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Synthesis of azepines

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Polyethylene glycol (PEG) is an inexpensive nontoxic and effective medium for the one-pot synthesis of N-substituted azepines under catalyst-free conditions in excellent yields. Environmental acceptability, low cost, high yields, and recyclability of the PEG are the important features of this protocol.
R. Mallepalli, L. Yeramanchi, R. Bantu, L. Nagarpu, Synlett, 2011, 2730-2732.