Reaction of the title compound with hydrazine in the presence of air gives the 1-unsubstituted parent system via oxidative dehydrazination of the 1-hydrazino intermediate. The latter can be obtained in high yield by carrying out the hydrazinolysis step under inert gas, and it is smoothly converted into [1,2,4]-triazolo[4',3':1,6]pyridazino[4,5- b]indoles.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6147308PMC
http://dx.doi.org/10.3390/91000849DOI Listing

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