Diisopropylethylamine → HCID 90410567, compound

Participants

Reaction Steps

To a solution of 4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridine (1.01 g, 5.15 mmol) in DMF (17 mL) was added 2-chloro-3-(trifluoromethyl)benzoic acid (2.31 g, 10.30 mmol), Hunig's base (3.55 mL, 20.60 mmol) and HATU (2.31 g, 10.30 mmol). The solution was allowed to stir for 30 min at rt then poured into ice water (300 mL). The resulting solid was collected by suction filtration and allowed to air dry. The solid was purified by chromatography on silica gel (0-100% ethyl acetatehexanes). The product fractions were concentrated to a white solid which was dissolved in ethanol (20 mL) and 1M NaOH (20 mL) and stirred at 80° C. for 1 h. Water (50 mL) and CH2Cl2 (50 mL) were added. The layers were separated and the water layer was extracted two times with CH2Cl2. The organic layers were combined, dried over anhydrous MgSO4, filtered and concentrated to an oil (1.37 g, 81%). MS (ESI) mass calcd. C14H11ClF3N3O, 329.1. m/z found, 330.1 [M+H]+. 1H NMR (500 MHz, CDCl3) δ 7.79-7.73 (m, 1H), 7.52-7.41 (m, 2H), 7.37 (br s, 1H), 5.11 (d, J=16.6 Hz, 0.5H), 4.85 (d, J=16.6 Hz, 0.5H), 4.46 (d, J=15.9 Hz, 0.5H), 4.36 (d, J=15.9 Hz, 0.5H), 4.22-4.18 (m, 0.5H), 3.94-3.88 (m, 0.5H), 3.49-3.44 (m, 1H), 2.85-2.80 (m, 1H), 2.75-2.65 (m, 1H), 2.62-2.54 (m, 1H).

Provenance & Evidence