Diisopropylethylamine → 5-Amino-N-{4-[(3R,4S,5S)-3-amino-4-hydroxy-4,5-dimethylpiperidin-1-yl]-2,3-dihydrofuro[2,3-b]pyridin-5-yl}-2-(2,6-difluorophenyl)-1,3-thiazole-4-carboxamide

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Reaction Steps

To a mixture of 5-[(tert-butoxycarbonyl)amino]-2-(2,6-difluorophenyl)-1,3-thiazole-4-carboxylic acid (75 mg, 0.21 mmol), tert-butyl [(3R,4S,5S)-1-(5-amino-2,3-dihydrofuro[2,3-b]pyridin-4-yl)-4-hydroxy-4,5-dimethylpiperidin-3-yl]carbamate (62 mg, 0.16 mmol) and HATU (196 mg, 0.515 mmol) in DMF (2.0 mL), DIPEA (123 mg, 0.952 mmol) was added. The reaction mixture was stirred at room temperature for 3 h, and then concentrated under reduced pressure. DCM (2.0 mL) was added to the resulting residue followed by TFA (2.0 mL). The mixture was stirred at room temperature for 30 min., and then concentrated under reduced pressure. The resulting residue was purified using RP-HPLC (XBridge™ C18 column, eluting with a gradient of MeCN/water containing 0.1% NH4OH, at flow rate of 30 mL/min.) to afford the title compound as a white solid (25 mg, 29%). LCMS calc. for C24H27F2N6O3S (M+H)+: m/z=517.2. found 517.0. 1H NMR (500 MHz, DMSO-d6) δ 9.34 (s, 1H), 8.78 (s, 1H), 7.64-7.46 (m, 3H), 7.24 (t, J=8.6 Hz, 2H), 4.47 (t, J=9.1 Hz, 2H), 3.97 (s, 1H), 3.37 (t, J=8.5 Hz, 2H), 2.87-2.79 (m, 2H), 2.79-2.72 (m, 1H), 2.63 (dd, J=10.8, 4.6 Hz, 1H), 2.60-2.55 (m, 1H), 1.85-1.76 (m, 1H), 1.39 (br, 2H), 0.98 (s, 3H), 0.73 (d, J=6.8 Hz, 3H) ppm.

Provenance & Evidence