Hydrochloric Acid → 4-Methoxy-dibenzo[b,d]furan-1-sulfonyl chloride

Participants

Reaction Conditions

Reaction Steps

Intermediate 40 (400 mg, 1.87 mmol) was dissolved in glacial acetic acid (20 ml) and 17% HCl (10 ml). This solution was cooled to 5° C. and a solution of sodium nitrite (260 mg, 3.74 mmol) in water (5 ml) was added slowly during 10 min. The reaction was stirred for 1 h at 5° C. The reaction mixture was then added to a saturated solution of sulfur dioxide (generated from sodium sulfite and conc. HCl) in acetic acid: benzene (3:2) containing cupric chloride dihydrate (100 mg, 0.513 mmol). The reaction was sired at room temperature for 20 h and then poured water (500 ml) and extracted with ethyl acetate (3×100 ml). The extract was washed with water (5×100 ml) and dried over anhydrous sodium sulfate. The solvent was evaporated to give the product as brown solid (350 mg) which was directly used to make the sulfonamide.

Provenance & Evidence