反应详情

To a suspension of 8-methyl-2-phenyl-[1,2,4]triazolo[1,5-a]pyridine-7-carboxylic acid (710 mg, 2.81 mmol) and triethylamine (1.17 ml, 8.42 mmol) in tert-butanol (20 ml) is added diphenyl phosphorazidate (909 μl, 4.21 mmol) at 25° C. After the addition the white suspension is refluxed for 24 hours. The crude material is loaded on silica and purified by flash chromatography on a 20 g silica column using heptane/ethyl acetate 10-100% and then ethyl acetate/methanol 10% as eluent affording 8-methyl-2-phenyl-[1,2,4]triazolo[1,5-a]pyridin-7-amine (160 mg, 25.4%) as a white solid. mp.: 213-5° C. MS: m/z=225.2 (M+H+).

1. additionAfter the addition the white suspension
2. temperatureis refluxed for 24 hours
3. custompurified by flash chromatography on a 20 g silica column