Synthesis of Substituted 1,4-Diazepines and 1,5-Benzodiazepines Using an Efficient Heteropolyacid-Catalyzed Procedure

An efficient and improved procedure for the synthesis of 1,4-diazepine and 1,5-benzodiazepine derivatives via the reaction of ketimine intermediates with aldehydes in the presence of Keggin-type heteropolyacids (HPAs) was developed. High yields and short reaction times were obtained for both electron-releasing and electron-withdrawing substituted 1,4-diazepine and 1,5-benzodiazepines derivatives

Synthesis and Reactions of Pyranobenzimidazole-2-thiones from Dehydroacetic Acid

International audienceAn efficient synthesis of pyranobenzimidazole-2-thiones has been described through reaction of carbon disulfide or thiophosgene with enaminone. The alkylation of pyranobenzimidazole-2-thione in the presence of methyl iodide furnished the desired S-methylated derivatives, and the reaction of pyranobenzimidazole-2-thione with copper (I) iodide and triphenylphosphine gave a dimeric complex [Cu (PPh3) (bzimtH)](2)

Difluoroboron complexes of functionalized dehydroacetic acid: electrochemical and luminescent properties

International audienceA series of dehydroacetic acid difluoroboron complexes functionalized by a Ph ring or an electroactive core (tetrathiafulvalene or ferrocene) were synthesized and characterized. The redox properties of these derivs. have been analyzed by cyclic voltammetry and the mol. structures of some of the difluoroboron complexes are presented and discussed. The photophys. properties of selected difluoroboron complexes were detd. in soln. and in the solid state evidencing an AIEE (Aggregation Induced Enhancement Emission) phenomenon