Synthesis of novel 2‐substituted‐5‐oxycoumarans via A direct route to 2,3‐dihydro‐5‐hydroxy‐2‐benzofuranacetic acids

A number of novel 2-substituted 2,3-dihydro-5-benzofuranols optionally protected on 5-OH group have been prepared via a simple two step route to racemic 2,3-dihydro-5-hydroxy-2-benzofuranacetic acids from hydroquinones and 4-bromocrotonates.