| 摘要 |
Compounds of the formula: <CHEM> wherein the broken line at the 22-23 position represents an optional double bond and wherein either R<1> is H or OH and the double bond is absent, or, the double bond is present and R<1> is absent; R<2> is =CH2 or a group of the formula -(X)-C(R<5>)=CHR<6>; R<3> is H or CH3: R<5> and R<6> are both H; R<5> is H and R<6> is C1-C3 alkyl; or one of R<5> and R<6> is H and the other is phenyl, heteroaryl, C2-C6 alkoxycarbonyl or substituted phenyl or heteroaryl wherein said substituent is fluorine, chlorine, C1-C4 alkyl, C1-C4 alkoxy, C1-C4 alkylthio, hydroxy(C1-C4)alkyl, cyano, aminosulphonyl, C2-C6 alkanoyl, C2-C6 alkoxycarbonyl, nitro, trifluoromethyl, trifluoromethoxy, amino or mono or di-C1-C4 alkylamino; and X is a direct bond or is an alkylene group having from 2 to 6 carbon atoms which may be straight or branched-chain; with the proviso that R<5> and R<6> are not both hydrogen when X is -CH(CH3)CH2-, are broad spectrum antiparasitic agents having utility as anthelmintics, ectoparasiticides, insecticides, acaricides and animal growth promotants. |
