Method for Preparing Indigo or Substituted Derivative

ChangeBridge: Patent Apps - Organic Chemistry (C07D)

Published March 26th, 2026

Detected March 26th, 2026

Summary

The USPTO has published a patent application (US20260085042A1) detailing a method for synthesizing indigo or substituted derivatives. The application, filed on June 16, 2023, describes a process involving anthranilic acid and glyoxylic acid under hydrogenation with a metal catalyst.

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What changed

This document is a published patent application from the USPTO for a method of preparing indigo or substituted derivatives. The application, filed under number 18875479, describes a synthesis process involving anthranilic acid, glyoxylic acid, hydrogenation, and a metal catalyst. The application was published on March 26, 2026.

As this is a patent application, it does not impose direct regulatory obligations or compliance deadlines on regulated entities. However, companies involved in chemical manufacturing, particularly dyes and organic synthesis, should be aware of this intellectual property filing. It may impact future product development, licensing opportunities, or competitive landscapes within the industry.

Source document (simplified)

← USPTO Patent Applications

METHOD FOR PREPARING INDIGO OR A SUBSTITUTED DERIVATIVE THEREOF

Application US20260085042A1 Kind: A1 Mar 26, 2026

Inventors

Filipe GOMES, Océane CHEVRON, Kevin COTTET, Guillaume BOISSONNAT, Debora VILONA, Cyril BOSSET, Vivien HENRYON

Abstract

A method for the synthesis of dyes is described. More particularly, a method is described for preparing indigo, optionally substituted, that includes reacting anthranilic acid, optionally substituted, with glyoxylic acid under hydrogenation in the presence of a metal catalyst in a solvent, to obtain 2-(carboxymethylamino)benzoic acid, optionally substituted, and conversion of the latter to indigo, optionally substituted.