Hydrochloric Acid → N-(isobutoxycarbonyl)-N-(3-methoxy-5-methyl-2-pyrazinyl)-2-iodobenzenesulphonamide

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Reaction Steps

Isobutyl chloroformate (0.58 ml) was added dropwise to a stirred solution of N-(3-methoxy-5-methyl-2-pyrazinyl)-2-iodobenzenesulphonamide (1.65 g), triethylamine (0.57 ml) and pyridine (0.16 ml) in dichloromethane (30 ml) under an atmosphere of argon. The mixture was stirred for 2 hours and then 2H hydrochloric acid (20 ml) was added. The organic layer was separated, washed with water (20 ml) and saturated sodium chloride solution (20 ml) and dried (MgSO4). Volatile material was removed by evaporation and the residue was purified by flash chromatography, eluting with ethyl acetate/hexane (1:4 v/v), to give N-(isobutoxycarbonyl)-N-(3-methoxy-5-methyl-2-pyrazinyl)-2-iodobenzenesulphonamide (2.0 g) as a gum; 1H NMR (d6 -DMSO): 0.7 (d,2H), 1.6-1.8 (m,1H), 2.5 (s,3H), 3.9 (d,2H), 4.0 (s,3H), T.4 (dt,1H), 7.7 (dt,1H), 8.15 (s,1H), 8.2 (dd,1H), 8.35 (dd,1H).

Provenance & Evidence