2-Amino-5-methoxybenzene-1-thiol → 2-(2-bromoethyl)-7-methoxy-2H-1,4-benzothiazin-3(4H)-one

Beteiligte Stoffe

Reaktionsschritte

A solution of 3.10 g of 2-amino-5-methoxythiophenol and 5.20 g of methyl 2,4-dibromobutyrate in 30 ml of dimethylformamide was stirred at room temperature for 2 hours. The mixture was poured into ice-water and the resulting crystals were collected by filtration and washed with water. Recrystallization from methanol gave 3.94 g (65.2%) of 2-(2-bromoethyl)-7-methoxy-2H-1,4-benzothiazin-3(4H)-one as prisms, m.p. 142°-143° C.

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