Disclosed herein is a method of preparing N-acyl anthranilamide (I), including: reacting a substituted anthranilic acid (II) with pyrazolecarboxylic acid (III) under the action of a phosphorus reagent and a base to obtain an intermediate benzoxazinone (IV); and subjecting the intermediate benzoxazinone(IV) and a protonic acid salt of methylamine to a ring-opening reaction to obtain N-acyl anthranilamide (I), as shown in the following reaction scheme:
where X is hydrogen, chloro or cyano group; and HY is hydrohalic acid, sulfuric acid, phosphoric acid or a carboxylic acid. The method has the advantages of simple operation, mild reaction conditions, less waste and high overall yield, and thus is suitable for industrial production.
本文公开了一种制备 N-酰基
蒽酰胺(I)的方法,包括在
磷试剂和碱的作用下,使取代的
蒽酸(II)与
吡唑羧酸(III)反应,得到中间体苯并噁嗪酮(IV);将中间体苯并噁嗪酮(IV)和
甲胺的质子酸盐进行开环反应,得到N-酰基
蒽酰胺(I),如以下反应方案所示:
其中 X 为氢、
氯或
氰基;HY 为氢卤酸、
硫酸、
磷酸或
羧酸。该方法具有操作简单、反应条件温和、浪费少、总收率高等优点,因此适合工业化生产。