title: Synthesis of Fluorescent Indazoles by Palladium-Catalyzed Benzannulation of Pyrazoles with Alkynes.
abstract: The synthesis of indazoles from pyrazoles and internal alkynes is described. Instead of complex benzenoid compounds, readily available pyrazoles were used for the preparation of indazoles by reaction of the C-H bonds of the heterocyclic ring. Oxidative benzannulation was also applied to imidazoles, providing benzimidazoles. This convergent strategy enabled alteration of the photochemical properties of benzo-fused diazoles by varying the substituents at the benzene ring, thus leading to the development of tetraarylindazoles as new fluorophores.
authors.affiliation: Department of Chemistry and Chemistry Institute of Functional Materials, Pusan National University , Busan 46241, Republic of Korea.
authors.forename: Og Soon
authors.initials: OS
authors.lastname: Kim
authors.affiliation: Department of Chemistry and Chemistry Institute of Functional Materials, Pusan National University , Busan 46241, Republic of Korea.
authors.forename: Jin Hyeok
authors.initials: JH
authors.lastname: Jang
authors.affiliation: Department of Chemistry and Chemistry Institute of Functional Materials, Pusan National University , Busan 46241, Republic of Korea.
authors.forename: Hyun Tae
authors.initials: HT
authors.lastname: Kim
authors.affiliation: Department of Chemistry and Chemistry Institute of Functional Materials, Pusan National University , Busan 46241, Republic of Korea.
authors.forename: Su Jin
authors.initials: SJ
authors.lastname: Han
authors.affiliation: Department of Chemistry, The Chinese University of Hong Kong , Shatin, New Territories, Hong Kong, China.
authors.forename: Gavin Chit
authors.identifier: 0000-0003-4824-8745
authors.initials: GC
authors.lastname: Tsui
authors.affiliation: Department of Chemistry and Chemistry Institute of Functional Materials, Pusan National University , Busan 46241, Republic of Korea.
authors.forename: Jung Min
authors.identifier: 0000-0003-1645-3322
authors.initials: JM
authors.lastname: Joo