“…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).…”