Synthesis and Antiviral Properties of Ethyl(3-ethyladamant-1-yl)carbamate

The new adamantine derivative ethyl(3-ethyladamant-1-yl)carbamate was found to have high antiviral activity against herpes simplex virus and vaccinia viruses, as well as adenovirus (EC 50 = 0.62, 5.15, and 48.5 μg/ml respectively). Activity against the herpesvirus was demonstrated in experiments in various cell cultures using different virus strains, including a variant resistant to acycloguanosine (ACG). Simultaneous application of ethyl(3-ethyladamant-1-yl)carbamate and ACG increased the inhibition of herpesvirus reproduction in cell cultures and decreased the mortality of laboratory animals with experimental herpesvirus neuroinfection as compared with the use of each substance alone. 3-Ethyladamant-1-yl)carbamate was a low-toxicity compound, did not inhibit DNAsynthesis in uninfected cell cultures, and its acute intragastric LD 50 for white mice was 1831.8 mg/kg.