Method for preparing saflufenacil intermediate

The invention belongs to the field of synthesis of pesticide compounds, and particularly relates to a method for preparing a saflufenacil intermediate. The method comprises the following steps: 1) reacting 2, 4-dichlorotoluene serving as a raw material to obtain a formula II; 2) synthesizing a compound shown in a formula III from the compound shown in the formula II and the compound shown in the formula IV under an alkaline condition; and 3) synthesizing the compound shown in the formula III through halogenation, hydrolysis and oxidation. According to the present invention, the use of the expensive raw material 2-chloro-4-fluorobenzoic acid is avoided in the process of preparing the compound represented by the formula (I), the cost of the raw material is effectively reduced, the three wastes produced in the process are reduced, the total yield of the reaction is high, and the method is suitable for industrial mass production. 本发明属于农药化合物的合成领域，具体涉及一种制备苯嘧磺草胺中间体的方法。该方法包括：1)以2.4-二氯甲苯为原料反应得到式II；2)式II与式Ⅳ在碱性条件下合成式III