2-(3-Cyclopropoxy-4-difluoromethoxyphenyl)-1-(2-trimethylsilylethoxymethyl)-1,5-dihydropyrrolo[2,3-d]pyridazin-4-one → 3-Chloro-2-(4-difluoromethoxy-3-isopropoxyphenyl)-1,5-dihydropyrrolo[2,3-d]pyridazin-4-one

Participants

Reaction Steps

Reaction was carried out in the same manner as in Example 1-(b) except for using 247 mg (0.495 mmol) of 3-chloro-2-(4-difluoromethoxy-3-isopropoxyphenyl)-1-(2-trimethylsilylethoxymethyl)-1,5-dihydropyrrolo[2,3-d]pyridazin-4-one obtained in Example 40-(a) in place of 2-(3-cyclopropoxy-4-difluoromethoxyphenyl)-1-(2-trimethylsilylethoxymethyl)-1,5-dihydropyrrolo[2,3-d]pyridazin-4-one. After completion of the reaction, active carbon was added to the reaction suspension, and the mixture was stirred at room temperature for further 2 hours, and insoluble material was removed by filtration. The filtrate was concentrated under reduced pressure, the obtained solid was dissolved by adding a small amount of tetrahydrofuran, followed by addition of water, and the solid precipitated by ultrasonic wave treatment was collected by filtration. The obtained solid was washed with water and dried under reduced pressure to obtain 175 mg of the title compound as a white solid. (Yield: 96%)

Provenance & Evidence