Controlled reduction of pyrimidin(e)-2(1H)-ones and -thiones with metal hydride complexes. Regioselective preparation of dihydro- and tetrahydro-pyrimidin-2(1H)-ones and the corresponding thiones
作者:Choji Kashima、Akira Katoh、Yuko Yokota、Yoshimori Omote
DOI:10.1039/p19810001622
日期:——
6-Trisubstituted pyrimidin-2(1H)-ones were easily reduced with sodium borohydride to give mixtures of 3-aryl-3,4-dihydro-, 1-aryl-3,4-dihydro-, and 3,4,5,6-tetrahydro-pyrimidin-2(1H)-ones. The ratio of the three products was dramatically dependent on the reaction conditions and on the nature of the 4- and 6-substituents in the pyrimidine ring. The reaction with lithium aluminium hydride is also discussed.
1,4,6-三取代的嘧啶-2(1 H)-很容易用硼氢化钠还原,得到3-芳基-3,4-二氢-,1-芳基-3,4-二氢和3的混合物,4,5,6-四氢嘧啶-2(1 H)-ones。三种产物的比例极大地取决于反应条件以及嘧啶环中4-和6-取代基的性质。还讨论了与氢化锂铝的反应。