Studies on the Fischer indole synthesis: rearrangements of five-, six- and seven-membered cyclic hydrazones of pyrazoline, tetrahydropyridazine and tetrahydro-1,2-diazepine series in polyphosphoric acid
Tiziana Benincori, Elisabetta Brenna, Franco Sannicolò, J. Chem. Soc., Perkin Trans. 1, 1991, (9),2139-2145
DOI: 10.1039/P19910002139
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http://www.rsc.org/ejarchive/P1/1991/P19910002139.pdf