Hydrochloric Acid → HCID 22287472, compound

Participants

Reaction Steps

A solution of 2-amino-4-(4-acetamidophenylsulphanyl)nitrobenzene (Method 15) (2.4 g) in warm glacial acetic acid (15 ml) was poured onto ice (24 ml). Concentrated hydrochloric acid (4.5 ml) was added and the mixture was stirred and cooled to <5° C. A solution of sodium nitrite (0.601 g) in water (5 ml) was added over 7 minutes and the mixture was stirred for 2 hours at 0-5° C. Aqueous sulphamic acid solution (10% w/v) was added until a negative starch iodide test was observed. In a separate flask toluene was added to a solution of cuprous chloride (0.852 g) in water (1.2 ml) and concentrated hydrochloric acid (1.3 ml) and the mixture was cooled to <0° C. The first preparation (diazonium salt) was then added to the cold cuprous chloride mixture over 5 minutes and the resultant mixture was stirred at ambient temperature for 18 hours. The organic layer was separated and the aqueous layer was extracted with toluene (3×10 ml). The organic extracts were combined, washed with water and brine then dried. Volatile material was removed by evaporation and the residue was purified by chromatography on a silica gel Mega Bond Elut column eluting with 0-15% ethyl acetate/hexane to give the title compound (0.789 g). NMR: 2.1 (s, 3H), 7.1 (dd, 1H), 7.3 (d, 1H), 7.5 (d, 2H), 7.7 (d, 2H), 7.95 (d, 1H), 10.2 (brs, 1H).

Provenance & Evidence