A series of pyprimidinyl compounds of formulae I, II and III; ##STR1## wherein R.sup.1 and R.sup.2 are independently selected from hydrogen and hydroxy; R.sup.3 is selected from hydrogen, hydroxy, or oxo, with the proviso that R.sup.3 can only be oxo when R.sup.1 and R.sup.2 are hydrogen, and further that R.sup.1, R.sup.2, and R.sup.3 cannot all be hydrogen or hydroxy at the same time; and the solid and dotted lines refer to either a double covalent bond or a single covalent bond with another hydrogen atom covalently bonded to the carbon terminus end. The compounds of this invention possess cognition and memory enhancing activity.
一系列的
嘧啶基化合物,其
化学式为I、II和III;其中R.sup.1和R.sup.2分别选自氢和羟基;R.sup.3选自氢、羟基或氧代,但需满足当R.sup.1和R.sup.2为氢时,R.sup.3只能为氧代,且R.sup.1、R.sup.2和R.sup.3不能同时为氢或羟基;实线和虚线分别表示与碳端末端共价键形成的双共价键或单共价键,与另一个氢原子共价键结合。该发明的化合物具有增强认知和记忆的活性。