A modified multicomponent Biginelli condensation with Meldrum's acid affords a straightforward access to 5,6-dihydropyrimidin-4-ones through a domino Knoevenagel-aza-Michael-Cyclocondensation (KaMC) reaction.
Researches on Pyrimidines. CXLIX. The Synthesis of Aryl Substituted Dihydrouracils and their Conversion to Uracil Derivatives<sup>1</sup>
作者:Treat B. Johnson、John E. Livak
DOI:10.1021/ja01293a033
日期:1936.2
A New Route to 5,6-Dihydropyrimidin-4(3<i>H</i>)-ones
作者:Lucjan Strekowski、Rebecca A. Watson、Michelle A. Faunce
DOI:10.1055/s-1987-28013
日期:——
The addition reaction of 2,4-bis(methylthio)pyrimidine or 2, 4-dimethoxypyrimidine with organolithium reagents produces unstable 6-substituted 2,4-bis(methylthio)-5,6-dihydropyrimidines and 2, 4-dimethoxy-5,6-dihydropyrimidines, respectively. The regioselective hydrolysis of these addition products gives the respective 6-substituted 2-methylthio-5,6-dihydropyrimidin-4(3H)ones and 6-substituted 2-methoxy-5,6-dihydropyrimidin-4(3H)ones. The methoxy products can be hydrolyzed further to 6-substituted dihydrouracils.