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
Ni-catalyzed C–S bond cleavage of aryl 2-pyridyl thioethers coupling with alkyl and aryl thiols
作者:Cheng-Yi Wang、Rui Tian、Yong-Ming Zhu
DOI:10.1016/j.tet.2021.132453
日期:2021.10
A nickel-catalyzed C–SPy bond activation reactions to produce a variety of thioethers has been developed. The reaction is promoted by a user-friendly, inexpensive, air and moisture-stable Ni precatalyst. Various aryl 2-pyridyl thioethers and a wide range of alkyl and aryl thiols substrates were tolerated in this process which afforded products in moderate to excellent yields.
Metal-Free <i>ortho</i>-Selective C–H Borylation of 2-Phenylthiopyridines Using BBr<sub>3</sub>
作者:Gaorong Wu、Binghan Pang、Yangyang Wang、Li Yan、Lu Chen、Tao Ma、Yafei Ji
DOI:10.1021/acs.joc.1c00520
日期:2021.4.16
2-phenylthiopyridines using BBr3 as the boron source under metal-free conditions has been reported. The reaction exhibited site exclusivity, and the synthesized aryl boronates were freely converted to various useful intermediates. Thus, this facile method would be beneficial to synthesize structurally diversified phenylthioethers derivatives and other materials containing boron-nitrogen coordination.
Synthesis of Chiral Sulfoxides via Pd(II)-Catalyzed Enantioselective C–H Alkynylation/Kinetic Resolution of 2-(Arylsulfinyl)pyridines
作者:Tao Zhou、Meng-Xue Jiang、Pu-Fan Qian、Qi-Jun Yao、Xue-Tao Xu、Kun Zhang、Bing-Feng Shi
DOI:10.1021/acs.orglett.1c02918
日期:2021.10.15
A Pd(II)-catalyzed enantioselective C–H alkynylation of 2-(arylsulfinyl)pyridines via kinetic resolution using cheap and commercially available l-pGlu-OH as a chiral ligand is reported. A wide range of 2-(arylsulfinyl)pyridines were compatible with this protocol, giving the alkynylation products and recovered sulfoxides in high yields with high enantioselectivities (up to 99% ee). Furthermore, the
The C–S bond formation from arylhalides and thiols has been well established under various catalytic systems. In this work, user-friendly sulfinates have been exploited as an efficient sulfenylating reagent in the C–Scouplings through visible-light-induced photo/nickel dual catalysis under base- and external reductant-free conditions. A large number of aryl sulfide products were accessed with high