Methanol → HCID 59716562, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of 2-(4-(trifluoromethyl)benzyl)-7,8-bis(4-chlorophenyl)-[1,2,4]triazolo[4,3-b]pyridazin-3(2H)-one, (250 mg, 0.485 mmol), prepared as described in Example 17, in THF (4 mL) at −20° C. was added methyl magnesium bromide (0.81 mL, 2.43 mmol, 3.0 M in Et2O). The reaction was stirred at −20° C. for 30 min. LC-MS showed that the reaction was complete. To the reaction mixture was added 20 mL of MeOH to quench the reaction. The reaction was allowed to warm to RT and the solvent was evaporated. The residue was diluted with EtOAc (100 mL), washed with H2O (10 mL) and saturated aqueous NaCl (5 mL×2). The organic layer was dried (MgSO4), filtered and concentrated under reduced pressure. The crude product was purified by silica gel column chromatography using an automated system, eluting with a gradient of (0% to 80% EtOAc for 40 min. and holds at 80% for 10 min.) to give the title compound, 2-(4-(Trifluoromethyl)benzyl)-7,8-bis(4-chlorophenyl)-6-methyl-5,6-dihydro-[1,2,4]triazolo[4,3-b]pyridazin-3(2H)-one (254 mg), as a beige solid in 98% yield. HPLC retention time: 4.23 min; MS [M+H]+: found 531. 1HNMR (CDCl3, 400 MHz) 67.52 (d, 2H), 7.38 (d, 2H), 7.17-7.11 (m, 4H), 7.05 (dd, 2H), 6.94 (dd, 2H), 4.94 (s, 2H), 4.16 (q, 1H), 1.24 (d, 3H).

Provenance & Evidence