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In previous studies of our research group, we have selectively generated a pool of new 4-thiazolidinones by three-component reaction, solvent-free and microwave-assisted, between an aldehyde derived from a carbohydrate, a heteroaromatic amine and thioglycolic acid.[i] More recently, we have studied the effect of the addition of a boron organocatalyst on the selective synthesis of a novel under the same reaction conditions.[ii] With the aim of exploring the best reaction conditions for the diastereoselective synthesis of the 1,4-thiazepan-3-ones and 4-thiazolidinones , we have studied not only the effect on solvent variation but also the aggregation of AlCl3 or different zeolites as Lewis acid catalysts (mordenita, zeolite 13x and ZSM-5). The generation of the corresponding intermediates and reaction products were monitored by CG-MS, taking reaction aliquots every five minutes of reaction. The characterization of the intermediates and corresponding reaction products were performed by NMR spectroscopy.    [i] Ocampo, R. A.; Quiroga, A. A.; Koll, L. C; Fascio, M.; D´accorso, N. B. Sintesis y caracterizacion de 4-tiazolidinonas unidas a heterociclos nitrogenados y sustituidas por un carbohidrato adecuadamente funcionalizado. XX Simposio Nacional de Quimica Organica. Argentina. Buenos Aires. 2015. [ii] Ocampo, R. A.; Quiroga, A. A.; D´accorso, N. B. Estudio de la sintesis estereo y diasteroselectiva de una nueva 1,4-tiazepan-3-ona sustituida por un hidrato de carbono utilizando irradiacion de microondas. XX Simposio Nacional de Quimica Organica. Argentina. Buenos Aires. 2017.

proceedings of the 21st international electronic conference on synthetic organic chemistry

&lt;strong&gt;Study of the effect of solvent and different Lewis acids in one pot multicomponent microwave assisted reaction for the chemoselective generation of &lt;/strong&gt;&lt;strong&gt;1.4-thiazepan-3-ones and 4-tiazolidinones.&lt;/strong&gt;