Carboxylic group modification as a method of intensification of diuretic properties of 7-hydroxy-5-oxo-2,3-dihydro-1h,5h-pyrido[3,2,1-ij]quinoline-6-carboxylic acid 2-carboxyanilide
The intensive and purposeful search of fundamentally new diuretics conducted by our research laboratory among the derivatives of 4-hydroxyquinolin-2-ones has found 7-hydroxy-5-oxo-2,3-dihydro-1H,5H-pyrido[3,2,1-ij] quinoline-6-carboxylic acid 2-carboxyanilide as an intermediate lead compound. The basis for it is a high diuretic activity and a low toxicity of this substance. However, a free carboxylic group, which is often conductive to appearance of an extremely undesirable ulcerogenic action in relation to the gastro-intestinal tract, can be a serious obstacle for using the given compound as a drug. That is why we attempted to block the carboxylic group of 2-carboxyanilide by one of the known methods. For this purpose the methodology of both classical and non-classical bioisosteric replacements has been used. When conducting the synthetic part of the research the alternative ways of close structural analogues of the basic molecule were considered. As a result the optimal method for their obtaining has been offered; it differs by the minimal time costs and preparative high yields and purity of the target products. The structure of all substituted 7-hydroxy-5-oxo-2,3-dihydro-1H,5H-pyrido[3,2,1-ij] quinoline-6-carboxanilides synthesized has been confirmed by the data of elemental analysis, counter synthesis and NMR 1Н spectra. The primary pharmacological screening in studying the effect of the compounds obtained on the excretory function of the kidneys has been carried out in white outbread rats using the standard method. The testing has been performed in parallel and in comparison with Hydrochlorothiazide, as well as the abovementioned 2-carboxyanilide. It has been determined that some compounds under study in the dose of 10 mg/kg when introduced orally exceed not only Hydrochlorothiazide, but the basic molecule as well. By the results of the experiments carried out the structural and biological regularities that are important for further research have been found. As a new lead compound 7-hydroxy-5-oxo-2,3-dihydro-1H,5H-pyrido[3,2,1-ij]quinoline-6-carboxylic acid 2-carbamoylanilide has been suggested. It has no free COOH-group and, therefore, is not capable of having an great effect on the gastro-intestinal tract.
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