反应详情

A mixture of 2,7-dibromo-[1,2,4]triazolo[1,5-a]pyridine (2.16 g, 7.8 mmol) in dimethylamine (30% in EtOH, 60 ml, 355 mmol) is heated in 4 portions a ca. 540 mg/15 ml of dimethylamine in a high pressure vessel to 100° C. for 3 hours each. The batches are combined and the solvent evaporated. The light brown crude material (4.77 g) is loaded on silicagel and purified by chromatography on a 70 g silica column using heptane/ethyl acetate 10-40% as eluent affording 7-bromo-N,N-dimethyl-[1,2,4]triazolo[1,5-a]pyridin-2-amine (1.36 g, 72.3%) as a light yellow solid. Mp.: 133-4° C. MS: m/z=243.2 (M+H+).

1. customthe solvent evaporated
2. custompurified by chromatography on a 70 g silica column