| 摘要 |
PURPOSE:To obtain the titled compound useful as a raw material for agricultural chemicals, pharmaceuticals, etc., in high purity and yield, by reacting an easily available compound such as ethyl 2-acetyl-3,3-bis(methylthio)acrylate with an alkylhydrazine or its salt. CONSTITUTION:The objective compound of formula III (e.g. 1,3-dimethyl-4- ethoxycarbonyl-5-methylthiopyrazole) can be produced by reacting the compound of formula I (R1 is H or alkyl; R2 is alkyl; R3 is alkyl or aralkyl) with the compound of formula II (R4 is lower alkyl) (e.g. methylhydrazine) or its salt. The amount of the compound of formula II or its salt is preferably about 1-1.3mol per 1mol of the compound of formula I. EFFECT:The objective compound can be easily produced with simple reaction operation in short reaction step. Accordingly, the present process is extremely useful as an industrial production process.
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