2005
DOI: 10.1002/jhet.5570420309
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Cyclizations to new azolopyridazines and related ring systems

Abstract: In the course of our recent synthetic activity in the area of ring closure reactions we have found that relatively little had been published on azolopyridazines and related compounds, and this circumstance prompted us to explore novel pathways to such ring systems. In the present short review three such approaches from our laboratory leading to various fused azoles are discussed.

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Cited by 3 publications
(1 citation statement)
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“…Treatment of 1H- [1][2][3]triazolo[1,5-a]benzimidazole 351 with dimethyl sulfate at elevated temperature results in the formation of benzimidazolyl-1H-indazole 354 [305]. Instead of the simple methylation to yield 352, a ring opening reaction take place and, via formation of a nitrenium cation, indazole 353 is formed (Scheme 8.109).…”
Section: Other Synthetic Methodsmentioning
confidence: 99%
“…Treatment of 1H- [1][2][3]triazolo[1,5-a]benzimidazole 351 with dimethyl sulfate at elevated temperature results in the formation of benzimidazolyl-1H-indazole 354 [305]. Instead of the simple methylation to yield 352, a ring opening reaction take place and, via formation of a nitrenium cation, indazole 353 is formed (Scheme 8.109).…”
Section: Other Synthetic Methodsmentioning
confidence: 99%