PROCESS FOR THE PREPARATION OF AN ANTHRANILIC ACID DERIVATIVE

摘要

The present invention relates to a novel a process for the preparation of a compound of formula (I) which process comprises adding 1 to 2 mol of sodium hypochlorite with a concentration of 8% to 15% by weight to a suspension of the compound of formula (II) in aqueous sodium hydroxide at a temperature of 5 to 60°C, wherein the concentration of sodium hydroxide in the suspension is from 5 to 25 % by weight; and acidifying the reaction mass with concentrated hydrochloric acid to a pH of 1.5 to 2.0 and wherein said process is carried out as a one-pot synthesis without isolation of intermediates.