申请人:Research Corporation
公开号:US04183931A1
公开(公告)日:1980-01-15
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。