2026-04-29T13:47:27Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/113342026-02-07T01:05:23Zcom_10259_4363com_10259_5086com_10259_2604col_10259_4364

00925njm 22002777a 4500 dc Sanz Villafruela, Juan author Martínez Alonso, Carmen author Echevarría Poza, Igor author Vaquero Gutiérrez, Mónica author Carbayo Martín, Mª Aránzazu author Fidalgo Zorrilla, Jairo author Rodríguez, Ana M. author Cuevas Vicario, José Vicente author Lima, João C. author Moro, Artur J. author Manzano Manrique, Blanca Rosa author Jalón Sotés, Félix Ángel author Espino Ordóñez, Gustavo author 2021 Current societies demand sustainable synthetic procedures and accordingly the combination of two photocatalytic reactions in a one-pot process is a very appealing chemical tool. In the present work, we report on the development of new Ir(III) bis-cyclometallated photosensitizers with β-carboline ligands and disclose a simple and unprecedented photocatalytic one-pot two-step protocol for the chemoselective and C-3 regioselective oxidative thiocyanation of indolines to produce the corresponding 3-thiocyanato-indoles. The procedure is performed in THF at room temperature, in the presence of NH4SCN, O2 and the Ir(III) photocatalysts under blue light exposure. Moreover, this methodology combines important advantages such as an outstanding efficiency, based on good yields for low catalyst loadings, along with an excellent sustainability founded on the use of O2 as a green oxidant and light as the energy source. In addition, DFT studies have allowed a clear interpretation of the photophysical and electrochemical properties of the Ir(III) complexes and transient absorption experiments, along with other experimental proof, have demonstrated that the two photocatalytic processes are mediated by 1O2. Our results pave the way for future developments in the field of photocatalysis using Ir(III) biscyclometallated complexes as photosensitizers. 2052-1553 https://hdl.handle.net/10259/11334 10.1039/d0qi01307b 2052-1553 Photocatalysis Singlet oxygen Iridium(III) photocatalysts Thiocyanation of indoles Photooxidative dehydrogenation of indolines β-carbolines One-pot photocatalytic transformation of indolines into 3-thiocyanate indoles with new Ir(iii) photosensitizers bearing β-carbolines