2-Aminothiazole → 3,4-dihydro-2-methyl-3-oxo-4-(2-thiazolyl-carbamoyl)-2 H-thieno[2,3-e]1,2-thiazine 1,1-dioxide

Participants

Reaction Steps

0.15 G. of 3,4-dihydro-4-methoxycarbonyl-2-methyl-3-oxo-2H-thieno[ 2,3-e] 1,2-thiazine 1,1-dioxide and 0.071 g. of 2-aminothiazole are dissolved in 30 ml. of absolute xylene and the solution is heated for half an hour under the reflux. After cooling, the crystals are removed by filtration, recrystallized from glacial acetic acid, and 3,4-dihydro-2-methyl-3-oxo-4-(2-thiazolyl-carbamoyl)2H-thieno[ 2,3-e] 1,2-thiazine 1,1-dioxide, melting point 236° C. to 238° C. (decomposition), is obtained.

Provenance & Evidence