Photocatalytic anion oxidation achieves direct aerobic difunctionalization of alkenes leading to β -thiocyanato alcohols
作者:Wei Zhang、Jun-Tao Guo、Yue Yu、Zhi Guan、Yan-Hong He
DOI:10.1016/j.tet.2018.05.007
日期:2018.6
extra reducing agent and the new CS and CO bonds could be constructed in one pot. Molecularoxygen not only was used as an excellent terminal oxidant, but also served as a green oxygen source, which is one of the most ideal processes to realize CH bond oxidation functionalization. Moreover, the reaction also proceeded very well under irradiation of sunlight.
Photoinduced cascade cyclization of alkynes with NH<sub>4</sub>SCN: access to SCN-containing dibenzazepines or dioxodibenzothiazepines
作者:Shiliu Chen、Qinqin Yan、Jie Fan、Yongjun Gao、Xiulong Yang、Lijun Li、Zhongquan Liu、Zejiang Li
DOI:10.1039/d2gc01276f
日期:——
Photoinduced radical cascade cyclization of aryl acetylenes with NH4SCN was achieved, which provides a simple and mild protocol for the synthesis of SCN-containing dibenzazepines or dioxodibenzothiazepines. A variety of scaled-up operations, functional group transformations, radical capture studies and on/off light experiments were performed to test the merits of the desired products and the reaction
Diquat Based Dyes: A New Class of Photoredox Catalysts and Their Use in Aerobic Thiocyanation
作者:Armin Meier、Sabuhi V. Badalov、Timur Biktagirov、Wolf Gero Schmidt、René Wilhelm
DOI:10.1002/chem.202203541
日期:——
From diquat to dye-cat. A series of push–pull dyes using diquat as the electron-acceptor moiety have been synthesized. Their photocatalytic abilities were tested in the aerobic thiocyanation of indoles and pyrroles, giving yields of up to 97 %.
The photoadduct formed by photolysis of the [Bapa(0), (pBzl)Phe(5), Met(O-2)(11)]SP/NK-1 complex localised within the (TMP175)-M-173 domain of the NK-1 receptor cannot be cleaved by CNBr on the C-side of methionine; an unusual rearrangement of the intermediate sulfonium instead Occurred. The reactivity of 1,1-diphenyl-2-methylsulfinyl ethanol 10 towards CNBr treatment and the stability of the 1,1-diphenyl oxirane 14 were analysed by NMR and mass spectrometry. 1,1-Diphenyl ethylene 13 can be formed from epoxide 14 even in slightly acidic conditions and during positive DCI/NH3 mass spectrometry analysis. Altogether, these results suggest that if a covalent linkage between the [Bapa(0), (pBzl)Phe(5), Met(O-2)(11)] and the NK-1 receptor occurred on the CyH2 of methionine-174, CNBr treatment will lead to an epoxide/ketone and an ethylenic compound. (C) 2002 Published by Elsevier Science Ltd.