Pyrano[4,3- d]pyrimidinium salts 4. Transformations of 5,7-diaryl-1,3-dimethyl-2,4-dioxo-1 H,3 H-pyrano[4,3- d]pyrimidinium bromides under the action of phenylhydrazines and aromatic acid hydrazides.

Autor: Kostrub, V. V., Tsupak, E. B., Smol'yakov, A. F.
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Zdroj: Russian Chemical Bulletin; Jul2009, Vol. 58 Issue 7, p1469-1475, 7p, 11 Diagrams, 1 Chart
Abstrakt: Reactions of 5,7-diaryl-1,3-dimethyl-2,4-dioxo-1 H,3 H-pyrano[4,3- d]pyrimidinium bromides with phenylhydrazines and aromatic acid hydrazides have been studied. The reaction of the salts indicated with phenylhydrazine at ∼20 °C results in the pyrylium ring opening, whereas elevated temperature leads to recyclization products, i.e., 1,3-dimethylpyrido[4,3- d]pyrimidine-2,4(1 H,3 H)-diones. The reactions of the starting bromides with m-carboxyphenylhydrazine and aromatic acid hydrazides lead to 6-(R-amino)-1,3-dimethyl-2,4-dioxo-1 H,3 H-pyrido[4,3- d]-pyrimidinium salts. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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