Triethylamine → 5-{(3-Ethoxy-4-methoxyphenyl)-[4-(5-methyl-[1,2,4]oxadiazol-3-yl)phenylamino]methyl]-2-(3-nitropyridin-2-yl)-2,4-dihydro-[1,2,4]triazol-3-one

Participants

Reaction Conditions

Reaction Steps

After adding 28 mg of (3-nitropyridin-2-yl)hydrazine and 32 μl of triethylamine to a solution of 105 mg of {2-(3-ethoxy-4-methoxyphenyl)-2-[4-(5-methyl-[1,2,4]oxadiazol-3-yl)phenylimino]-1-methylsulfanylethylidene}carbamic acid methyl ester (Example (17e)) in 3 ml of DMF, the mixture was stirred at 85° C. for 16 hours under a nitrogen atmosphere. The reaction mixture was concentrated, and the residue was dissolved in 4 ml of a methanol:THF=1:1 mixed solvent. After adding 46 μl of acetic acid and 71 mg of sodium cyanotrihydroborate to the solution, the mixture was stirred at room temperature for 6 hours. After filtering the reaction mixture, it was purified by reverse-phase high performance liquid chromatography (acetonitrile-water, 0.1% acetic acid) to give 59 mg of 5-{(3-ethoxy-4-methoxyphenyl)-[4-(5-methyl-[1,2,4]oxadiazol-3-yl)phenylamino]methyl]-2-(3-nitropyridin-2-yl)-2,4-dihydro-[1,2,4]triazol-3-one.

Provenance & Evidence