| 摘要 |
A method for producing a compound represented by general formula [8] which comprises reacting a compound represented by general formula [2] by any one of (method 1), (method 2) or (method 3) to obtain a compound represented by general formula [1], then reacting the compound represented by general formula [1] with a base E (base E is an organic base or an inorganic base). In each formula, R1, R2, R3 and R4 are as defined in the specification. |
