A synthesis of novel bis-1,4-DHPs was reported. Two possible synthetic approaches for these compounds were investigated. In the first approach the monopodal 1,4-DHPs were used as building blocks for the construction of the target molecules via a simple alkylation. In the second strategy the appropriate bis-aldehydes have been synthesized in a first step followed by reaction with four equivalents of 3-aminobut-2-enenitrile using different catalysts under microwave irradiation as well as under conventional heating to give the corresponding bis-1,4-DHPs in good to excellent yield. The oxidative aromatization of some derivatives of the latter compounds into the corresponding bis-2,6-dimethylpyridine-3,5-dicarbonitrile derivatives was achieved using ceric ammonium nitrate (CAN).
Strapped porphyrins were prepared directly by the acid-catalyzed condensation reaction of 3,3′-diethyl-4,4′-dimethyl-2,2′-dipyrrylmethane and methylenedioxy bridged dialdehydes having a strap linkage longer than 7 atoms. Dimeric and trimeric porphyrins with coplanar and orthogonal (T-shape) geometries were also synthesized in good yields as an application of this method. In the strapped porphyrins, the distortion of porphyrin ring increases systematically on shortening the strap linkage, which is confirmed by their 1H NMR data, red shifted absorption, and fluorescence spectra. In the coplanar dimeric and trimeric porphyrins, the electronic interactions between the porphyrins were distinctly observed, while in the orthogonal “T-shaped” dimers and “H-shaped” trimers, appreciable electronic interactions were not observed.
Synthesis of novel amide-crownophanes and Schiff base-crownophanes based on<i>p</i>-phenylene, 2,6-naphthalene, and 9,10-anthracene
作者:Hussni A. Muathen、Nour A. M. Aloweiny、Ahmed H. M. Elwahy
DOI:10.1002/jhet.129
日期:2009.7
The novel macrocyclic diamides , are obtained in 45–66% yields by the reaction of dipotassium salts and with each of 1,4-di(bromomethyl)benzene , 2,6-di(bromomethyl)naphthalene and 9,10-di(bromomethyl)anthracene , repectively, in boiling DMF. On the other hand, the new macrocyclic Schiff bases and are obtained in 44% and 42% yields by heating the appropriate bis-amines , with the corresponding bis-aldehydes
作者:S. V. Zaitseva、S. A. Zdanovich、A. S. Semeikin、O. A. Golubchikov
DOI:10.1023/a:1024978524497
日期:——
3,3'-Dibutyl-4,4'-dimethylpyrrolylmethane was reacted with 9,10-bis(2-formylphenyloxymethyl)anthracene to synthesize a capped porphyrin, and its zinc complex was prepared. The coordination properties of the capped zinc porphyrin in extra coordination with N-methylimidazole, imidazole, pyridine, 3,5-dimethylpyrazole, and dimethylformamide in omicron-xylene were studied. A correlation of the stability of the extra complexes and the basicity of the extra ligands was established. A correlation between the stability of the extra complexes and the shifts of their principal electronic absorption bands with respect to those of the zinc porphyrin was found. Deformations of the porphyrin ligand were noted to affect the strengyh of the metal-extra ligand sigma bond. The geometric and energetic characteristics of the fivecoordinate zinc porphyrin were obtained by quantum-chemical calculations. A correlation between the calculated energy of interaction of the central metal atom with the nitrogen atom of the extra ligand and the stability of the extra complexes of the capped Zn porphyrin was revealed.
Short‐Chained Anthracene Strapped Porphyrins and their Endoperoxides
作者:Susan Callaghan、Keith J. Flanagan、John E. O'Brien、Mathias O. Senge
DOI:10.1002/ejoc.202000283
日期:2020.5.14
The syntheses of short‐chained anthracene‐strapped porphyrins and their Zn(II)complexes are reported. The key synthetic step is a [2+2] condensation between a dipyrromethane and an anthracene bisaldehyde, 2,2'‐((anthracene‐9,10‐diylbis(methylene))bis(oxy))dibenzaldehyde. Following exposure to white light, self‐sensitized singlet oxygen and the anthracene moieties underwent [4+2] cycloaddition reactions
Microwave Assisted Multi-Component Synthesis of Novel Bis(1,4-dihydropyridines) Based Arenes or Heteroarenes
作者:Ahmed H. M. Elwahy、Ismail A. Abdelhamid、Sherif M. H. Sanad、Refaie M. Kassab
DOI:10.3987/com-16-13441
日期:——
A synthesis of novel bis-1,4-DHPs was reported. Two possible synthetic approaches for these compounds were investigated. In the first approach the monopodal 1,4-DHPs were used as building blocks for the construction of the target molecules via a simple alkylation. In the second strategy the appropriate bis-aldehydes have been synthesized in a first step followed by reaction with four equivalents of 3-aminobut-2-enenitrile using different catalysts under microwave irradiation as well as under conventional heating to give the corresponding bis-1,4-DHPs in good to excellent yield. The oxidative aromatization of some derivatives of the latter compounds into the corresponding bis-2,6-dimethylpyridine-3,5-dicarbonitrile derivatives was achieved using ceric ammonium nitrate (CAN).