Potassium Carbonate → 2-(4-(trifluoromethyl)benzyl)-6-(2-chlorophenyl)-7-(4-chlorophenyl)-[1,2,4]triazolo[4,3-b]pyridazin-3(2H)-one

Participants

Reaction Conditions

Reaction Steps

To a solution of 6-(2-chlorophenyl)-7-(4-chlorophenyl)-[1,2,4]triazolo[4,3-b]pyridazin-3(2H)-one (18 mg, 0.05 mmol) and 4-trifluoromethyl benzylbromide (18 mg, 0.075 mmol) in anhydrous DMF (0.5 mL)) at 70° C. was added solid K2CO3 (13.8 mg, 0.1 mmol). After addition, the reaction mixture was stirred at 70° C. for 30 min. Analysis by HPLC/MS indicated the starting material had been consumed. After cooling to room temperature, the reaction was diluted with water, and extracted with EtOAc (5 mL×3). The combined EtOAc extracts were washed with saturated aqueous NaCl, dried (Na2SO4), filtered and concentrated under reduced pressure. The obtained residue was purified using reverse phase preparative HPLC (Conditions: Phenomenex Luna 5 μ C18 21.2×100 mm; Eluted with 70% to 100% B, 8 min gradient, hold at 100% B for 6 min (A=90% H2O, 10% MeOH and B=10% H2O, 90% MeOH); Flow rate at 20 mL/min, UV detection at 220 nm) to afford 18 mg (70%) of the title compound as a yellow powder. LC/MS (method A): retention time=4.05 min, (M+H)+=515. 1H NMR (CDCl3, 400 MHz): δ 7.57-7.70 (m, 4H), 7.42-7.48 (m, 1H), 7.41 (s, 1H), 7.30-7.38 (m, 2H), 7.17-7.25 (m, 3H), 7.02 (d,J=8.0 Hz, 2H), 5.30 (s, 2H).

Provenance & Evidence