indazolium salts
Members of the compound class of 2-amino benzimidates I have very scarcely been described in the literature.
This is in sharp contrast to their isomeric anthranilamides II, which constitute an important family of compounds.
Great interest has been focused on exploring the broad spectrum of biological activities of the latter mentioned compound class, which is reflected in a large number of publications and patents dealing with synthesis, properties, and applications of anthranilamides.
When benzimidates I possess aromatic substituents (Rt=R=Ar) they rearrange thermally at elevated temperatures to their isomeric amides II. This reaction is known as Chapman rearrangement1-5 (Scheme 1).