R.C. Bansal, A.W. McCulloch, and A.G. McInnes. Influence of Lewis acids on the Diels–Alder reaction. Part I. An improved synthesis of 7-azanorbornadiene, 3-azaquadricyclane, and azepine derivatives.
Can. J. Chem./Rev. can. chim. 47(13): 2391-2394 (1969)
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