T. I. Polyakova

Synthesis of 6-hetaryl-substituted azulenes and their reactions with 2,6-diphenylpyrylium perchlorate

A method for the synthesis of 4,6,8-trimethyl- and 4,8-dimethyl-6-(2-thienyl, 2-benzothiazolyl) azulenes from 2,6-dimethyl-4-(methyl, 2-thienyl, 2-benzothiazolyl)-pyrylium perchlorates and cyclopentadienyllithium is described. The possibility of direct pyrylation of azulenes with 2,6-diphenylpyrylium perchlorate is demonstrated. Azulenes with a pyrylium ring in the 1 position were synthesized, and their behavior with respect to ammonium acetate was investigated.

Synthesis of 2-aryl-3,4,5,6-bis(trimethylene) pyrylium salts and the corresponding pyridine bases

Abstract2-Aryl-3,4,5,6-bis(trimethylene)pyrylium perchlorates were obtained by acylation of cyclopentylidenecyclopentanone with aromatic acid chlorides in the presence of anhydrous aluminum chloride with subsequent treatment with 70% perchloric acid. The synthesized salts were converted to the corresponding pyridine bases.

Synthesis of hetaryl-substituted pyrylium salts and hetarylpyridines from tertiary heterocyclic carbinols

The synthesis of dimethyl benzothiazol-2-yl, 2-thienyl, and 1-methylbenzimidazol-2-yl carbinols and their acylation with acetic anhydride in the presence of perchloric acid have been performed. A method for the synthesis of 4-(benzothiazoI-2-yl)-2,6-dimethylpyrylium and 4-(2-thienyl)-2,6-dimethylpyrylium perchlorates has been developed; these substances are converted by treatment with aqueous ammonia, into the corresponding 4-(2-hetaryl)-2,6-di-methylpyridines.

Synthesis and reactions of 4-(benzothiazol-2-yl)-2,6-dimethylpyrylium perchlorate

A new method has been developed for the synthesis of 4-(benzothiazol-2-yl)-2,6-dimethylpyrylium perchlorate from 2,6-dimethyl-γ-pyrone and 2-lithiobenzothiazole. The reaction of this salt with ammonia and with primary and secondary amines, hydrazine, phenylhydrazine. and hydroxylamine leads to the formation of difficultly accessible hetaryl-substituted benzothiazoles.