- Synthesis of benzazoles by hydrogen-transfer catalysis
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Transition-metal-catalyzed hydrogen-transfer reactions have been used for the conversion of alcohols into benzimidazoles and aldehydes into benzoxazoles and benzothiazoles.
- Blacker, A. John,Farah, Mohamed M.,Hall, Michael I.,Marsden, Stephen P.,Saidi, Ourida,Williams, Jonathan M. J.
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supporting information; experimental part
p. 2039 - 2042
(2009/09/08)
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- On the synthesis of pyrazino[2,3-b]phenazine and 1H-imidazo[4,5-b]phenazine derivatives
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Several pyrazino[2,3-b]pnenazine derivatives were prepared by the reaction of 2,3-diaminophenazine with different 1,2-diketones. Nucleophilic substitution of 2,3-dibromomethylpyrazino[2,3-b]phenazine with propanol, morpholine, and potassium thiocyanate gave 2,3-bis-(propoxymethyl )-pyrazino[2,3-b]phenazine, 2,3-bis-(4-morpholinylmethyl)-pyrazino[2,3-b]phenazine, and 2,3-bis-(cyanosulfanylmethyl)-pyrazino[2,3-b]phenazine, 2-Aryl-1H-imidazo[4,5-b]phenazine derivatives were synthesized by a one-pot reaction of 2,3-diaminophenazine with different aromatic aldehydes or acids. Reaction of 2,3-diaminophenazine with acetic anhydride and formic acid afforded 1H-imidazo [4,5-b]phenazine and 2-methyl-1H-imidazo[4,5-b]phenazine. Chemical and spectroscopic evidences for the product structures of the new compounds arc presented.
- Amer, Atef M.,El-Bahnasawi, Adel A.,Mahran, Mohamed R.H.,Lapib, Mostafa
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p. 1217 - 1225
(2007/10/03)
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