| 摘要 |
PURPOSE:To obtain a cyclohexenone compound useful as an intermediate for agricultural chemicals and medicines in high yield in one pot by using a specific catalyst. CONSTITUTION:The compound of formula I(R<1> to R<3> are lower alkyl), e.g. 2-methoxy-4-methoxycarbonyl-3-methyl-2-cyclohexen-1-one. This compound is obtained by reacting a compound of formula II (R<4> is lower alkyl) with a compound of formula III in the presence of a zinc compound as a catalyst. Inorganic zinc compounds such as ZnCl2, ZnO or basic zinc carbonate, organozinc compounds such as Zn(CH3COO)2 or zinc benzoate and zinc dust, etc., are employed as the zinc compound and used in an amount of preferably 0.1-0.3mol based on 1mol compound of formula II. |
