Acetic Acid → HCID 178484278, compound

Participants

Reaction Steps

To a stirred solution of 2-([[3-(4-fluorophenyl)-1H-pyrazol-4-yl]methyl](methyl)amino)acetaldehyde (200 mg, 0.81 mmol, 1.00 equiv), methylamine hydrochloride (1 g, 14.81 mmol, 18.31 equiv) and acetic acid (126 mg, 2.10 mmol, 2.59 equiv) in 1,2-dichloroethane (20 mL) was added NaBH(OAc)3 (670 mg). The resulting solution was stirred at room temperature overnight and then quenched by the addition of 10 mL of water. The pH value of the solution was adjusted to 7 with saturated sodium carbonate solution. The resulting mixture was extracted with 2×50 mL of dichloromethane. The combined organic layers was dried over anhydrous sodium sulfate and concentrated under vacuum. The residue was initially purified on a silica gel column eluted with 10% MeOH in CH2Cl2 and the partially purified product was repurified by Prep-HPLC with the following conditions (1#-Pre-HPLC-005(Waters)): Column, XBridge Shield RP18 OBD Column, 5 μm, 19×150 mm; Mobile Phase, Water with 10 mmol NH4HCO3 and CH3CN (18% CH3CN up to 58% in 10 min, up to 95% in 1 min, down to 18% in 2 min); Detector, UV 254/220 nm. The fractions containing the pure product were concentrated and then redissolved in 5 mL of 12N hydrochloric acid. The resulting solution was concentrated under vacuum to afford 100 mg (47%) of N1-((3-(4-fluorophenyl)-1H-pyrazol-4-yl)methyl)-N1,N2-dimethylethane-1,2-diamine hydrochloride as a white solid. 1H NMR (300 MHz, D2O) δ: 7.91(s, 1H), 7.50-7.45 (m, 2H), 7.25-7.19 (m, 2H), 4.41 (s, 2H), 3.21 (s, 4H), 2.60 (s, 3H), 2.57 (s, 3H) ppm. LCMS (method J, ESI): RT=1.01 min, m/z=263.1 [M+H]+.

Provenance & Evidence