1. For the first synthesis of six-membered cyclic nitronates 1, see: A. Risaliti, M. Forchiassin, and E. Valentin, Tetrahedron , 24, 1889 (1968).
2. For the synthesis of six-membered cyclic nitronates by the cyclization of δ-halonitro compounds, see: I. E. Chlenov, V. I. Khudak, L. M. Kolymagina, N. S. Morozova, and V. A. Tartakovsky, Izv. AN SSSR, Ser. Khim., 1867 (1970). [Bull. Acad. Sci. USSR, 1757 (1970)].
3. S. E. Denmark and A. Thorarensen, Chem. Rev., 96, 137 (1996).
4. A. Yu Sukhorukov and S. L. Ioffe, Chem. Rev., 111, 5004 (2011).
5. S. L. Ioffe, in: H. Feuer (editor), Nitrile Oxides, Nitrones, and Nitronates in Organic Synthesis: Novel Strategies in Synthesis, 2nd ed., Wiley, Hoboken (2008), p.435.