Methanol → Methyl 4-amino-3-isothiazolecarboxylate hydrochloride

Participants

Reaction Steps

A suspension of 52.0 g of 4-amino-3-isothiazolecarboxylic acid hydrochloride [prepared by the method of K. Gewald and P. Billman, Liebigs Ann. 1542 (1979)] in 300 ml methanol was cooled in an ice-bath and 10 ml of thionyl chloride was added dropwise. The reaction mixture was refluxed 3 hours, cooled and the solvent evaporated. The residual solid was collected, washed with ether and dried giving 47.5 g of methyl 4-amino-3-isothiazolecarboxylate hydrochloride, m.p. 170° (d).

Provenance & Evidence