Nickel Catalysis Enables Hetero [2+2+1] Cycloaddition between Yne-Isothiocyanates and Isonitriles with Low Catalyst Loading
作者:Rui-Juan Liu、Peng-Fei Wang、Wen-Kui Yuan、Li-Rong Wen、Ming Li
DOI:10.1002/adsc.201601271
日期:2017.4.17
Nickel(II) can be used to catalyze the hetero [2+2+1] cycloaddition of 2‐alkynylaryl isothiocyanates and isonitriles in 2‐methyltetrahydrofuran (2‐MeTHF) to give a wide array of thieno[2,3‐b]indoles in excellent yields. The reaction is featured by employing as little as 0.3 mol% nickel(II) acetylacetonate [Ni(acac)2] under air conditions in the absence of any additives (additional reducing agents and
Palladium-Catalyzed Oxidative [2 + 2 + 1] Annulation of 1,7-Diynes with H<sub>2</sub>O: Entry to Furo[3,4-<i>c</i>]quinolin-4(5<i>H</i>)-ones
作者:Xuan-Hui Ouyang、Fang-Lin Tan、Ren-Jie Song、Wei Deng、Jin-Heng Li
DOI:10.1021/acs.orglett.8b02883
日期:2018.11.2
A novel cascade annulation of 1,7-diynes with water has been developed for the synthesis of furo[3,4-c]quinolin-4(5H)-one skeletons with high atom- and step-economy. The transformation was enabled by a palladium catalyst in the presence of copper salt as the promoter, involving the formation of one C–C bond and two C–O bonds. Moreover, the reaction exhibits good tolerance of functional groups and broad
已经开发了一种新型的1,7-二炔用水级联反应,用于合成呋喃[3,4- c ]喹啉-4(5 H)-具有高原子经济性和阶梯经济性的骨架。在铜盐作为促进剂的情况下,钯催化剂可实现转化,包括一个C–C键和两个C–O键的形成。此外,该反应显示出对官能团的良好耐受性和广泛的底物范围。值得注意的是,对照实验支持从水中引入新的氧原子。
Cu(<scp>i</scp>) catalysis for selective condensation/bicycloaromatization of two different arylalkynes: direct and general construction of functionalized C–N axial biaryl compounds
enantioselectivity verifies its potential for the simplest asymmetric synthesis of atropoisomeric biaryls. Western blotting demonstrated that the newly developed compounds are promising targets in biology and pharmaceuticals. This unique reaction can construct structurally diverse C–N axial biarylcompounds that have never been reported by other methods, and might be extended to various applications in materials
Synthesis of binuclear iridium(III) and rhodium(III) complexes bearing methylnaphthalene-linked N-heterocyclic carbenes, and application to intramolecular hydroamination
with silver oxide followed by [Cp∗MCl2]2 (M = Ir, Rh), binuclear iridium and rhodiumcomplexes 2 were formed. Reaction of these complexes 2 with AgPF6 afforded Cl-bridged cationic binuclear iridium and rhodiumcomplexes 3. X-ray crystallographic analysis of 3 revealed that the two imidazole rings of the carbene ligand are in a parallel geometry. The cationic binuclear iridiumcomplexes 3-Ir could be