Efficient copper(I)-catalyzed C–S cross-coupling of thiols with aryl halides in an aqueous two-phase system
作者:Xin-Yan Zhang、Xiao-Yan Zhang、Sheng-Rong Guo
DOI:10.1080/17415993.2010.547197
日期:2011.2.1
A mild and convenient C–S bond formation reaction catalyzed by CuI/L-proline in an aqueous two-phase system was achieved, providing a simple method for the synthesis of aryl sulfides in good yields.
2‐Pyridyl Sulfoxide: A Versatile and Removable Directing Group for the Pd
<sup>II</sup>
‐Catalyzed Direct CH Olefination of Arenes
作者:Alfonso García‐Rubia、M. Ángeles Fernández‐Ibáñez、Ramón Gómez Arrayás、Juan Carlos Carretero
DOI:10.1002/chem.201003633
日期:2011.3.21
Removable and versatile: The 2‐pyridylsulfinyl group has proved to be an efficient directinggroup in the PdII‐catalyzed aryl ortho CH olefination. This catalyst system enables the sequential double olefination to give asymmetrically di‐ortho‐functionalized arenes. The sulfinyl directinggroup can be easily cleaved, providing access to 1,3‐disubstituted arenes, or transformed into a thiol group.
Pd(II)-catalyzed C–H olefination of aryl 2-pyridyl sulfoxides with unactivated and activated olefins has been demonstrated. We employed environmentally benign and inexpensive molecular oxygen as the sole oxidant. The versatile nature of the 2-pyridyl sulfoxide directinggroup has been proven by its transformation to the sulfone functionality. Deuterium scrambling experiments and intramolecular kinetic
Palladium-Catalyzed Regioselective Arylation of Arene C-H Bond Assisted by the Removable 2-Pyridylsulfinyl Group
作者:Yuhong Zhang、Xunbin Zhang、Ming Yu、Jinzhong Yao
DOI:10.1055/s-0031-1290320
日期:2012.2
A palladium-catalyzed arylation of arene C-H bond assisted by a removable 2-pyridylsulfinyl group is described. The reaction employs aryltrifluoroborates as the arylation reagent, leading to the corresponding products in moderate to good yield with broad substrate scope. The directinggroup can be removed or converted to other useful functionalities, which showcases the potential synthetic application
provide efficient synthetic access to heteroaryl sulfones in two-steps using a simple palladium–1,1′-bis[(diphenyl)phosphanyl]ferrocene catalyst to form in high yields variously functionalized heteroaromatic thioethers. Pyridinyl-containing substrates can be subsequently selectively oxidized into sulfones and NH-sulfoximines by using very mild oxidation conditions with a high functional group tolerance