Pyridine → N-(3,5-dichloropyrid-4-yl)-4-difluoromethoxy-8-acetamido-dibenzo[b,d]furan-1-carboxamide

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N-(3,5-dichloropyrid-4-yl)-4-difluoromethoxy-8-amino-dibenzo[b,d]furan-1-carboxamide (70 mg, 0.159 mmol) (intermediate 2) was treated with acetyl chloride (22 mg, 0.299 mmol) in THF (10 ml) containing pyridine (0.5 ml) at 0° C. and allowed to warm to room temperature. The reaction was stirred at room temperature for 2.0 h. THF was evaporated and the residue was washed with saturated sodium bicarbonate solution 5% HCl and water. The solid obtained was purified by silica gel column chromatography using 10% acetone-chloroform as eluent to obtain 25 mg of N-(3,5-dichloropyrid-4-yl)-4-difluoromethoxy-8-acetamido-dibenzo[b,d]furan-1-carboxamide as white solid; mp: 234° C.

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