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A novel and efficient ytterbium promoted reductive cyclisation dimerization of α-bromo-oxime ethers affording 2,4-diarylpyrroles with high regioselectivity has been developed. Compared with the reported synthesis methods, the method has the following advantages: readily available and safe starting material, one-pot single step operation and mild and neutral reaction conditions.

Ytterbium-mediated synthesis of 2,4-diarylpyrroles from α-bromo oxime ethers