An unexpected synthesis of 7-azidofurazano[3,4-b]tetrazolopyrazine
作者:S. Guillou、G. Jacob、F. Terrier、R. Goumont
DOI:10.1016/j.tet.2009.07.065
日期:2009.10
In the course of our program focused on the preparation of high-nitrogen content heterocyclic compounds, we wish to report an original synthesis of the tricyclic 7-azidofurazano[3,4-b]tetrazolopyrazine via an unprecedented reaction between 2,6-dimethoxy-3,5-dinitropyrazine and hydrazine hydrate. This compound was identified by an X-ray diffraction analysis. Further studies of its structure by (15)N and (13)C NMR spectroscopy were carried out in different solvents. This allowed us to observe a noteworthy equilibrium involving three forms resulting from the reversible opening of a tetrazole ring. (c) 2009 Elsevier Ltd. All rights reserved.
Synthesis of 7-Azidofurazano[3,4-b]tetrazolopyrazine and Isomer's Structure in Different Polarity Solvents
作者:Tao Guo、Min Liu、Jun Jiang、Shao-Jun Qiu、Zhong-Xue Ge
DOI:10.14233/ajchem.2013.14164
日期:——
7-Azidofurazano[3,4-b]tetrazolopyrazine (FSZPA) was synthesized via methoxylation, nitration hydrazinolysis and azidation, using 2,6- dichloropyrazine as a starting material. The structures of 7-azidofurazano[3,4-b]tetrazolopyrazine and intermediates were identified by FTIR, NMR and elemental analysis. 15N and 13C NMR spectra showed three isomer forms resulting from the reversible opening and closing between asido and tetrazole depending on polarity of the solvents.