- γ-Maghemite-silica nanocomposite: A green catalyst for diverse aromatic N-heterocycles
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γ-Maghemite-silica nanocomposite has been applied as a green catalyst to synthesize variety of aromatic N-heterocycles under solvent free conditions. Characterization was done by modern analytical tools (UV, IR, AAS, DSC, EDXRF, powdered XRD, EPR, Mo?ssbauer and TEM). Mild reaction conditions and recyclability have made the present protocol both environmentally and economically viable.
- Ghosh, Pranab,Mandal, Amitava,Subba, Raju
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p. 146 - 152
(2013/09/02)
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- Studies on Pyrazines. Part 27. A New Deoxidative Nucleophilic Substitution of Pyrazine N-Oxides; Synthesis of Azidopyrazines with Trimethylsilyl Azide
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Azidopyrazines bearing amino, methoxy and/or phenylgroups have been synthesized by reaction of pyrazine N-oxides with trimethylsilyl azide in the presence of diethylcarbamoyl chloride in refluxing acetonitrile.In most cases, the azidation occurs only at t
- Sato, Nobuhiro,Miwa, Naoko,Hirokawa, Noriko
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p. 885 - 888
(2007/10/02)
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- COUPLING REACTION OF CHLOROPYRAZINES AND THEIR N-OXIDES WITH TETRAPHENYLTIN
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By the coupling reaction of monochloropyrazines, dichloropyrazines, 2-chloropyrazine 1-oxides, and 2-chloropyrazine 4-oxides with tetraphenyltin, the corresponding phenylpyrazines were prepared in satisfactory yields.
- Ohta, Akihiro,Ohta, Masakatsu,Watanabe, Tokuhiro
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p. 785 - 792
(2007/10/02)
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- Syntheses and Reactions of Some 2,3-Disubstituted Pyrazine Monoxides
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The reactions of 2,3-dimethyl- (4), 2,3-diphenyl- (6), and 2-methyl-3-phenyl-pyrazine monoxides (8 and 9) with phosphoryl chloride and acetic anhydride resulted in giving monochloro- and monoacetoxy-pyrazines in almost all cases.However, the reaction of 6 with acetic anhydride afforded exceptionally a diacetoxydihydropyrazine.These products were converted further to hydroxy or dichloro derivatives.
- Watahiki, Hiroko,Tsutsui, Mayumi,Akita, Yasuo,Watanabe, Tokuhiro,Kurihara, Teruo
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p. 465 - 473
(2007/10/02)
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