1974 1753Reactivity of the Pyrido[l,2-a]pyrimidin-4-one Ring SystemBy Ghbor Nhray-Szab6,' lstvhn Hermecz, and Zoltiin MBsziiros, CHINOIN Pharmaceutical and ChemicalWorks, Budapest, HungaryThe reactivity of the pharmacologically active pyrido[l,2-a] pyrimidin-4-one ring system has been ...