Etude Des Effets De Quelques Catalyseurs Sur La Preparation Des 3,4-dihydropyrimidinones, Des 1,4- Dihydropyridines Et Des Pyrano[2,3-c]pyrazoles
Résumé: In this manuscript, we were interested in the development of the multi-component reactions by the study of the catalytic power of some catalysts on the reaction of Biginelli, the reaction of Hantzsch and the synthesis of pyrano[2.3-c]pyrazoles. The first chapter concerns the synthesis of the 3,4-dihydropyrimidinones (DHPMs) based on the general reaction of Biginelli, which is considered as one of the most important MCRs, by using two catalysts: the Copper acetate (Lewis acid) and Pyridinium-ptoluenesufonate (complex liquid). The second chapter is dedicated to the synthesis of a range varied by 1,4- dihydropyridines (or DHPs) according to the general reaction of Hantzsch with some modifications, which imply (involve) the absence of solvent and the use of " the salicylic acid (carboxylic acid) and of Pyridinium-p-toluenesufonate " as an unusual catalyst of this reaction. The third chapter concerns the catalytic study of two new catalysts in the synthesis of pyrano[2.3-c]pyrazole, which are not only available, but also little expensive and little toxic, namely: "phenylboronic acid and triphenylphosphine ".
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