| 摘要 |
NEW MATERIAL:A compound expressed by formula I (R<1> is H, halogen, lower alkyl, lower alkoxy or 2-chloro-4-trifluoromethylphenoxy; R<2> is H, NO2, CF3 or lower alkoxycarbonylamino; R<3> is SR<4>, OR<5> or NR<7>R<8>; R<4> is alkyl, alkenyl, benzyl, etc.; R<5> is alkyl, alkenyl, cycloalkyl, etc.; R<7> and R<8> are H, lower alkyl, phenyl, etc.). EXAMPLE:3-Methylthio-1,4,2-benzothiazine-1,1-dioxide. USE:A phytotoxicity reducing agent caused by the existing agricultural chemicals, germicide or herbicide. PREPARATION:A compound expressed by formula (a) (Hal is halogen) is reacted with CS2 in an inert solvent in the presence of >=2 equiv. base to give a compound expressed by formula (b) (M<+> is cation derived from alkali metal or alkaline earth metal), which is then reacted with an alkylating agent expressed by the formula R<4>X (X is halogen, sulfuric acid residue or sulfonic acid residue) to afford the aimed compound expressed by formula (c) in formula I. |
