Synthesis of substituted phenols via photoaddition-fragmentation-aromatic annelation sequence

Article abstract of DOI:10.1016/0040-4039(96)00083-4

Intramolecular photocycloaddition reaction of dihydro-4-pyrones to alkenes (1), followed by fragmentation then subsequent aromatic annelation, carried out by two alternative methods, has been performed efficiently. The sequence provides a convenient method for the construction of substituted phenols fused to aliphatic ring (4).