申请人:THE UNIVERSITY OF NOTRE DAME DU LAC
公开号:EP0256763A1
公开(公告)日:1988-02-24
A process for 4-halomethylazetidin-2-ones is provided which comprises mixing in an inert solvent a positive halogen reagent in the presence of a weak base with a β,γ-unsaturated O-acylhydroxamate of the formula
wherein R is protected amino, lower alkyl or phenyl substituted lower alkyl, R2 is a substituent such as lower alkyl which may be substituted by formyl, hydroxy, halogen, etc., and R1 is alkoxy, benzyloxy, etc. When R is a protected amino group, the process provides cis-4-halomethylazetidin-2-ones, while when R is alkyl or phenylalkyl, the trans isomer is obtained. The 4-halomethylazetidinones are useful intermediates for known antibiotic compounds.
本发明提供了一种 4-卤代甲基氮杂环丁烷-2-酮的工艺,包括在惰性溶剂中,在弱碱存在下,将正卤试剂与式中β,γ-不饱和 O-酰基羟肟酸酯混合
其中 R 是受保护的氨基、低级烷基或苯基取代的低级烷基,R2 是取代基,例如可被甲酰基、羟基、卤素等取代的低级烷基,R1 是烷氧基、苄氧基等。当 R 为受保护的氨基时,该工艺可得到顺式-4-卤甲基氮杂环丁烷-2-酮,而当 R 为烷基或苯基烷基时,则可得到反式异构体。4-Halomethylazetidinones 是已知抗生素化合物的有用中间体。