反应详情

0.3 G. of 3,4-dihydro-4-methoxycarbonyl-3-oxo-2H-thieno[ 2,3-e] 1,2-thiazine 1,1-dioxide and 0.13 g. of 2-aminopyridine are dissolved in 30 ml. of absolute xylene and the solution is heated for 1 hour under reflux. After cooling, the crystals are removed by filtration and recrystallized from glacial acetic acid. 3,4-Dihydro-2-methyl-3-oxo-4-(2-pyridyl-carbamoyl)-2H-thieno [2,3-e] 1,2-thiazine 1,1-dioxide, melting point 225° C. to 256° C. (decomposition), is obtained.

1. temperatureunder reflux
2. temperatureAfter cooling
3. customthe crystals are removed by filtration
4. customrecrystallized from glacial acetic acid