2-Ketoalkyl-4(3H)-quinazolinones of the formula ##STR1## wherein R.sub.1 is an aliphatic, cycloaliphatic or hydrocarbon aromatic group of 1-10 carbon atoms; A is divalent alkylene of 1 to 10 carbon atoms; R.sub.2 is an aliphatic, cycloaliphatic, hydrocarbon aromatic or heterocyclic group of 1-10 carbon atoms formed by condensing an acyl ester of the formula R.sub.2 COOR' which can be dissociated to form --COR.sub.2 and R'OH in which R' is the alcoholic portion of said ester; and R.sub.3 and R.sub.4 are each hydrogen, hydroxy, amino, halogen, trifluoromethyl, alkyl, alkoxy, alkylthio or alkylsulfonyl each of 1-4 carbon atoms, the substituents other than hydrogen when present being preferably in the 6- and/or 7-position of the quinazolinone nucleus provide compounds having useful activity as CNS depressants and anticonvulsants. A process is provided for preparing such compounds by ester condensation of a corresponding 2-alkyl-3-substituted-4(3H) quinazolinone with a condensable ester and excess sodium hydride in the presence of a strong ionization solvent such as refluxing 1,2-dimethoxyethane.
2-
酮烷基-4(3H)-
喹唑啉酮的
化学式为##
STR1##其中R.sub.1是1-10个
碳原子的
脂肪烷基、环
脂肪烷基或
碳氢芳基;A是1至10个
碳原子的二价烷基;R.sub.2是通过缩合具有
化学式R.sub.2 COOR'的酰基
酯形成的1-10个
碳原子的
脂肪烷基、环
脂肪烷基、
碳氢芳基或杂环基,该酰基
酯可以解离形成--COR.sub.2和R'OH,其中R'是所述
酯的醇部分;而R.sub.3和R.sub.4分别是
氢、羟基、
氨基、卤素、三
氟甲基、烷基、烷
氧基、烷
硫基或烷基磺酰基,每种取代基均为1-4个
碳原子,存在时通常位于
喹唑啉酮核的6-和/或7-位置,提供具有作为中枢神经系统
抑制剂和抗惊厥活性的化合物。提供了一种通过
酯缩合制备这类化合物的方法,该方法通过在强离子溶剂的存在下,如回流1,2-
二甲氧基乙烷中,使用相应的2-烷基-3-取代-4(3H)
喹唑啉酮与可缩合
酯和过量的
氢化
钠进行
酯缩合来实现。