182949-90-2Relevant articles and documents
Merging Photoredox with Br?nsted Acid Catalysis: The Cross-Dehydrogenative C?O Coupling for sp3 C?H Bond Peroxidation
Xia, Qing,Wang, Qiang,Yan, Changcun,Dong, Jianyang,Song, Hongjian,Li, Ling,Liu, Yuxiu,Wang, Qingmin,Liu, Xiangming,Song, Haibin
supporting information, p. 10871 - 10877 (2017/08/18)
A photoredox and Br?nsted acid synergistically catalyzed cross-dehydrogenative C?O coupling reaction is developed in which isochroman peroxyacetals are formed through sp3 C?H bond peroxidation. The reported method is characterized by its extremely mild reaction conditions, excellent yields, and broad substrate scope. An oxocarbenium ion p-chlorobenzenesulfonate was speculated to be the reactive intermediate. The role of hemiacetals and oxygenated dimers on the effective stabilization of the oxocarbenium ion was investigated; the presence of acid appeared to establish equilibrium between hemiacetals and oxygenated dimers with the oxocarbenium ion pairs. The broad applicability of the method highlights the potential of the protocol for molecule synthesis.
Manganese dioxide-methanesulfonic acid promoted direct dehydrogenative alkylation of sp3 C-H bonds adjacent to a heteroatom
Liu, Xigong,Sun, Bin,Xie, Zhiyu,Qin, Xiaojun,Liu, Lei,Lou, Hongxiang
, p. 3104 - 3112 (2013/06/05)
A manganese dioxide (MnO2)-methanesulfonic acid (CH 3SO3H) oxidation system has been developed to efficiently promote direct coupling of benzylic ethers and carbamates with simple ketones via oxidative C-H bond activation.
Copper-catalyzed enantioselective additions to oxocarbenium ions: Alkynylation of isochroman acetals
Maity, Prantik,Srinivas, Harathi D.,Watson, Mary P.
, p. 17142 - 17145 (2011/12/13)
We have developed an enantioselective, copper(I)-catalyzed addition of terminal alkynes to racemic isochroman acetals. This method is one of the first transition-metal-catalyzed approaches to enantioselective additions to prochiral oxocarbenium ions. In this reaction, TMSOTf is used to form the oxocarbenium ion in situ under conditions compatible with simultaneous formation of the chiral copper acetylide. By using a bis(oxazoline) ligand, good yields and enantioselectivities are observed for a variety of enantioenriched 1-alkynyl isochromans.