反应详情

A solution of 6 g of 4-amino-N-(2,1,3-benzothiadiazol-5-yl)-1-benzenesulfonamide and 0.5 g of titanium tetrachloride in 100 ml of methanol is treated with 1 ml of freshly distilled acetaldehyde. 4 g of sodium cyanoborohydride are then added thereto and the mixture is stirred for 30 hours. Cold half-concentrated hydrochloric acid is added thereto, the mixture is worked up in the customary manner and 4-ethylamino-N-(2,1,3-benzothiadiazol-5-yl)-1-benzenesulfonamide is obtained.