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Synthesis of pyridazine derivatives—XXVIII

1969; Elsevier BV; Volume: 25; Issue: 16 Linguagem: Inglês

10.1016/s0040-4020(01)82864-7

1464-5416

Branko Stanovnik, M. TIŠLER,

Synthesis and Reactivity of Heterocycles

It has been found that in certain cases azidotetrazolopyridazines can isomerize. 6-Azido-7-methyltetrazolo[1·5-b]pyridazine isomerizes into 6-azido-8-methyltetrazolo[1·5-b]pyridazine by simultaneous ring opening of the tetrazolo ring and cyclization of the azido group. Similarly, 6-azidopyrido-[3·2-d]tetrazolo[5·1-b]pyridazine isomerizes to the thermodynamically more stable 6-azidopyrido[2·3-d]tetrazolo[5·1-b]pyridazine.