3-Chloro-2-(3-cyclobutoxy-4-difluoromethoxyphenyl)-1-(2-trimethylsilylethoxymethyl)-1,5-dihydropyrrolo[2,3-d]pyridazin-4-one → 3-Chloro-2-(3-cyclobutoxy-4-methoxyphenyl)-1,5-dihydropyrrolo[2,3-d]pyridazin-4-one

Participants

Reaction Steps

Reaction and post treatment were carried out in the same manner as in Example 32-(b) except for using 335 mg (0.70 mmol) of 3-chloro-2-(3-cyclobutoxy-4-methoxyphenyl)-1-(2-trimethylsilylethoxymethyl)-1,5-dihydropyrrolo[2,3-d]-pyridazin-4-one obtained in Example 45-(a) in place of 3-chloro-2-(3-cyclobutoxy-4-difluoromethoxyphenyl)-1-(2-trimethylsilylethoxymethyl)-1,5-dihydropyrrolo[2,3-d]pyridazin-4-one, whereby 204 mg of the title compound was obtained as a white solid. (Yield: 84%)

Provenance & Evidence