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The combination of choline chloride and urea as a deep eutectic solvent has been applied to the synthesis of benzo-fused seven-membered heterocycles, including tricyclic 1,4-benzodiazepines and 1,4-benzoxazepines, via a one-pot, three-component reaction. The reaction conditions are relatively mild and do not require additional metals, acid catalysts, or organic solvents. The protocol has the advantages...
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