1, 2, 3??Triazolo [4, 5??e]??1, 2, 4??triazolo [3, 4??c] pyrimidines

…, I Giorgi, O Livi, C Manera, V Scartoni

Index: Biagi, Giuliana; Giorgi, Irene; Livi, Oreste; Manera, Clementina; Scartoni, Valerio Journal of Heterocyclic Chemistry, 1999 , vol. 36, # 5 p. 1195 - 1198

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Citation Number: 9

Abstract

Abstract Some new 1, 2, 3-triazolo [4, 5-e]-1, 2, 4-triazolo [3, 4-c] pyrimidmes were prepared starting from the corresponding 1, 2, 3-triazolo [4, 5-d] pyrimidines via the formation of the 1, 2, 4-triazole ring. Thus suitable hydrazino derivatives 6 were condensed with triethyl orthoformate, triethyl orthoacetate and triethyl orthobenzoate to give the expected tricyclic derivatives 7, 8 and 9. Intramolecular cyclization of the ethoxycarbonylhydrazino ...