申请人:Takasago International Corporation
公开号:EP0523904A1
公开(公告)日:1993-01-20
To prepare an azetidin-2-one derivative represented by formula (2):
wherein R⁴ and R⁵ each represents a hydrogen atom, a C1-8 alkyl group optionally substituted with an alkoxy, acyl or alkoxycarbonyl group; R⁶ represents a protective group for an amino group; and R⁷ represents a vinylidene group of formula
or an acetylene group of formula
wherein R² and R³ each represents a hydrogen atom or C1-8 alkyl and R⁸ is C1-8 alkyl corresponding to R² or R³,
the process comprises reacting 1 mole of a propargyl alcohol derivative represented by formula (1):
wherein R² represents C1-6 alkyl or a phenyl group which may be halogen-substituted and R² to R⁷ are as above, with carbon monoxide in the presence of 0·001 to 1 mole of a palladium complex.
The palladium complex can include a ligand (e.g. a trialkyl or triaryl phosphine or trialkyl phosphite) and can be formed in situ from a Pd compound and the ligand in a solvent. Carbon monoxide pressure can be 1-50 atm.
The compound (2), an intermediate of penem antibiotics, is obtained through one reaction step in good yield.
制备式 (2) 所代表的氮杂环丁烷-2-酮衍生物:
其中 R⁴ 和 R⁵ 分别代表氢原子、任选被烷氧基、酰基或烷氧羰基取代的 C1-8 烷基;R⁶ 代表氨基的保护基;以及 R⁷ 代表式(2)的亚乙烯基。
或式
其中 R² 和 R³ 分别代表氢原子或 C1-8 烷基,R⁸ 是与 R² 或 R³ 相对应的 C1-8 烷基、
该工艺包括使 1 摩尔式 (1) 所代表的丙炔醇衍生物发生反应:
其中 R² 代表 C1-6 烷基或可被卤素取代的苯基,R² 至 R⁷ 如上,在 0-001 至 1 摩尔钯络合物存在下与一氧化碳反应。
钯络合物可包括配体(如三烷基或三芳基膦或三烷基亚磷酸酯),并可由钯化合物和配体在溶剂中就地形成。一氧化碳的压力可以是 1-50 atm。
化合物 (2) 是青霉烯抗生素的中间体,只需一个反应步骤即可获得,收率高。