ХІМІЧНІ ВЛАСТИВОСТІ ГІДРОХЛОРИДІВ 6,7-ДИЗАМІЩЕНИХ 2- (ДИХЛОРО(п-АЛКОКСІФЕНІЛ)ТЕЛУРОМЕТИЛ)-2,3-ДИГІДРО-5Н- [1,3]ТІАЗОЛО[3,2-А]ТІЄНО[2,3-D]ПІРИМІДИН-5-ОНІВ

Abstract

Tellurium-containing condensed heterocyclic substances exhibit high physiological and biological activity. The hydrochlorides of 6,7-disubstituted 2-(dichloro(p-alkoxyphenyl) telluromethyl)-2,3-dihydro-5H-[1,3]thiazolo[3,2-a]thieno[2,3-d]pyrimidine-5-ones were observed via electrophilic heterocyclization of N-alkenyl derivatives of 5,6-disubstituted 2-thioxothieno [2,3-d] pyrimidine-4-one by p-alkoxyphenyltellurium trichlorides. Treatment of synthesized hydrochlorides by aqueous solution of sodium sulfite in equimolar ratio leads to salts of dehydrohalogenation and excess of sodium sulfite – to the reduction of tellurium with formation of 6,7-disubstituted 2-(palkoxyphenyltelluromethyl)- 2,3-dihydro-5H-[1,3 ]thiazolo[3,2-a]thieno[2,3-d]pyrimidine-5-ones, and reduction does not split tellurium-carbon bond, as can be observed via the action of sodium borohydride.