申请人:Takasago International Corporation
公开号:US05322939A1
公开(公告)日:1994-06-21
A process for preparing an azetidin-2-one derivative represented by formula (2): ##STR1## wherein R.sup.4 and R.sup.5, which may be the same or different, each represents a hydrogen atom, an alkyl group having from 1 to 8 carbon atoms, or an alkyl group having from 1 to 8 carbon atoms substituted with an alkoxy group, an acyl group, or an alkoxycarbonyl group; R.sup.6 represents a protective group for an amino group; and R.sup.7 represents a vinylidene group of formula ##STR2## or an acetylene group of formula ##STR3## wherein R.sup.2 and R.sup.3, which may be the same or different, each represents a hydrogen atom or an alkyl group having from 1 to 8 carbon atoms; and R.sup.8 represents an alkyl group having from 1 to 8 carbon atoms corresponding to R.sup.2 or R.sup.3, which comprises reacting a propargyl alcohol derivative represented by formula (1): ##STR4## wherein R.sup.1 represents an alkyl group having from 1 to 6 carbon atoms, a phenyl group, or a halogen-substituted phenyl group; R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6 and R.sup.7 are as defined above, with carbon monoxide in the presence of a palladium complex. The compound (2), an intermediate of penem antibiotics, can be obtained through one reaction step in good yield.
制备一种由公式(2)表示的氮杂环丙酮衍生物的方法:##STR1##其中,R.sup.4和R.sup.5可以相同也可以不同,分别表示氢原子,具有1至8个碳原子的烷基或具有1至8个碳原子的烷基取代的烷氧基、酰基或烷氧羰基;R.sup.6表示氨基的保护基;R.sup.7表示公式##STR2##的乙烯基或公式##STR3##的乙炔基,其中R.sup.2和R.sup.3可以相同也可以不同,分别表示氢原子或具有1至8个碳原子的烷基;R.sup.8表示与R.sup.2或R.sup.3相应的具有1至8个碳原子的烷基,包括将由公式(1)表示的丙炔醇衍生物与一种钯配合物在一氧化碳存在下反应。化合物(2)是青霉烷类抗生素的中间体,可以通过一步反应以良好的产率得到。