Citric Acid → 5-dimethylamino-N-(5-bromo-3-methyl-2-pyrazinyl)-1-naphthalenesulphonamide

関与物質

反応手順

Sodium hydride (60% dispersion in mineral oil; 0.1 g) was added portionwise to a stirred solution of 2-amino-5-bromo-3-methyl-pyrazine (0.188 g) in 1,2-dimethoxyethane (DME; 4 ml). After 5 minutes 5-dimethylamino-1-naphthalenesulphonyl chloride (0.3 g) was added, in a single portion, and the reaction was allowed to a stir for 18 hours. 2M Aqueous citric acid solution (10 ml) was added and the reaction was extracted with dichloromethane (3×25 ml). The combined extracts were dried (MgSO4) and evaporated to give a brown oil. The oil was purified by chromatography on silica gel, eluting with dichloromethane/diethyl ether (1:1) to give 5-dimethylanino-N-(5-bromo-3-methyl-2-pyrazinyl)-1-naphthalenesulphonamide as a cream solid (0.138 g, 33%), m.p. 171-172° C.; mass spectrum (+ve FAB, DMSO/methanol/NBA): 421 (M+H)+.

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