Laconde, Guillaume et al. published their research in European Journal of Organic Chemistry in 2019 | CAS: 3326-34-9

5-Amino-3′,6′-dihydroxy-3H-spiro[isobenzofuran-1,9′-xanthen]-3-one (cas: 3326-34-9) belongs to benzofurans derivatives. Many natural or synthetic compounds containing benzofuran skeletons have been found to possess remarkable activity as agrochemicals and pharmaceuticals. Benzofurans have also made significant and distinctive contributions to biology. They exhibit several biological activities that range from antiviral, antimicrobial, antitumor, anti-inflammatory.Computed Properties of C20H13NO5

Unexpected Reactivity of N-Acyl-Benzotriazoles with Aromatic Amines in Acidic Medium (ABAA Reaction) was written by Laconde, Guillaume;Amblard, Muriel;Martinez, Jean. And the article was included in European Journal of Organic Chemistry in 2019.Computed Properties of C20H13NO5 This article mentions the following:

Despite the large number of methods for the synthesis of amides, formation of the amide bond from aromatic amines has always been a challenge for organic chemists due to their weak nucleophile character. The authors describe here a new efficient method of amide formation from N-Acyl-Benzotriazoles and Aromatic Amines (ABAA reaction) including aniline derivatives, in acidic conditions. This reaction is selective for aromatic amines, since aliphatic amines did not react under the same exptl. conditions. Using the ABAA reaction, the authors synthesized a series of aromatic amide compounds including labeled enzyme substrates, in excellent yield. The ABAA reaction also allowed the one-pot synthesis of Nordiazepam, which is a precursor of the anxiolytic Diazepam (Valium). This procedure opens new ways of synthesis of amides from aromatic amines, and of heterocyclic structures. In the experiment, the researchers used many compounds, for example, 5-Amino-3′,6′-dihydroxy-3H-spiro[isobenzofuran-1,9′-xanthen]-3-one (cas: 3326-34-9Computed Properties of C20H13NO5).

5-Amino-3′,6′-dihydroxy-3H-spiro[isobenzofuran-1,9′-xanthen]-3-one (cas: 3326-34-9) belongs to benzofurans derivatives. Many natural or synthetic compounds containing benzofuran skeletons have been found to possess remarkable activity as agrochemicals and pharmaceuticals. Benzofurans have also made significant and distinctive contributions to biology. They exhibit several biological activities that range from antiviral, antimicrobial, antitumor, anti-inflammatory.Computed Properties of C20H13NO5

Referemce:
Benzofuran – Wikipedia,
Benzofuran | C8H6O – PubChem