Cesium carbonate → 3-(4-methyl-3-morpholino-1H-pyrazolo[4,3-c]pyridin-6-yl)urea

Participants

Reaction Conditions

Reaction Steps

4-(6-Chloro-4-methyl-1-trityl-1H-pyrazolo[4,3-c]pyridin-3-yl)morpholine (75 mg, 0.152 mmol), 1-((1S,2R)-1-(4-fluorophenyl)-2-hydroxypropyl)urea, (48.2 mg, 0.227 mmol), BrettPhos palladacycle (12.10 mg, 0.015 mmol), cesium carbonate (128 mg, 0.394 mmol) 2-(dicyclohexylphosphino)3,6-dimethoxy-2′,4′,6′-triisopropyl-1,1′-biphenyl (8.13 mg, 0.015 mmol) were dissolved in dioxane (1 mL) and purged under agron for five minutes. The reaction mixture was heated to 90° C. and stirred for six hrs. The reaction mixture was filtered through celite, rinsed with methanol, and concentrated in vacuo. The crude residue was dissolved in TFA (1 mL) and triethylsilane (0.036 mL, 0.227 mmol) was added. The reaction mixture was stirred at rt for 30 min then diluted with DCM and concentrated in vacuo. The reaction mixture was diluted with DMF (1 mL), filtered, and purified by mass-triggered reverse-phase HPLC. Fractions containing pure compound were filtered through a PS-HCO3 cartridge and the filtrate was concentrated in vacuo to give 1-(1S,2R)-1-(4-fluorophenyl)-2-hydroxypropyl)-3-(4-methyl-3-morpholino-1H-pyrazolo[4,3-c]pyridin-6-yl)urea. MS ESI calc'd. For C21H26FN6O3 [M+H]+ 429. found 429. 1H NMR (ppm, 500 MHz, DMSO-d6) δ 12.17 (s, 1H), 9.11 (s, 1H), 7.31 (dd, J=5.6 Hz, 8.7 Hz, 2H), 7.12 (t, J=8.9 Hz, 2H), 7.06 (s, 1H), 4.91 (s, 1H), 4.69 (dd, J=4.2 Hz, 8.5 Hz, 1H), 3.90 (s, 1H), 3.77-3.73 (m, 5H), 3.08 (d, J=4.2 Hz, 4H), 2.68 (s, 3H), 0.93 (d, J=6.4 Hz, 3H).

Provenance & Evidence