Preparation of compounds of the formula: ##STR1## wherein n is 1, 2 or 3, R.sub.1 and R.sub.2, which may be the same or different, are hydrogen or alkyl containing 1 to 3 carbon atoms and the asterisk indicates the center of asymmetry of the molecule, and compounds of the formula ##STR2## wherein R" is a saturated or unsaturated aliphatic hydrocarbon containing 1 to 6 carbon atoms, R.sub.3 is hydrogen or acyl containing 1 to 7 carbon atoms and the asterisk indicates the center of asymmetry of the molecule. The compounds produced by the present invention improve learning memory and display a protecting effect against the E.E.G. consequence of an overdose of barbiturates and against the reduced performance following brain damage (e.g. cerebral edema).
制备公式为:##STR1## 其中n为1、2或3,R.sub.1和R.sub.2可能相同也可能不同,是氢或含有1至3个碳原子的烷基,星号表示分子的不对称中心,以及公式为##STR2## 其中R"为含有1至6个碳原子的饱和或不饱和脂肪烃,R.sub.3为氢或含有1至7个碳原子的酰基,星号表示分子的不对称中心。本发明制备的化合物改善学习记忆,并显示出对
巴比妥类药物过量引起的脑电图异常和脑损伤后性能下降(如脑
水肿)的保护作用。