申请人:Takasago International Corporation
公开号:US05288862A1
公开(公告)日:1994-02-22
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.
本发明涉及一种制备4-酰氧吖唑啉酮或其衍
生物的方法,其表示为式(IV):
其中R.sup.1代表氢原子、较低的烷基、羟乙基或保护的羟乙基;R.sup.3代表具有1至10个碳原子的烷基,可以用卤原子、
氰基、较低的烷氧基或苯基取代,或取代或未取代的苯基,但应注意所述烷基的α位碳原子不应有两个以上的卤原子;R.sup.4代表氢原子、较低的烷基或较低的烷氧羰基,在制备
青霉素类抗生素的中间体方面有用。该方法包括将由式(II)表示的吖唑啉酮或其衍
生物与由式(III)表示的
羧酸在(1)选择自
钌化合物、
锇化合物和
钴化合物的过渡
金属化合物、(2)具有2个或更多碳原子的醛,但其α位碳原子不应有两个或更多卤原子,以及(3)氧的存在下反应。化合物(IV)可以通过简单易行的操作安全地制备。