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    • 9. 发明授权
    • Substituted acetoxyazetidinone derivatives and process for preparing
4-acyloxyazetidinone derivatives
    • 取代的乙酰氧基氮杂环丁酮衍生物和制备4-酰氧基氮杂环丁酮衍生物的方法
    • US5606052A
    • 1997-02-25
    • US436812
    • 1995-05-08
    • Takao SaitoHidenori KumobayashiShunichi Murahashi
    • Takao SaitoHidenori KumobayashiShunichi Murahashi
    • B01J27/128B01J31/12B01J31/30C07B61/00C07D205/08C07F7/18
    • C07F7/186C07D205/08C07F7/1892
    • A process for preparing a 4-acyloxyazetidinone or a derivative thereof represented by formula (IV): ##STR1## wherein R.sup.1 represents a hydrogen atom, a lower alkyl group, a hydroxyethyl group, or a protected hydroxyethyl group; R.sup.3 represents an alkyl group having from 1 to 10 carbon atoms which may be substituted with a halogen atom, a cyano group, a lower alkoxy group or a phenyl group, or a substituted or unsubstituted phenyl group, provided that the .alpha.-positioned carbon atom of said alkyl group should not have more than two halogen atoms; and R.sup.4 represents a hydrogen atom, a lower alkyl group, or a lower alkoxycarbonyl group, which is useful as an intermediate for penem antibiotics is disclosed, comprising reacting azetidinone or a derivative thereof represented by formula (II): ##STR2## wherein R.sup.1 is as defined above, and R.sup.2 represents a hydrogen atom, a lower alkyl group, a lower alkoxycarbonyl group, or a carboxyl group, with a carboxylic acid represented by formula (III):R.sup.3 COOH (III)wherein R.sup.3 is as defined above, in the presence of (1) a transition metal compound selected from a ruthenium compound, an osmium compound, and a cobalt compound, (2) an aldehyde having 2 or more carbon atoms, provided that the carbon atom at the .alpha.-position thereof should not have two or more halogen atoms, and (3) oxygen. The compound (IV) can be prepared with safety through simple and easy operations.
    • 制备由式(Ⅳ)表示的4-酰氧基氮杂环丁酮或其衍生物的方法:原子,低级烷基,羟乙基或被保护的羟乙基; R3表示可以被卤素原子,氰基,低级烷氧基或苯基取代的具有1至10个碳原子的烷基或取代或未取代的苯基,条件是α-位置的碳原子 的所述烷基不应具有多于两个的卤素原子; 其中R 4表示可用作Penem抗生素中间体的氢原子,低级烷基或低级烷氧基羰基,包括使由式(II)表示的氮杂环丁酮或其衍生物: 其中R 1如上所定义,R 2表示氢原子,低级烷基,低级烷氧基羰基或羧基,与式(III)表示的羧酸:R3COOH(III)其中R3如上定义 在(1)选自钌化合物,锇化合物和钴化合物的过渡金属化合物的存在下,(2)具有2个或更多个碳原子的醛,条件是其α位上的碳原子 不应该有两个或更多的卤素原子,和(3)氧。 化合物(IV)可以通过简单和容易的操作安全地制备。