Polyfluorinated 2,4-diaryl-2,3-dihydro-1H-1,5-benzodiazepines: Synthesis and new rearrangement into polyfluorodihydrobenzimidazo[1,2-a]quinolines
摘要:
Interaction of polyfluorinated chalcones (pentafluorobenzalacetophenone, benzalpentafluoroacetophenone and decafluorochalcone) with 1,2-diaminobenzene in alcohols in the presence of triethylamine or quaternary ammonium salt (TEBAC) has been investigated. In the presence of TEBAC in 2-propanol polyfluorinated 2,4-diaryl-2,3-dihydro-1H-1,5-benzodiazepines are formed. Some of them undergo intramolecular fluorine substitution and unusual rearrangement into a previously unknown polyfluoro-containing tetracyclic compounds-(6aR)-1,2,3,4-tetrafluoro-6a-aryl-6a,7-dihydrobenzimidazo[1,2-a]quinolines, under the reaction conditions as well as in absence of TEBAC. The structures are established on NMR spectra and confirmed by X-ray. (C) 2014 Elsevier B.V. All rights reserved.
Polyfluorinated 2,4-diaryl-2,3-dihydro-1H-1,5-benzodiazepines: Synthesis and new rearrangement into polyfluorodihydrobenzimidazo[1,2-a]quinolines
摘要:
Interaction of polyfluorinated chalcones (pentafluorobenzalacetophenone, benzalpentafluoroacetophenone and decafluorochalcone) with 1,2-diaminobenzene in alcohols in the presence of triethylamine or quaternary ammonium salt (TEBAC) has been investigated. In the presence of TEBAC in 2-propanol polyfluorinated 2,4-diaryl-2,3-dihydro-1H-1,5-benzodiazepines are formed. Some of them undergo intramolecular fluorine substitution and unusual rearrangement into a previously unknown polyfluoro-containing tetracyclic compounds-(6aR)-1,2,3,4-tetrafluoro-6a-aryl-6a,7-dihydrobenzimidazo[1,2-a]quinolines, under the reaction conditions as well as in absence of TEBAC. The structures are established on NMR spectra and confirmed by X-ray. (C) 2014 Elsevier B.V. All rights reserved.
Reactions of polyfluorochalcones with o- and p-phenylenediamines. Synthesis and intramolecular transformations of polyfluorinated 2,4-diaryl-2,3-dihydrobenzo-1H-1,5-diazepines
作者:E. A. Borodina、N. A. Orlova
DOI:10.1134/s1070428015020207
日期:2015.2
Polyfluorochalcones react with o-phenylenediamine in ethanol and 2-propanol in the presence of triethylamine or benzyltriethylammonium chloride (TEBAC) affording polyfluorinated 2,4-diaryl-2,3-dihydrobenzo-1H-1,5-diazepines. Along with the latter in the presence of triethylamine Michael aza-adducts presumably formed, and at the use of TEBAC in 2-propanol products of intramolecular cyclization and rearrangement of benzo-1,5-diazepines, dihydrobenzimidazo[1,2-a]quinolines were obtained. The reactions of polyfluorochalcones with p-phenylenediamine in ethanol or DMF proceed mostly with the substitution of the para-fluorine atom in the perfluorophenyl rings.