Isoxazoles with antipicornavirus activity

Abstract
The synthesis and evaluation of a series of 3,5-disubstituted isoxazoles as antipicornavirus agents led to the discovery of several compounds effective in vitro against rhinovirus type 2 and poliovirus type 2. Compound 32 [5-[7-(2-chloro-4-methoxyphenoxy)heptyl]-3-methylisoxazole] was more effective than 4'',6-dichloroflavan against both viruses and was evaluated orally in mice infected intracerebrally with polio-2. A 31 mg/kg bid [twice a day], compound 32 showed a 53% survival rate as compared to 22% for the nonmedicated animals.