A Tri-O-Bridged Diels-Alder Adduct from Cortex Mori Radicis
Sanggenon X, an unusual tri-O-bridged Diels-Alder adduct, was isolated from Cortex Mori Radicis.Its structure was established by spectroscopic analysis, including NMR and HR-MS (High Resolution Mass 910-005270 Spectrometry).Sanggenon X contained three O-bridged rings, where the oxygenated bridgeheads were all quaternary carbons.Chemical methylation