申请人:SHOWA DENKO KABUSHIKI KAISHA
公开号:EP0947512A1
公开(公告)日:1999-10-06
The present invention intends to provide a method for producing 3-isochromanones represented by formula (II) useful as a synthetic starting material of medicals or agricultural chemicals and the cyano compound represented by formula (I) by an industrially advantageous method in a high yield.
Disclosed herein is a method for manufacturing a 3-isochromanone represented by the following formula (II):
(wherein R2, R3, R4 and R5 each independently represents a hydrogen atom, a halogen atom, an alkyl group or an alkoxy group),
said method is characterized by comprising the steps of:
hydrolyzing a cyano compound represented by formula (I):
(wherein R1 represents a hydrogen atom, an alkyl group or an aryl group, and R2, R3, R4 and R5 have the same meanings as defined above) and subjecting the hydrolyzate to intramolecular cyclization.
本发明旨在提供一种方法,以工业上有利的方法高产率地生产由式(II)代表的3-异色酮,该异色酮可用作医用或农用化学品的合成起始原料,以及由式(I)代表的氰基化合物。
本发明公开了一种制造下式(II)代表的 3-异色酮的方法:
(其中 R2、R3、R4 和 R5 各自独立地代表氢原子、卤素原子、烷基或烷氧基)、
所述方法的特征在于包括以下步骤:
水解式 (I) 所代表的氰基化合物:
(其中 R1 代表氢原子、烷基或芳基,R2、R3、R4 和 R5 的含义与上文所定义的相同),并使水解产物进行分子内环化。