An approach to benzannelated [5,6]-spiroketals

Article abstract of DOI:10.1055/s-2008-1078057

Heating a variety of 2-hydroxybenzyl acetates bearing a range functional groups on the 4- or 5-position of the aromatic ring at 100°C in neat γ-methylene-γ-butyrolactone (1.0 M) for 20 hours gives a series of benzannelated [5,6]-spiroketals in 75-89% yiel