4'-flavonecarboxylic acids and pharmaceutically acceptable derivatives

Abstract

This invention relates to new products of the general formula ##STR1## where R.sub.1 =H, OH, OCOCH.sub.3, OSO.sub.2 CH.sub.3, branched or unbranched alkyl containing 1 to 5 carbon atoms. R.sub.2 =NHCOR.sub.3, NHCOCH.sub.2 X, NHSO.sub.2 CH.sub.3, N(SO.sub.2 CH.sub.3).sub.2, SO.sub.2 N(CH.sub.3).sub.2, SO.sub.2 NHCH.sub.3, SO.sub.2 NCH.sub.3 CH.sub.2 CH.sub.2 OH, SO.sub.2 NH.sub.2 wherein R.sub.3 is a lower alkyl containing 1 to 4 carbon atoms; and X is NR.sub.4 R.sub.5 or ##STR2## wherein R.sub.4 and R.sub.5 are both independently lower alkyls containing 1 to 4 carbon atoms and ##STR3## is piperidine, pyrrolidine or morpholine. These products can be in the form of pharmaceutically acceptable derivatives such as esters, amides, salts. When R.sub.2 contains an amino function, the product can be in the form of an acid salt. These products are prepared from their methyl esters either by reaction between ##STR4## and paramethoxycarbonylbenzoic acid chloride or by means of derivative I such as R.sub.2 is NH.sub.2. The products of this invention are used in therapy in the prevention and treatment of complications from diabetes or as diuretics.