Abstract: A facile synthesis of substituted 1H-indazole 4 from aryl mesylate 3 is described. The reaction, which proceeds through the intermediate hydrazone, was general with regard to the substituents on the arene and was applicable to several hydrazines. It was also discovered that with p-methoxyphenylhydrazine, the indazole formation was more rapid than the competitive Fischer indole synthesis. Key words: 1H-indazole, phenol, mesylate, ...
[Simonetti, Sebastian O.; Larghi, Enrique L.; Bracca, Andrea B. J.; Kaufman, Teodoro S. Organic and Biomolecular Chemistry, 2012 , vol. 10, # 20 p. 4124 - 4134]
