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A wide range of fused 2-amino-imidazoles and 2-amino-benzoxazoles can be prepared in one-pot under very mild conditions from 1,2-diamino-arenes or 2-amino-phenols and Vilsmeier reagents. The oxidation proceeds using diacetoxy-iodobenzene (DIB) and is tolerant to different functionalities.
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Jean‐Christophe Andrez (2012) studied this question.
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