Multi-Step Synthesis of Benzopyranones (VI) via a Key Step Involving Reaction of the Intermediate Compound (IV) with Phenyltrimethylammonium Tribromide.

Multi-step synthesis of benzopyranones v

Multi-step synthesis of benzopyranones via a key step involving reaction of the intermediate compound with phenyltrimethylammonium tribromide

✍ T. Javed; S. S. Kahlon 📂 Article 📅 2002 🏛 Journal of Heterocyclic Chemistry 🌐 English ⚖ 39 KB

## Abstract Base catalysed condensation of a substituted 2‐hydroxyacetophenone with acetic anhydride and sodium acetate followed by cyclization of the intermediate with acid gave substituted 3‐acetyl‐2‐methyl‐4__H__‐1‐benzopyran‐4‐ones. These were then brominated with phenyltrimethylammonium tribro