Transformations of 2-Aminopyrimidines and Their N-Oxides under Diazotation Conditions
The diazotation of 2-aminopyrimidines and their N-oxides in solutions with various acidities was studied.It is shown that the amino group in pyrimidine N-oxides is not diazotized in strongly acidic media and that bromination in the 5 position of the pyrimidine ring is observed in concentrated hydrobromic acid.When the reaction was carried out in moderately acidic media, it was possible to synthesize the difficult-to-obtain 2-halopyrimidine N-oxides.
Sedova, V. F.,Mustafina, T. Yu.,Krivopalov, V. P.,Mamaev, V. P.
p. 91 - 94
(2007/10/02)
Reaction of Substituted 4-Phenylpyrimidine 1,3-Dioxides with Phosphorus Oxychloride
2-Chloropyrimidine 1-oxides are formed in the reaction of substituted 4-phenylpyrimidine 1,3-dioxides with phosphorus oxychloride; in addtition, 2,4-dichloropyrimidines and 3-phenylisoxazoles were isolated.
Tikhonov, A. Ya.,Sedova, V. F.,Volodarskii, L. B.,Mamaev, V. P.
p. 383 - 386
(2007/10/02)
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