[NH2:1][S:2]([C:5]1[C:6]([C:10]([OH:12])=O)=[CH:7][S:8][CH:9]=1)(=[O:4])=[O:3].S(Cl)([Cl:15])=O>>[NH2:1][S:2]([C:5]1[C:6]([C:10]([Cl:15])=[O:12])=[CH:7][S:8][CH:9]=1)(=[O:4])=[O:3]A solution of 1.0 g of 4-aminosulfonylthiophene-3-carboxylic acid in 20 ml of thionyl chloride is heated in an oil bath maintained at 90° C. for 2 hours. Rotoevaporation gives 1.0 g of the title compound, m.p. 236°-238° C.
Wird geladen…