Azobisisobutyronitrile → HCID 21949876, compound

Participants

Reaction Steps

N-Bromosuccinimide (340 mg, 1.90 mmol) was added to a stirred solution of the pyrazole of Example 112 (500 mg, 1.90 mmol) in carbon tetrachloride (10 ml) and azobisisobutyronitrile (20 mg) at room temperature under nitrogen. The reaction was heated under reflux for 1 hour, cooled to room temperature and concentrated under reduced pressure. The crude product was purified by flash column chromatography on silica gel eluting with pentane:ethyl acetate (80:20, by volume) to provide the title compound (340 mg) as a white solid, m.p. 76-78° C.

Provenance & Evidence