| 摘要 |
The invention relates to new benzazole derivatives of the formula I <CHEM> wherein X is oxygen or sulphur, R1 is lower alkyl, lower alkenyl or cycloalkyl, optionally substituted, R2 and R3 independently of one another are each hydrogen, lower alkyl or cycloalkyl radicals or taken together are a substituted or unsubstituted bivalent hydrocarbon residue of aliphatic character in which the carbon atoms of the chain may be interrupted by a heteroatom, R4 is either a group <CHEM> wherein R5 and R6 independently of one another are each hydrogen, lower alkyl or cycloalkyl radicals, optionally substituted, or taken together R5 and R6 are a substituted or unsubstituted bivalent hydrocarbon residue of aliphatic character in which the carbon atoms of the chain may be interrupted by a heteroatom, or, R4 is a group <CHEM> where R7 is a lower alkyl group, and their salts and N-oxides. The products are useful as anthelmintic effective agents. The products can be prepared to methods known per se.
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