The synthesis and antiviral activity of 1-(4-сhlorophenyl)-4-(para-tolyl)-5,6,7,8-tetrahydro-2а,4a-diazacyclopenta[cd]-azulene-2-carboxylic acid derivatives

S. A. Demchenko, Yu. A. Fedchenkova, V. V. Sukhoveev, O. S. Bagreeva, A. M. Demchenko


Aim. To synthesize, prove the structural framework and study the antiviral activity of 1-(4-chlorophenyl)-4-(para-tolyl)-5,6,7,8-tetrahydro-2a,4a-diazacyclopenta[cd]azulene-2-carboxylic acid derivatives.
Results and discussion. The antiviral activity of 1-(4-chlorophenyl)-4-(para-tolyl)-5,6,7,8-tetrahydro-2a,4adiazacyclopenta[cd]azulene-2-carboxylic acid (4-methoxyphenyl)amide was determined in the Southern Research Institute (SRI, Birmingham, Alabama). The efficacy of this compound was expressed by EC50, IC50 and SI values determined in vitro within a range of concentrations of 0.1 – 100 μg/mL. The antiviral drug Ribavirin (Sigma) and the active substance of Amizon – 4-(N-benzyl)aminocarbonyl-1-methylpyridinium iodide were used as the reference drugs.
Experimental part. Condensation of 2-methoxy-3,4,5,6-tetrahydro-7H-azepine with α-amino-4-methylacetophenone hydrochloride led to 3-(4-methylphenyl)-6,7,8,9-tetrahydro-5H-imidazo[1,2-a]azepine. By boiling the latter with α-bromo-4-chloroacetophenone in ethyl acetate 1-[2-(4-chlorophenyl)-2-oxoethyl]-3-(para-tolyl)-6,7,8,9-tetrahydro-5H-imidazo[1,2-a]azepin-1-ium bromide was isolated, which in aqueous alkali solution was converted into 1-(4-chlorophenyl)-4-(para-tolyl)-5,6,7,8-tetrahydro-2а,4a-diazacyclopenta[cd]azulene. The latter while reacting with the corresponding aryliso(thio)cyanates in a dry benzene gave 1-(4-chlorophenyl)-4-(para-tolyl)-5,6,7,8-tetrahydro-2a,4a-diazacyclopenta[cd]azulene-2-carboxylic acid (thio)amides. 1H NMR-spectra for the compounds synthesized were recorded on a Bruker VXR-300 spectrometer (Germany) with the operating frequency of 299.945 MHz, and also on a Bruker DRX300 (Germany) spectrometer with the operating frequency of 500.13 MHz, in DMSO-d6 using tetramethylsilane (TMS) as an internal standard. The melting points were measured using a RNMK 05 apparatus (VEB Analytik, Dresden).
Conclusions. The series of new 1-(4-chlorophenyl)-4-(para-tolyl)-5,6,7,8-tetrahydro-2a,4a-diazacyclopenta[cd]azulene-2-carboxylic acid (thio)amides has been synthesized. The antiviral activity of 1-(4-chlorophenyl)-4-(para-tolyl)-5,6,7,8-tetrahydro-2a,4a-diazacyclopenta[cd]azulene-2-carboxylic acid (4-methoxyphenyl)amide has been studied in the Southern American Research Institute (SRI, Birmingham, Alabama), and the high level of the antiviral activity has been found against Flu A H1N1 California/07/2009 virus.


1-(4-chlorophenyl)-4-(para-tolyl)-5,6,7,8-tetrahydro-2a,4a-diazacyclopenta[cd]azulene-2-carboxylic acid substituted (thio)amides; Ribavirin; Amizone; antiviral activity; Flu A H1N1 California/07/2009 virus

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Abbreviated key title: J. Org. Pharm. Chem.

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