申请人:SHIONOGI & CO., LTD.
公开号:EP0701991A1
公开(公告)日:1996-03-20
A process for preparing a compound represented by the formula
wherein R¹ is a lower alkyl, cycloalkyl, cycloalkyl-lower alkyl, aryl or aralkyl group which is optionally substituted; R² is a group represented by the formula: -COOR': (wherein R' is a lower alkyl or aralkyl which is optionally substituted), lower alkyl, or halogenated lower alkyl, or, R¹ and R², together with adjacent carbonyl group, form a cyclohexanone ring:
R³ is a phenyl group optionally being substituted; and, ring A is a benzene nucleus which is optionally substituted, or a heterocyclic ring containing S or O optionally being substituted; which process is characterized by that a lactone compound represented by the formula:
in which R³ and ring A are as defined above, is allowed to react with a compound of a formula:
in which R¹ and R² are as defined above in the presence of a base, and then the resulting compound is subject to dehydration and compounds used in the process.
一种制备由式表示的化合物的工艺
其中 R¹ 是任选被取代的低级烷基、环烷基、环烷基-低级烷基、芳基或烷基; R² 是由式表示的基团:-COOR':(其中 R'是任选被取代的低级烷基或芳烷基)、低级烷基或卤代低级烷基,或者 R¹ 和 R² 与邻近的羰基一起形成环己酮环:
R³ 是任选被取代的苯基;环 A 是任选被取代的苯核,或任选被取代的含 S 或 O 的杂环;该工艺的特征在于,由式表示的内酯化合物: R³ 是任选被取代的苯基;环 A 是任选被取代的苯核,或任选被取代的含 S 或 O 的杂环:
其中 R³ 和环 A 如上文所定义,可与以下式子的化合物反应:
式中R¹和R²如上所定义,在碱存在下反应,然后将所得化合物脱水,并将化合物用于该工艺中。