Process for preparing carboxylic esters amido acid with internal amide bonds.

The present invention relates to processes IN A STEP ONLY TO PREPARE Esters of AMIDO - CARBOXYLIC WITH NITROGEN amidic located between two carbons carbonyl reaction of a carboxylic acid or an ester of carboxylic acid with a monohydric alcohol WELL lactam, UN AMINO aCID AMINO CARBOXYLIC aCID OR - CARBOXYLIC POLYMERIC. In this process, amidation reactions, esterification, alcoholysis and hydrolysis occur simultaneously.