Process for the preparation of optically active 4-oxo-1-benzopyran-2-carboxylic acid derivatives and intermediates thereof
申请人:SANWA KAGAKU KENKYUSHO CO., LTD.
公开号:EP0331078A2
公开(公告)日:1989-09-06
process for the preparation of optically active 4-oxo-1-benzopyran-2-carboxylic acid derivatives of the formula
wherein X and Y are hydrogen atom, halogen atom or alkyl group, and R1 is hydrogen atom or alkyl group, intermediates thereof, as well as a process for the preparation of the intermediates.
式中 X 和 Y 为氢原子、卤素原子或烷基,R1 为氢原子或烷基的光学活性 4-氧代-1-苯并吡喃-2-羧酸衍生物的制备工艺,以及其中间体的制备工艺。
其中 X 和 Y 为氢原子、卤素原子或烷基,R1 为氢原子或烷基)的光学活性 4-氧代-1-苯并吡喃-2-羧酸衍生物及其中间体的制备方法。