Imidazole → HCID 59812765, compound

Participants

Reaction Steps

Chloro-t-butyldimethylsilane (2.78 g, 18.5 mmol) was added in one portion to a stirred solution of the pyrazole of Example 114 (4.89 g, 16.8 mmol) and imidazole (1.48 g, 21.8 mmol) in N,N-dimethylformamide (30 ml) at room temperature under nitrogen. The reaction was stirred for 3 days and water (200 ml) was added. The aqueous phase was extracted with diethyl ether (3×200 ml) and the combined organic phases were washed with water (2×50 ml) and brine (2×50 ml), dried over magnesium sulphate, filtered and concentrated under reduced pressure. The crude product was purified by flash chromatography on silica gel eluting with dichloromethane to provide the title compound (5.60 g) as a yellow oil.

Provenance & Evidence