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A practical protocol for the synthesis of dibenzo[ b , e ][1,4]oxazepin-11(5 H )-ones has been developed. By virtue of Pd-catalyzed aminocarbonylation and aromatic nucleophilic substitution, 61 examples of the desired dibenzoxazepinones were obtained in moderate to excellent isolated yields (54–92%).
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Shen et al. (2015) studied this question.
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