Methanol → HCID 57940632、化合物

Trimethylsilyl isocyanide (0.920 mL) was added to 1-[1-(6-methoxy-3-pyridyl)-5-(2-pyridyl)pyrazole-3-carbonyl]hexahydropyridazine (0.397 g) obtained in Example 162 in 1,4-dioxane (3 mL) at room temperature, followed by stirring at an external temperature of 110° C. in a sealed tube for 4 days. Subsequently, the mixture was cooled in air. After methanol was added to the reaction mixture, the reaction solvent was removed under reduced pressure. The residue was partitioned between saturated aqueous solution of sodium hydrogencarbonate and a mixture solvent of chloroform-methanol (20:1). The organic layer was washed with saturated brine, and then dried over sodium sulfate anhydrate. The mixture was subjected to filtration, and the solvent was removed under reduced pressure. The residue was purified through silica gel column chromatography (chloroform-methanol), to thereby give the title compound as a solid (0.122 g, 25%).