Hydrochloric Acid → 2-(4-Chloro-3-sulfamoylbenzoyl)-benzo[b]furan

Beteiligte Stoffe

Reaktionsschritte

4 g 2-Bromo-4'-chloro-3'-sulfamoylacetophenone and 1.63 g salicylaldehyde are maintained for 2 hours with agitation and with exclusion of moisture at a temperature of 80° C. in 50 ml anhydrous dimethyl formamide, in the presence of 2.9 g potassium carbonate ground under anhydrous conditions. After cooling, the batch is poured into a mixture of icewater and excess hydrochloric acid, extracted with ethyl acetate and dried over sodium sulfate. After having distilled off the solvent, crystallization is carried out from di-isopropyl ether and isopropanol. M.p. 152°-156° C. Recrystallization from glacial acetic acid after clarification with active charcoal gives colorless crystals having a melting point of 167°-170° C.

Herkunft & Nachweise