Acetic Anhydride → HCID 11993403, compound

Participants

Reaction Conditions

Reaction Steps

To a suspension of 6-(2-chlorophenyl)-7-(4-chlorophenyl)-3-(4-methoxybicyclo[2.2.2]octan-1-yl)-[1,2,4]triazolo[4,3-b]pyridazine (Example 18) (48 mg, 0.1 mmol) in aqueous (48%) hydrobromic acid solution (0.37 mL) was added dropwise acetic anhydride (0.33 mL). After addition, the reaction tube was sealed, and heated at 120° C. for 16 h. After cooling to room temperature, the reaction mixture was adjusted to pH 7-8 by careful addition of saturated aqueous NaHCO3, then extracted with EtOAc (10 mL×2). The combined organic was washed with water, saturated aqueous NaCl, dried (Na2SO4), filtered and concentrated under reduced pressure. The crude product was purified using reverse phase preparative HPLC (Conditions: Phenomenex Luna 5 μC18 21.2×100 mm; Eluted with 70% to 100% B, 18 min gradient, 100% B hold for 3 min, (A=90% H2O, 10% MeOH and B=10% H2O, 90% MeOH); Flow rate at 20 m/min, UV detection at 220 nm) to afford 35 mg (75%) of the title compound as a white solid. HPLC/MS (method A): retention time=3.61 min, (M+H)+=465.2.

Provenance & Evidence