Abstract
The synthesis of milbemycin derivatives having alkyloxy groups at the C-13 position was studied and a series of these analogs of milbemycin A4 and A3 was prepared by the reaction of 13-iodomilbemycin with a variety of alcohols. 13 beta-Phenethyloxy derivatives were found to possess excellent anthelmintic activity. Especially, the activities of derivatives with N-substituted 4-aminophenethyloxy groups were comparable to or superior to ivermectin against Nippostrongylus brasiliensis in rats.
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