反应详情

A solution of pyridine-2,6-dicarboxylic acid monoethyl ester (1.00 g, 5.12 mmol), triethylamine (1.04 g, 10.24 mmol), diphenylphosphoryl azide (DPPA) (1.93 g, 7.02 mmol) and tert-butanol (3.00 ml) in toluene (30.00 ml) was warmed at 100° C. for 20 h. The mixture was then cooled at room temperature, diluted with ethyl acetate and washed with saturated sodium bicarbonate and brine. The organic layer was then dried over sodium sulphate and evaporated. The residue was purified by flash chromatography to yield 6-tert-butoxycarbonylamino-pyridine-2-carboxylic acid ethyl ester (1.06 g, 78%) as a viscous orange oil, MS (ISP): m/e=267.3 (M+H+).

1. washwashed with saturated sodium bicarbonate and brine
2. dry with materialThe organic layer was then dried over sodium sulphate
3. customevaporated
4. customThe residue was purified by flash chromatography