2 反应实例
3 参考文献
[1] L. Knorr, Ber., 1884, 17, 1635; Ann., 1886, 236, 290.
[2] L. Knorr and H. Lange, Ber., 1902, 35,2998.
[3] A. H. Corwin, R. C. Elderfield, Heterocyciic Compounds 1, 287 (New York, 1950)
[4] H. Fischer, Organic Syntheses coll. Wool., 1955, 3, 573.
[5] A. Albert, Heterocyclic Chemistry, p 179 (London, 1959)