A process for producing a 4-substituted azetidinone derivative represented by the following general formula [III]:
(wherein OR is a protected hydroxy group, Y is an alkyl group, an alkoxy group, a silyloxy group, a carbamoyloxy group, an amino group, a substituted or unsubstituted aromatic group or a substituted or unsubstituted heterocyclic group, and n is an integer of 0 or 1, provided that n does not represent O when Y is an alkoxy group, silyloxy group, carbamoyloxy group or amino group), characterized in that a 2-azetidinone derivative represented by the following general formula [I]:
(wherein OR is as defined above, and X is an alkyl group or a substituted or unsubstituted aromatic group) is reacted with thiocarboxylic acid represented by the following general formula [II]:
HSCO-(CH₂)n-Y [II]
(wherein Y and n are respectively as defined above) in an organic solvent in the presence of copper compounds.
The aforementioned method can shorten the production process compared with the prior method. It is also highly advantageous from an industrial point of view because it does not employ mercury salts.
一种生产由以下通式[III]表示的 4-取代的氮杂
环丁酮衍
生物的工艺:
(其中OR是受保护的羟基,Y是烷基、烷氧基、
硅烷氧基、
氨基甲酰基、
氨基、取代或未取代的芳香族基团或取代或未取代的杂环基团,n是0或1的整数,但当Y是烷氧基、
硅烷氧基、
氨基甲酰基或
氨基时,n不代表O),其特征在于由下式通式[Ⅰ]表示的
2-氮杂环丁酮衍
生物:
(其中 OR 如上定义,X 为烷基或取代或未取代的芳香基)与以下通式[II]代表的
硫代
羧酸反应:
HSCO-(CH₂)n-Y [II].
(其中 Y 和 n 分别如上文所定义)在有机溶剂中,在
铜化合物的存在下生成。
与之前的方法相比,上述方法可以缩短生产流程。从工业角度来看,这种方法也非常有利,因为它不需要使用
汞盐。