylethylamine (260 μL, 1.5 mmol) was added. A small amount of sonication was used to get majority of solid into solution. 2-(2-Methoxyethoxy)acetic acid (45.7 mg, 0.334 mmol) in anhydrous DMF (1 mL) was added, and the reaction was vigorously shaken at rt for 5.5 h. An additional 0.2 eq of 2-(2-methoxyethoxy)acetic acid (8.1 mg, 0.060 mmol) in anhydrous N,N-dimethylformamide (0.5 mL) was added (after 7 h), and the reaction was shaken overnight at rt. The resin was filtered off (M-size frit) and rinsed several times with DMF. The filtrate was concentrated in vacuo at medium temp (bath temp: max 43° C.), redissolved in MeOH and DCM, and concentrated again under reduced pressure. The crude material was adsorbed onto Hydromatrix, dry loaded, and purified by chromatography on silica gel [Jones Flashmaster, 10 g/70 mL cartridge, eluting with MeOH:DCM 2%→5%→10%]. Fractions containing product were combined and concentrated in vacuo, affording the title compound, as an off-white solid. The material was further purified by trituration in MeOH/sonication, affording the title compound, as an off-white solid. 1H NMR (400 MHz, DMSO-d6): δ=2.36-2.56 (s, br, rotamers, 2H), 3.19 (s, 3H), 2.38-2.45 (m, 2H), 3.49-3.55 (m, 2H), 3.58 & 3.64 (t, J=5.2 Hz, rotamers, 2H), 4.08 & 4.10 (s, br, rotamers, 2H), 4.14 & 4.18 (s, rotamers, 2H), 6.37 (s, br, 1H), 6.77 & 6.78 (s, rotamers, 1H), 7.80 (dd, J=8.8, 2.0 Hz, 1H), 7.97 (d, J=8.8 Hz, 1H), 8.28 (s, 1H), 8.85 (s, 1H), 9.17 (s, 1H), 9.54 (s, —NH), 11.95 (d, J=9.2 Hz, —NH). MS (ES+): m/z 465.01 (100) [MH+]. HPLC: tR=2.24 min (ZQ2000, polar—5 min).
