Reaktion #56281

Reaktionsgleichung

3-carbomethoxy-4-hydroxy-2-methyl-2H-thieno[2,3-e]-1,2-thiazine 1,1-dioxide

2-aminothiazole

→

4-hydroxy-2-methyl-N-(2-thiazolyl)-2H-thieno[2,3-e]-1,2-thiazine-3-carboxamide 1,1-dioxide

Lösungsmittel

xylene

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturto reflux for 7 hours, by which
2. 2
   workup.DISTILLATIONof xylene are slowly distilled off
3. 3
   SonstigeThe residual xylene is then evaporated in vacuo
4. 4
   SonstigeThe crystalline residue is recrystallized from ethanol

Vorschrift

1.9 G. of 3-carbomethoxy-4-hydroxy-2-methyl-2H-thieno[2,3-e]-1,2-thiazine 1,1-dioxide are suspended together with 0.9 g. of 2-aminothiazole in 250 ml. of absolute xylene and heated to reflux for 7 hours, by which means 150 ml. of xylene are slowly distilled off. The residual xylene is then evaporated in vacuo. The crystalline residue is recrystallized from ethanol. There is obtained 4-hydroxy-2-methyl-N-(2-thiazolyl)-2H-thieno[2,3-e]-1,2-thiazine-3-carboxamide 1,1-dioxide of melting point 217° C. (decomposition).

Quelle