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A facile and efficient synthetic approach under the catalyst system of Pd(OAc) 2 /KOAc/TBAB/DMF was developed allowing for rapid preparation of 2-arylation derivatives of the natural product tanshinone I. This approach was featured by palladium-catalyzed C–C coupling through direct C sp2 –H activation at the α-position of the furan ring of tanshinone I. Compared to the literature procedures,...
An efficient three-step approach was developed to assemble indole- or benzofuran-fused benzocarbazole-1,4-diones in 42–53% overall yield. This approach includes AgOAc-promoted oxidative cyclization of 2,6-di-bromocyclohexene-1,4-dione with indol-3-ylpropanoid acid, condensation of the resulting bromocarbazole intermediates with phenols or anilines, followed by Pd(OAc)-catalyzed cyclization. Such convenient...
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