Triethylamine → 5-{[2-Fluoro-3-(2-fluoroethoxy)-5-methoxyphenyl]-[4-(5-methyl-[1,2,4]oxadiazol-3-yl)phenylamino]methyl}-2-pyrimidin-2-yl-2,4-dihydro-[1,2,4]triazol-3-one

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Reaction Steps

After adding 1.09 g of 2-hydrazinopyrimidine [CAS No. 7504-94-1] and 1.37 ml of triethylamine to a solution of 5.0 g of {2-[2-fluoro-3-(2-fluoroethoxy)-5-methoxyphenyl]-2-[4-(5-methyl-[1,2,4]oxadiazol-3-yl)phenylimino]-1-methylsulfanylethylidene}carbamic acid methyl ester in 50 ml of DMF, the mixture was stirred at 85° C. for 20 hours and 30 minutes under a nitrogen atmosphere. The reaction mixture was concentrated, and the residue was dissolved in 30 ml of methanol, 10 ml of THF and 3 ml of acetic acid. Next, 2.0 g of sodium cyanotrihydroborate was added to the solution, and after stirring at room temperature for 3 hours, 1.0 g of sodium cyanotrihydroborate was further added and stirring was continued for 2 hours and 30 minutes at room temperature. Water and ethyl acetate were added to the reaction mixture, and the insoluble portion was filtered off to give the title compound as a white solid. The filtrate was extracted with ethyl acetate and the organic layer was concentrated under reduced pressure. The residue was purified by NAM silica gel column chromatography (methanol-ethyl acetate) to give the title compound (total: 4.88 g) as a white solid.

Provenance & Evidence