+++Thanks_Commander L_1 article from Springer link

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Facile one-pot synthesis of the pyrazolo[1,5-a]pyrazine scaffold
O. V. Zaremba, N. Yu. Gorobets, S. S. Kovalenko…


Chemistry of Heterocyclic Compounds, September 2013, Volume 49, Issue 6, pp 915-921

DOI:

http://dx.doi.org/10.1007/s10593-013-1326-x

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http://link.springer.com/article/10.1007/s10593-013-1326-x