title: Synthesis of 1H-indazoles and 1H-pyrazoles via FeBr3/O2 mediated intramolecular C-H amination.
abstract: A new synthesis of substituted 1H-indazoles and 1H-pyrazoles from arylhydrazones via FeBr(3)/O(2) mediated C-H activation/C-N bond formation reactions is reported. The corresponding 1,3-diaryl-substituted indazoles and trisubstituted pyrazoles were obtained in moderate to excellent yields under mild conditions.
authors.affiliation: Department of Chemistry, Xixi Campus, Zhejiang University, Hangzhou 310028, P. R. China.
authors.forename: Tianshui
authors.initials: T
authors.lastname: Zhang
authors.forename: Weiliang
authors.initials: W
authors.lastname: Bao
mesh_terms: D000586:Amination; D002384:Catalysis; D003500:Cyclization; D006835:Hydrazones / Q000737:chemistry*; D006860:Hydrogen Bonding; D007191:Indazoles / Q000138:chemical synthesis* / Q000737:chemistry*; D011720:Pyrazoles / Q000138:chemical synthesis* / Q000737:chemistry*
chemical_list: D006835:Hydrazones; D007191:Indazoles; D011720:Pyrazoles