中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | 6-bromo-2,2-dimethyl-3,4-dihydro-2H-1,4-benzothiazine | 591221-26-0 | C10H12BrNS | 258.182 |
—— | 4-amino-6-bromo-2,2-dimethyl-3,4-dihydro-2H-1,4-benzothiazine | 591221-32-8 | C10H13BrN2S | 273.197 |
—— | 6-bromo-2,2-dimethyl-4-nitroso-3,4-dihydro-2H-1,4-benzothiazine | 591221-30-6 | C10H11BrN2OS | 287.18 |
—— | 6-cyano-2,2-dimethyl-3,4-dihydro-2H-1,4-benzothiazine | 591221-29-3 | C11H12N2S | 204.296 |
1-(6-溴-2,2-二甲基-2,3-二氢-苯并[1,4]噻嗪-4-基)-吡咯烷-2-酮 | 1-(6-bromo-2,2-dimethyl-3H-1,4-benzothiazin-4-yl)pyrrolidin-2-one | 591221-34-0 | C14H17BrN2OS | 341.272 |
The products obtained when α-(o-nitrophenylthio) acids are reduced by means of sodium borohydride and palladium–charcoal depend on (a) the reaction temperature, (b) the solvent, (c) the length of time in which the α-(o-nitrophenylthio) acid is in contact with the reducing agent, and (d) the nature of the substituents on the α-(o-nitrophenylthio) acid. By varying these conditions, benzothiazine hydroxamic acids (i.e. substituted 3,4-dihydro-4-hydroxy-3-oxo-2H-1,4-benzothiazines), the corresponding lactams (3,4-dihydro-3-oxo-2H-1,4-benzothiazines), and derivatives of 2-carboxymethylthioazobenzene can be prepared.In two cases, additional products were obtained. When (o-nitrophenylthio)acetic acid was catalytically reduced for 30 min in dioxane, 3,4-dihydro-3-oxo-2H-1,4-benzothiazine-1,1-dioxide (VIc) was an unexpected product, and when α-(4-trifluoromethyl-2-nitrophenylthio)-isobutyric acid was left for a prolonged time in contact with sodium borohydride and palladium–charcoal, a derivative of hydrazobenzene, namely, 2-carboxy(α,α-dimethyl)methylthio-5-trifluoromethylhydrazobenzene (V), was one of the three identified products.