New Facile Synthesis of 7‐Hydroxy‐6‐amino‐4‐substituted Benzopyran‐2‐ones

Abstract

A new facile synthesis of 6‐amino‐7‐hydroxy‐4‐substituted benzopyranones is described through the von Pechmann reaction. The yields obtained were high, and the proposed methodology leads to pure products. The selectivity of formation of the desired products can be attributed to the formation of an intramolecular hydrogen bond, which leads to reduced reactivity of the 2‐hydroxyl group.

Keywords:

• Coumarin
• 7‐hydroxy‐6‐amino‐4‐substituted benzopyran‐2‐ones
• von Pechmann reaction