申请人:Takasago International Corporation
公开号:US06340751B1
公开(公告)日:2002-01-22
Disclosed is a process for the preparation of a 4-substituted azetidinone derivative, which comprises reacting an azetidinone derivative and an amide compound in the presence of a magnesium compound such as those represented by the following formulas (II):
and (IV):
represented by the following formula (III):
MgR5R6 (III)
wherein R5 represents a C1-12 alkyl group, a C2-5 alkenyl group, a 5- to 8-membered alicyclic group which may be substituted by a lower C1-4 alkyl group, a phenyl group which may be substituted by a lower C1-4 alkyl group, a lower C1-4 alkoxy group or a halogen atom or a benzyl group which may be substituted by a lower C1-4 alkyl group, a lower C1-4 alkoxy group or a halogen atom, and R6 represents a halogen atom, a methanesulfonyloxy group, a benzenesulfonyloxy group, a p-toluenesulfonyloxy group, a trifluoromethanesulfonyloxy group, an acetoxy group which may be substituted by a halogen atom or a cyano group or an OR7 group (R7 representing a lower C1-4 alkyl group, a substituted or unsubstituted phenyl group or a substituted or unsubstituted benzyl group). The process provides an industrially excellent process for the preparation of a 4-substituted azetidinone derivative which permits the selective preparation of an intermediate for the synthesis of a carbapenem antibacterial agent having a desired 1-&bgr;′ configuration.
揭示了一种制备4-取代氮杂环己酮衍生物的过程,包括在镁化合物的存在下,反应氮杂环己酮衍生物和酰胺化合物,所述镁化合物可由以下公式(II)和(IV)所表示:MgR5R6 (III)其中R5代表C1-12烷基,C2-5烯基,5-至8-成员的脂环基,该脂环基可以被低C1-4烷基取代,苯基,该苯基可以被低C1-4烷基,低C1-4烷氧基或卤素原子取代,苄基,该苄基可以被低C1-4烷基,低C1-4烷氧基或卤素原子取代;R6代表卤素原子,甲磺酰氧基,苯磺酰氧基,对甲苯磺酰氧基,三氟甲磺酰氧基,乙酰氧基,该乙酰氧基可以被卤素原子或氰基或OR7基(R7代表低C1-4烷基,取代或未取代的苯基或取代或未取代的苄基)取代。该过程提供了一种在工业上优秀的制备4-取代氮杂环己酮衍生物的过程,可允许选择性制备用于合成具有所需1-β'构型的碳青霉烯类抗菌剂的中间体。