A new catalytic Cu(II)/sparteine system has been developed to promote , -phenolic couplings of styrenyl phenols en route to carpanone and related unnatural congeners in yields exceeding 85%. Benzoxanthenones are a class of lignan natural products, exemplified by a highly oxygenated tetracyclic ring system with four to five contiguous stereocenters, isolated as single diastereomers. Notable memb...
