2-Aminothiophenol → 5-(2H-1,4-benzothiazin-3-yl)-3-nitropyrocatechol

Participants

Reaction Steps

A mixture of 2.78 g of 2-bromo-3',4'-dihydroxy-5'-nitroacetophenone, 1.51 g of 2-aminothiophenol and 50 ml of ethanol is heated to boiling under reflux for 1 hour. The reaction mixture is then cooled to room temperature, whereupon the crystals are removed by filtration under suction. There is obtained 5-(2H-1,4-benzothiazin-3-yl)-3-nitropyrocatechol of m.p. 302'-304° (from N,N-dimethylformamide/methanol).

Provenance & Evidence