Abstract
An effective approach for synthesis of 5-methyl-3-phenyl-6-(5-phenyl-1,3,4-oxadiazol-2-yl)thieno[2,3-d]pyrimidine-2,4(1H,3H)-dione by 1,1’-carbonyldiimidazole promoted interaction of 5-methyl-2,4-dioxo-3-phenyl-1,2,3,4-tetrahydrothieno[2,3-d]pyrimidine-6-carboxylic acid with benzohydrazide has been developed. The procedure also includes cyclization of N’-benzoyl-5-methyl-2,4-dioxo-3-phenyl-1,2,3,4-tetrahydrothieno[2,3-d]pyrimidine-6-carbohydrazide obtained by boiling in phosphorous oxychloride and further hydrolysis of the chlorine atom at position 2 of the thieno[2,3-d]pyrimidine system. Alkylation of the assembly of two heterocyclic units obtained with benzyl chlorides, chloroacetamides, and 5-(chloromethyl)-3-aryl-1,2,4-oxadiazoles has allowed obtaining of 1-alkyl-5-methyl-3-phenyl-6-(5-phenyl-1,3,4-oxadiazol-2-yl)thieno[2,3-d]pyrimidine-2,4(1H,3H)-diones. The structures of the compounds obtained have been confirmed by the 1 H NMR, chromato-mass spectral and elemental microanalysis data. The results of the screening performed by the agar diffusion method (“well method”) have shown the absence of the antimicrobial activity for 1-benzyl-5-methyl-3-phenyl-6-(5-phenyl-1,3,4-oxadiazol-2-yl)thieno[2,3-d]pyrimidine-2,4(1H,3H)-diones and 2-[5-methyl-2,4-dioxo-3-phenyl-6-(5-phenyl-1,3,4-oxadiazol-2-yl)-3,4-dihydrothieno[2,3-d]pyrimidin-1(2H)-yl]-N-arylacetamides; but the activity for 1-{[3-aryl-1,2,4-oxadiazol-5-yl]methyl}-5-methyl-3-phenyl-6-(5-phenyl-1,3,4-oxadiazol-2-yl)thieno[2,3-d]pyrimidine-2,4(1H,3H)-diones has been found. The compounds of this range appeared to be active against the strains of Staphylococcus aureus, Escherichia coli and Bacillus subtilis; the diameters of their growth inhibition zones were similar to those for the reference drugs Metronidazole and Streptomycin.
Highlights
СИНТЕЗ И ПРОТИВОМИКРОБНАЯ АКТИВНОСТЬ 1-АЛКИЛ-5-МЕТИЛ-3-ФЕНИЛ-6-(5-ФЕНИЛ-1,3,4-ОКСАДИАЗОЛ-2-ИЛ)ТИЕНО[2,3-d]ПИРИМИДИН-2,4(1H,3H)-ДИОНОВ С.В.Власов, Т.П.Осолодченко, С.Н.Коваленко, В.П.Черных Ключевые слова: тиофен; пиримидин; алкилирование Разработан эффективный подход к синтезу 5-метил-3-фенил-6-(5-фенил-1,3,4-оксадиазол-2-ил)тиено [2,3-d]пиримидин-2,4(1H,3H)-диона путем промотированного 1,1’-карбонилдиимидазолом взаимодействия 5-метил-2,4-диоксо-3-фенил-1,2,3,4-тетрагидротиено[2,3-d]пиримидин-6-карбоновой кислоты с бензогидразидом
We have reported the approach using generated in situ imidazolide of thieno[2,3-d]pyrimidin-6-carboxylic acid for the reaction with benzohydrazide suitable for preparation of the product, which after cyclization in phosphorous oxychloride allows forming the 1,3,4-oxadiazole cycle in position 6 of thieno[2,3-d]pyrimidine [4]
In view of such biological activity potential of 5-methyl-3-phenyl-6-(5-phenyl-1,3,4-oxadiazol-2-yl) thieno[2,3-d]pyrimidine-2,4(1H,3H)-diones and in order to investigate the scope of the method previously proposed for modification of thieno[2,3-d]pyrimidine position 6 with 1,3,4-oxadiazole we have performed the interaction of 5-methyl-2,4-dioxo-3-phenyl-1,2,3,4tetrahydrothieno[2,3-d]pyrimidine-6-carboxylic acid [6, 7] imidazolide with benzohydrazide
Summary
The melting points (°C) were measured with a Koeffler melting point apparatus and were not corrected. 1H NMR spectra were recorded on Varian Mercury (200 MHz) spectrometers in DMSO-d6 using TMS as an internal standard (chemical shifts are in ppm).
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