Sur les possibilites de formation de pyrimidines a partir de la dibromo-3,4 dihydro-3,4 coumarine.
作者:KANAME TAKAGI、HIKARI MORITA、KATSUHIKO NAGAHARA、ATSUSHI TAKADA
DOI:10.1248/cpb.30.4526
日期:——
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.
3,4-二溴-3,4-二氢香豆素(3)与乙脒和苯甲脒反应,得到 6-(2-羟基苯基)-4-氧代-3,4-二氢嘧啶(1a 和 1b),其 2-位分别具有甲基和苯基取代基。在这些反应中,香豆素 3 首先转化为 3-溴香豆素(4),然后转化为嘧啶 1a 和 1b。香豆素 4 没有与酰胺发生珀金重排反应。