Conversion of diacetyl-C-(β-D-glucopyranosyl)phloroglucinol to spiroketal compounds
Diacetyl-C-(β-D-glucopyranosyl)phloroglucinol was converted by refluxing in water to spiro(benzofuran-[2H]furan) a new compound, along with spiro(benzofuran-[2H]pyran). The stereochemistry of the quaternary carbon of both spiro compounds had an S-configuration.