2-(3-Cyclopropoxy-4-difluoromethoxyphenyl)-3-ethyl-1,5-bis(2-trimethylsilylethoxymethyl)-1,5-dihydropyrrolo[2,3-d]-pyridazin-4-one → 2-(3-Cyclopropoxy-4-difluoromethoxyphenyl)-3-ethyl-5-(2-trimethylsilylethoxymethyl)-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 4-(b) except for using 9.35 g (containing an amount corresponding to 14.0 mmol) of 2-(3-cyclopropoxy-4-difluoromethoxyphenyl)-3-ethyl-1,5-bis(2-trimethylsilylethoxymethyl)-1,5-dihydropyrrolo[2,3-d]-pyridazin-4-one obtained in Example 5-(a) in place of 2-(3-cyclopropoxy-4-difluoromethoxyphenyl)-3-methyl-1,5-bis(2-trimethylsilylethoxymethyl)-1,5-dihydropyrrolo[2,3-d]-pyridazin-4-one, whereby 5.84 g of the title compound was obtained as a white solid. (Yield: 79%)

Provenance & Evidence