Заранее спасибо!
1.R. H. Good, Gurnos Jones and J. R. PhippsSyntheses with isoxazoles. Part II. Rearrangement of isoxazolo[2,3-a]-pyridinium salts into 5,6-dihydro-4H-furo[3,2-b]pyridin-2-ones
Journal of the Chemical Society, Perkin Transactions 1
1972; 2441 – 2445
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http://dx.doi.org/10.1039/P19720002441
Bridgehead nitrogen heterocycles. Synthesis of [1,2,4]triazolo[1,5-a]pyridin-1-ium and pyrido[2,1-f][1,2,4]triazin-9-ium derivatives
Journal of the Chemical Society, Perkin Transactions 1
7; 1983; 1395 - 1399;
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http://dx.doi.org/10.1039/P19830001395