Citric Acid → HCID 178515799, compound

Participants

Reaction Conditions

Reaction Steps

A solution of 3-(2-fluorophenyl)-5-chloro-1,2,3-triazolo[4,5-b]pyridine (1.01 g, 4.06 mmol; prepared following the procedure described in GB Patent No. 1268772 but using 2-fluoroaniline instead of aniline) and 2M sodium hydroxide (4 ml) in DMSO (15 ml) was stirred at 100° C. under nitrogen for 3 h. The mixture was cooled, diluted with water (250 ml) and neutralised with aqueous citric acid. After standing for 18 h, the brown precipitate was collected, dissolved in dichloromethane (100 ml), dried (Na2SO4), filtered and concentrated to give 3-(2-fluorophenyl)-5-hydroxy-1,2,3-triazolo[4,5-b]pyridine (0.80 g, 86%) as a brown solid. δH (360 MHz; d6-DMSO) 6.81 (1H, broad d, J=9), 7.50 (1H, dd, J=8 and 8), 7.60 (1H, dd, J=8 and 7), 7.68-7.72 (1H, m), 7.81 (1H, ddd, J=8, 8 and 2), 8.44 (1H, broad d, J=9) and 12.15 (1H, broad s); m/z (ES+) 231 (M+H+).

Provenance & Evidence