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Beilstein J. Org. Chem. 2019, 15, 1575–1580, doi:10.3762/bjoc.15.161
Graphical Abstract
Scheme 1: Synthetic pathway of 9-O-R BBR.
Scheme 2: Resonance of berberrubine leading to the failure of direct BBRB cross coupling.
Scheme 3: 9-O-Aryl berberine scope via cross-coupling reaction.
Scheme 4: 9-O-Ph-linked berberine dimer through double cross-coupling reaction.