In the presence of catalytic amounts of RhH(PPh3)4 and 1,2-bis(diphenylphosphino)ethane (dppe), 1,3-benzothiazoles, 1,3-benzoxazoles, and benzothiophene reacted with α-(phenylthio)isobutyrophenone giving 2-phenylthio derivatives. Reactive monocyclic heteroaromatics, 1-methyl-1,2,3,4-tetrazole and 2-cyanothiophene were also converted into the 5-phenylthio derivatives. The use of an appropriate phenylthio
Coupling of Heteroarene and Arenol via Nickel‐Catalyzed C−H/C−OH Activation
作者:Chen‐Hsun Hung、Ting‐Hsuan Wang、Glenn P. A. Yap、Joon Ching Juan、Tiow‐Gan Ong
DOI:10.1002/cctc.202300249
日期:2023.6.9
A nickel-catalyzedheteroareneC−H/arenol C−OH coupling reaction is reported, which omits the use of strong Lewis-acid additive and low atom-economy protecting reagent. Arrays of arenols and heteroarenes are effective in this protocol using the in-situ activating reagent pivalic anhydride.
Cobalt-Catalyzed Cross-Dehydrogenative Coupling Reactions of (Benz)oxazoles with Ethers
作者:Yanrong Li、Mengshi Wang、Wei Fan、Fen Qian、Guigen Li、Hongjian Lu
DOI:10.1021/acs.joc.6b02211
日期:2016.12.2
The cobalt-catalyzed cross-dehydrogenative coupling of (benz)oxazoles and ethers is described. Access to some important bioactive heteroaryl ether derivatives was achieved using CoCO3 as an inexpensive catalyst at levels as low as 1.0 mol %. Investigation of the mechanism indicates a catalytic cycle involving a radical process.