2-Pyrazolines and 2-isoxazolines are prepared by the reaction of araldehyde hydrazones and araldoximes with bifunctional olefins in the presence of chloramine-T, which also functions as a reagent for aromatization of the former.
References
1.
GrundmannC., and GrunangerP., in The Nitrile Oxide, Springer Verlag, New York, 1971; P. Caramella and P. Grunanger, in 1,3-Dipolar Cycloaddition Chemistry, ed. A. Padwa, Wiley-Interscience, New York, 1984, vol. 1, p. 337; P. Wade, in Comprehensive Organic Synthesis, ed. M. F. Semmelhack, Pergamon Press, New York, 1991, vol. 4, pp. 1069, 1111; V. Jaeger, Lect. Heterocycl. Chem., 1985, 8, 79.
2.
JustG., and DahlK., Tetrahedron, 1968, 245251.
3.
RaiK. M. L., LigannaN., HassnerA., and MurthyC. A., Org. Prep. Proced. Int., 1992, 24, 91.
4.
KhimJ. N., and RyuE. K., Synth. Commun., 1990, 20, 1373.
