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Thermal 1,5‐sigmatropic rearrangements of one of the methyl group attached at position 3 of 3,3‐dimethyl‐3H‐pyrazolo[3,4‐d]pyridazin‐4(5H)‐ones 1–3 taking place either in a clock‐wise or anti‐clockwise direction gave N2‐methylated products 4–6 and C3a‐methylated products 7–9. The ‐7(6)‐one derivative 10 and ‐4,7(5H,6H)‐dione derivative 12 gave only N2‐methylated products 11 and 13 respectively, and 1,2‐dihydro derivative 14 produced after elimination of methane, 15.
1,3-Dipolar Cycloadditions of Diazoalkanes to Pyridazine Derivatives. Thermal 1,5-Sigmatropic Rearrangement of Methyl Groups in 3,3-Dimethyl-3H-pyrazolo(3,4-d)pyridazine Derivatives. --(STANOVNIK, B.; JELEN, B.; STIMAC, A.; TISLER, M.; J. Heterocycl.
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
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