Dimethylmaleic anhydride → methyl 2-(aminosulfonyl)-4-(2,5-dihydro-3,4-dimethyl-2,5-dioxo-1H-pyrrol-1-yl)benzoate
反応式
[NH2:1][C:2]1[CH:11]=[CH:10][C:5]([C:6]([O:8][CH3:9])=[O:7])=[C:4]([S:12]([NH2:15])(=[O:14])=[O:13])[CH:3]=1.[CH3:16][C:17]1[C:18]([O:20][C:21](=O)[C:22]=1[CH3:23])=[O:19]>C(O)(=O)C>[NH2:15][S:12]([C:4]1[CH:3]=[C:2]([N:1]2[C:18](=[O:19])[C:17]([CH3:16])=[C:22]([CH3:23])[C:21]2=[O:20])[CH:11]=[CH:10][C:5]=1[C:6]([O:8][CH3:9])=[O:7])(=[O:13])=[O:14]参加物
4
実験手順
In 3 ml of acetic acid, 1 mmol of methyl 4-amino-2-(aminosulfonyl)benzoate and 1.05 mmol of 2,3-dimethylmaleic anhydride were stirred at 80° C. for 40 hours. Acetic acid was then distilled off from the reaction mixture, followed by the addition of 20 ml of ice water to the oily residue. After the mixture thus formed was stirred for 2 hours, the resulting precipitate was collected by filtration and then dried in air. Yield: 43%. Its physicochemical properties are shown in Table 8.