Cesium carbonate → HCID 90408677, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of tert-butyl 2-methyl-3-(((trifluoromethyl)sulfonyl)oxy)-4,5-dihydro-2H-pyrazolo[3,4-c]pyridine-6(7H)-carboxylate (1.0 g, 2.60 mmol) in DMF (25 mL) was added pyridine-2-boronic acid pinacol ester (1.33 g, 6.49 mmol), cesium carbonate (3.42 g, 10.38 mmol), copper chloride (257 mg, 0.259 mmol), palladium acetate (29 mg, 0.130 mmol) and 1,1′-bis(diphenylphosphino)ferrocene (145 mg, 0.259 mmol). The reaction was stirred at 100° C. overnight under an atmosphere of N2. The reaction was poured into ice water and extracted with CH2Cl2 three times. The combined organic layers were dried over anhydrous MgSO4, filtered and evaporated. Chromatography on silica gel (0-100% ethyl acetatehexanes) provided the desired product (145 mg, 17%). MS (ESI) mass calcd. C17H22N4O2, 314.2. m/z found, 315.2 [M+H]+. 1H NMR (500 MHz, CDCl3) δ 8.73-8.70 (m, 0.5H), 7.80-7.76 (m, 0.5H), 7.40-7.35 (m, 2H), 7.31-7.24 (m, 1H), 4.66-4.44 (m, 2H), 4.07 (s, 2H), 3.84 (s, 1H), 3.70-3.56 (m, 2H), 2.73-2.55 (m, 2H), 1.54-1.42 (m, 9H).

Provenance & Evidence