- Efficient transformation of electron-rich arenes into diethyl 3-arylisoxazole-4,5-dicarboxylates
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Treatment of electron-rich arenes with Tf2O and DMF, followed by the reaction with NH2OH·HCl and then with Oxone in the presence of diethyl acetylenedicarboxylate generated diethyl 3-arylisoxazole-4,5-dicarboxylates in good to modera
- Nakano, Ryuhta,Togo, Hideo
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- Aluminium chloride promoted carbohydroximoylation reaction of aromatic compounds with primary nitroalkanes
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The reaction of primary nitroalkanes with aromatic compounds in the presence of aluminium chloride afforded the corresponding carbohydroximoylated aromatic compounds.
- Kim,Song,Ryu
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p. 1711 - 1715
(2007/10/02)
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- Initial steps in the reductive condensation of trichloromethylarenes with hydroxylamine and hydrazines in pyridine
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Data concerning the initial steps in the reductive condensation of trichloromethylarenes with hydroxylamine or hydrazines in pyridine have been obtained.High yields of the products of the reductive condensation obtained even at equimolar ratios of trichloromethylarene with hydroxylamine or hydrazine as well as the formation of unusual products, i.e., 4-pyridylhydrazones of substituted benzaldehydes, have been interpreted as the results of the participation of pyridine in the reaction as a reductive agent. - Key words: trichloromethylarenes, reductive condensation with hydroxylamine or hydrazines, role of pyridine; 4-pyridylhydrazones of substituted benhaldehydes.
- Belen'kii, L. I.,Poddubnyi, I. S.,Krayushkin, M. M.
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p. 1844 - 1848
(2007/10/02)
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- Reductive condensation of trichloromethylarenes with hydroxylamine and hydrazines in pyridine
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The interaction of trichloromethylarenes with hydroxylamine in pyridine involves the reductive oximation of aryltrichloromethanes. Further transformations of the oximes in the reaction course can result in the formation of nitriles or 3,5-diaryl-1,2,4-oxadiazoles as final products. The conversion depth depends on reaction conditions and structures of trichloromethyl-arenes. When hydrazines used instead of hydroxylamine, respectivebenzaldehyde hydrazones or azines are obtained.
- Belen'kii,Brokhovetskii,Krayushkin
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p. 447 - 456
(2007/10/02)
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