Formic Acid → 3-(2-Fluorophenyl)-7-(3-hydroxycyclobutyl)-1,2,4-triazolo[4,3-b]pyridazin-6-one

Participants

Reaction Conditions

Reaction Steps

Formic acid (8 ml) was added to a solution of 7-(3-benzyloxy-cyclobutyl)-3-(2-fluorophenyl)-1,2,4-triazolo[4,3-b]pyridazin-6-one (0.64 g, 1.64 mmol) and ammonium for-mate (1.034 g, 16.4 mmol) in methanol (40 ml). The solution was flushed with nitrogen and 10% palladium on carbon (0.3 g) was added. The resulting solution was stirred under an atmosphere of nitrogen for 2 hours at 60° C. The reaction was cooled, filtered, and concentrated under vacuum. The residue was purified by chromatography on silica using 0-10% methanol/dichloromethane as eluent to give the required product as a white solid. Data for the title compound: 1H NMR (360 MHz, DMSO), cis and trans isomers present in 5.5:1 ratio, δ 1.89-1.98 (1.7H, m), 2.21-2.29 (0.3H, m), 2.40-2.48 (0.3H, m), 2.55-2.65 (1.7H, m), 2.88-3.00 (1H, m), 4.06-4.14 (0.85H, m), 4.20-4.30 (0.15H, m), 7.38-7.47 (2H, m), 7.60-7.65 (1H, m), 7.80-7.85 (1H, m), 7.97 (0.85H, s), 8.12 (0.15H, s); MS (ES+) m/e 301 [H]+.

Provenance & Evidence