1. Synthesis of a new bridgehead nitrogen heterocyclic system. Pyrrolo [2,1-f]-1,2,4-triazine derivatives
2. a Previously an example of this ring system 3 was reported by V. A. Chuiguk and G. M. Golubshina, U.S.S.R Patent 407,903.
3. Chem. Abstr., 80, 9001b (1974).
4. V. A. Nuiguk, G. M. Golubshina, I. P. Bachkovskii and K. V. Fedotov, Tezisy Dokl., Simp. Khim. Tekhnol. Geterosikl. Soedin. Goryuch. Iskop., 2nd., 17 (1933).
5. Chem. Abstr., 85, 144683e (1976).