In this work, a library of (+)‐camphor and (−)‐fenchone based N‐acylhydrazones, amides, and esters, including para‐substituted aromatic/hetaromatic/cyclohexane ring was synthesized, with potent orthopoxvirus inhibitors identified among them. Investigations of the structure‐activity relationship revealed the significance of the substituent at the para‐position of the aromatic ring. Also, the nature of the linker between a hydrophobic moiety and aromatic ring was clarified. Derivatives with p‐Cl, p‐Br, p‐CF3, and p‐NO2 substituted aromatic ring and derivatives with cyclohexane ring showed the highest antiviral activity against vaccinia virus, cowpox, and ectromelia virus. The hydrazone and the amide group were more favourable as a linker for antiviral activity than the ester group. Compounds 3 b and 7 e with high antiviral activity were examined using the time‐of‐addition assay and molecular docking study. The results revealed the tested compounds to inhibit the late processes of the orthopoxvirus replication cycle and the p37 viral protein to be a possible biological target.
A series of 1,3-disubstituted ureas containing a bicyclic lipophilic group of natural origin were synthesized by the reactions of bicyclo[2.2.1]heptane-2-yl isocyanate with amines in yields of up to 82% and by the reactions of bicyclo[2.2.1]heptan-2-amine and 1,7,7-trimethylbicyclo[2.2.1]heptan-2-amine with 1,1'-carbonyldiimidazole in yields of up to 94%. The synthesized ureas are potent inhibitors of RNA virus replication and soluble epoxide hydrolase.
Despite the fact that the variola virus is considered eradicated, the search for new small molecules with activity against orthopoxviruses remains an important task, especially in the context of recent outbreaks of monkeypox. As a result of this work, a number of amides of benzoic acids containing an adamantane fragment were obtained. Most of the compounds demonstrated activity against vaccinia virus, with a selectivity index SI = 18,214 for the leader compound 18a. The obtained derivatives also demonstrated activity against murine pox (250 ≤ SI ≤ 6071) and cowpox (125 ≤ SI ≤ 3036). A correlation was obtained between the IC50 meanings and the binding energy to the assumed biological target, the p37 viral protein with R2 = 0.60.
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