Discovery of an orally bioavailable isoxazoline benzoxaborole ( AN8030 ) as a long acting animal ectoparasiticide
作者:Yong-Kang Zhang、Jacob J. Plattner、Eric E. Easom、Yasheen Zhou、Tsutomu Akama、Wei Bu、W. Hunter White、Jean M. Defauw、Joseph R. Winkle、Terry W. Balko、Shenghai Guo、Jian Xue、Jianxin Cao、Wuxin Zou
DOI:10.1016/j.bmcl.2015.10.044
日期:2015.12
A novel series of isoxazoline benzoxaborole small molecules was designed and synthesized for a structure-activity relationship (SAR) investigation to assess the ectoparasiticide activity against ticks and fleas. The study identified an orally bioavailable molecule, (S)-3,3-dimethyl-5-(5-(3,4,5-trichlorophenyl)- 5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl) benzo[c][1,2] oxaborol-1(3H)-ol (38, AN8030), which was long lasting in dogs (t(1/2) = 22 days). Compound 38 demonstrated 97.6% therapeutic effectiveness within 24 h of treatment, with residual efficacy of 95.3% against American dog ticks (Dermacentor variabilis) on day 30 and 100% against cat fleas (Ctenocephalides felis) on day 32 after a single oral dose at 50 mg/kg in dogs. (C) 2015 Elsevier Ltd. All rights reserved.