Antivertigo agents. V. Quantitative structure-activity relationships of 6-(2-(4-aryl-1-piperazinyl)ethyl)-5,6,7,8-tetrahydro-1,6-naphthyridines.

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Abstract
The quantitative structure-activity relationships (QSAR) between the molecular structures and antivertigo activities of 6-[2-(4-aryl-1-piperazinyl)ethyl]5,6,7,8-tetrahydro-1,6-naphthyridines were investigated. The effects of the ortho-, and meta-, and para-substituents on the phenyl ring of the arylpiperazine moiety were examined by means of regression analysis using various physicochemical parameters related to these substituents. The results showed that only the parameters concerning the ortho-substituent were statistically significant. Namely, the relative activity depended on both Fortho (Swain-Lupton field effect constant of the ortho-substituent) and I(indicator variable for the presence of an ortho-alkoxy group and an ortho-dimethylamine group). Thus, regression analysis for only the ortho-substituted compounds was examined and afforded a result similar to that described above. Further, the net atomic charge calculated by the molecular orbital method besides free energy-related substituent parameters was used as electronic parameters of the ortho-substituents on the phenyl ring for this QSAR analysis. For the ortho-substituted compounds alone, the potency correlated well with the net atomic charge on the first atom on the ortho-substituent (Qortho), while the correlation for all the compounds (ortho-, meta-, and para-substituents) was slightly lower than that for the ortho-substituted compounds alone. It was found that increase in the negative net atomic charge on the first atom of the ortho-position increased the relative activity. The correlation between Qortho, and Fortho and I was examined and the role of I is discussed in connection with hydrogen bond-forming ability. The interaction between the aryl-piperazine moiety in the compound and a putative receptor is discussed based on the QSAR analysis.

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