Easy to N-cycle: The efficient synthesis of azepine derivatives was achieved by Rh-catalyzed tandem 2,3-rearrangement involving the heterocyclization of N-allenylnitrone intermediates (see scheme; cod=1,5-cyclooctadiene, tppms=sodium diphenylphosphinobenzene-3-sulfonate).
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Nakamura et al. (2012) studied this question.
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