申请人:Bayer Aktiengesellschaft & Chinese
公开号:US04803285A1
公开(公告)日:1989-02-07
A process for the preparation of a C(3)-C(4)-transconfigurated.gamma.-butyrolactam of the formula (I) ##STR1## in which R.sup.1 represents hydrogen or alkyl, aryl or aralkyl with in each case up to 10 carbon atoms and R.sup.2 and R.sup.3 are identical or different and represent hydrogen, alkyl, aryl, aralkyl, alkoxy, aryloxy or aralkoxy with in each case up to 10 carbon atoms, acyl with up to 18 carbon atoms, trifluoromethyl, trifluoromethoxy, nitro, hydroxyl, halogen, amino, carboxyl, sulpho, dialkylamino with up to 4 carbon atoms in the alkyl groups or acylamino with up to 18 carbon atoms, in the form of their isomers, isomer mixtures, racemates or optical antipodes, comprising oxidizing a compound of the formula (II) ##STR2## in which R.sup.1, R.sup.2 and R.sup.3 have the above-mentioned meanings, in an inert organic solvent in the presence of a base. Such .gamma.-butyrolactams have an antiamnesic action.
一种制备式(I)的C(3)-C(4)-反构化γ-丁内酰乳酸酯的方法,其中R.sup.1表示氢或烷基,芳基或芳基烷基,每种情况下碳原子数最多为10,而R.sup.2和R.sup.3相同或不同,表示氢,烷基,芳基,芳基烷基,烷氧基,芳氧基或芳基烷氧基,每种情况下碳原子数最多为10,酰基具有最多18个碳原子,三氟甲基,三氟甲氧基,硝基,羟基,卤素,氨基,羧基,磺酰基,烷基基团中最多有4个碳原子或酰胺基具有最多18个碳原子,以其异构体,异构体混合物,外消旋体或光学对映体的形式存在,包括在惰性有机溶剂中在碱存在下氧化式(II)的化合物。这种γ-丁内酰乳酸酯具有抗失忆作用。