Sur les possibilites de formation de pyrimidines a partir de la dibromo-3,4 dihydro-3,4 coumarine.

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Reactions of 3, 4-dibromo-3, 4-dihydrocoumarin (3) with acetamidine and benzamidine gave 6-(2-hydroxyphenyl)-4-oxo-3, 4-dihydropyrimidines (1a and 1b) having in the 2-position the methyl and phenyl substituents, respectively. In these reactions, the coumarin 3 was converted in the first place into 3-bromocoumarin (4) which was then transformed to the pyrimidines 1a and 1b. The coumarin 4 did not undergo the Perkin rearrangement with amidines.

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