- AN IMPROVED PROCEDURE FOR THE PREPARATION OF AROMATIC HETEROCYCLIC N-OXIDES
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An improved procedure for the preparation of aromatic heterocyclic N-oxide is described.Nitrogen containing heterocyclic compounds gave their N-oxides in excellent yields by the reaction of m-CPBA in DMF/MeOH in the presence of HF in a short time under mild reaction conditions.The presence of HF and MeOH is crucial for the reaction.
- Rhie, Soo Young,Ryu, Eung K.
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p. 323 - 328
(2007/10/03)
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- Synthesis and antifungal activity evaluation of 3-hydroxyimidazo[1,2-a]pyridine and 3-hydroxyimidazo[1,2-a]pyrimidine derivatives
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A series of 16 imidazo[1,2-a]pyridine and imidazo[1,2-a]pyrimidine derivatives was synthesized and tested on several species for 'in vitro' fungicide activity.
- Rival,Taudou,Ecalle
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p. 857 - 869
(2007/10/02)
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- Synthesis of some pyrimidine N-oxides
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Various monosubstitudes pyrimidines and methylpyrimidines were N-oxidized with a number of different peracids.In general, they are more susceptible to side reactions accompanying N-oxidation (i.e., decomposition, annular carbon oxidation, ring opening) than other ?-deficient diazine and triazine analogs.Unsymmetrical pyrimidines, which can potentially yield two isomeric products, were N-oxidized preferentially at the site para to strong electron-donating substituents.Weaker ringactivating groups, such as methyl, are mainly ortho directing and only aid in the N-oxidation of pyrimidine nuclei having ortho/para-directing substituents.
- Jovanovic, Misa V.
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p. 1176 - 1180
(2007/10/02)
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- SYNTHESES AND TRANSFORMATIONS OF SOME HETEROCYCLIC HYDROXYLAMINES
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Syntheses of some hydroxylaminoazines, their quaternized derivatives or N-oxides and N-amino compounds are described.Several transformations of these compounds and cyclization reactions are presented.
- Tomazic, Alenka,Tisler, Miha,Stanovnik, Branko
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p. 1787 - 1794
(2007/10/02)
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