Chlorabietols A–C, Phloroglucinol-Diterpene Adducts from the Chloranthaceae Plant Chloranthus oldhamii

Three unprecedented phloroglucinol-diterpene adducts, chlorabietols A–C (1–3), were isolated from the roots of the rare Chloranthaceae plant Chloranthus oldhamii. They represent a new class of compounds, featuring an abietane-type diterpenoid coupled with different alkenyl phloroglucinol units by forming a 2,3-dihydrofuran ring. Their structures were elucidated by detailed spectroscopic analysis, molecular modeling studies, and electronic...