SYNTHESIS OF NON-CYCLIC COMPOUNDS WITH A FRAGMENT OF 1,3-THIAZOLE
Abstract
In this work, the synthesis and properties of non-cyclic two- and three-link products are discussed. The products are obtained by the interaction of the corresponding phthalonitrile, which was converted under the action of nartium methoxide in methanol into the corresponding 1,1-dimethoxy-3-iminoisoindolines, and input in the reaction with 2,4-diamino 1,3-thiazole hydrochloride. To obtain the latter, we have improved the proposed method. It is known that most of the substituted thiazoles are obtained by the interaction of the corresponding derivatives of thiourea with chloroacetaldehyde in the presence of triethylamine. We have tested this technique, which showed the acceptability of this method for the synthesis of 2,4-diamino-1,3-thiazole hydrochloride, which was previously obtained from thiourea and chloroacetonitrile by heating in alcohol. The use of 2,4-diamino-1,3-thiazole hydrochloride as a starting product in the synthesis of non-cyclic two- and three-link compounds is justified, because 2,4-diamino-1,3-thiazole is an unstable compound and it is easily oxidized. It was found that the presence of atmospheric oxygen promotes the formation of diketones (2,4-bis (isoindol-1-ylideneamino-3-one) -1,3-thiazole). For the targeted (direct) synthesis of 2,4-bis (3-iminoisoindolin-1-ylideneamino) -1,3-thiazole, was used an argon “pad”. As a result, the target compound was obtained, which was isolated (singled out) from the reaction mass by distilling off the solvent, the target compound was washed with organic solvents. The transition to substituted phthalonitrile has showed completely different results. A mixture of two products was obtained, the presence of which was established on the basis of mass spectrometry data and electronic absorption spectra. In contrast to the previous three-link products, the reaction proceeded in the direction of the formation of a three-link product, which contains two thiazole and one tert-butyl-substituted isoindole fragments. It turned out to be difficult to carry out chromatographic separation of the products due to the instability of the obtained compounds. The structure of the synthesized substances was established on the basis of modern research methods: electronic, IR, 1H NMR spectroscopy, mass spectrometry. Using the TDDFT/B3LYP/6-31G method, we calculated the theoretical absorption spectrum of an optimized 2,4-bis (3-iminoisoindolin-1-ylideneamino) -1,3-thiazole molecule.
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