Highly enantioselective pyridine-directed rhodium-catalyzed asymmetric hydrogenation of challenging 1,1-diarylalkenes is achieved by using [Rh(NBD)DuanPhos]BF4 as a precatalyst. Various types of 2-pyridine substituted 1,1-diarylalkenes could be hydrogenated with good to excellent enantioselectivities, which provide an efficient route to the synthesis of pharmaceutically and biologically active compounds
Conjugate Addition–Enantioselective Protonation of <i>N</i>-Aryl Glycines to α-Branched 2-Vinylazaarenes via Cooperative Photoredox and Asymmetric Catalysis
and a dicyanopyrazine-derived chromophore (DPZ) photosensitizer that is mediated by visible light, a variety of α-branched 2-vinylpyridines and 2-vinylquinolines with N-aryl glycines underwent a redox-neutral, radical conjugate addition-protonation process and provided valuable chiral 3-(2-pyridine/quinoline)-3-substituted amines in high yields with good to excellent enantioselectivities (up to >99%
Palladium-Catalyzed Divergent Arylation with Triazolopyridines: One-Pot Synthesis of 6-Aryl-2-α-styrylpyridines
作者:Youngtaek Moon、Soonhyung Kwon、Dahye Kang、Honggu Im、Sungwoo Hong
DOI:10.1002/adsc.201500967
日期:2016.3.17
We have developed a new strategy for palladium‐catalyzed arylation reactions with triazolopyridines, wherein two different chemical transformations (C‐3 vs. C‐7) are observed by differentiating the substrates using different bases. The reactive palladium carbenoids were directly generated from triazolopyridines and underwent denitrogenative arylations with aryl bromides. Intriguingly, when potassium
Conjugate addition-enantioselective protonation to forge tertiary stereocentres α to azaarenes via cooperative hydrogen atom transfer and chiral hydrogen-bonding catalysis
Cooperative hydrogen atom transfer and chiral hydrogen-bonding catalysis as a new platform for the asymmetric synthesis of azaarene derivatives is reported. By using a tetrabutylammonium decatungstate as the photocatalyst and a chiral phosphoric acid as the hydrogen-bonding catalyst, transformations of a variety of commercially available hydrocarbons and silanes with diverse α-branched 2-vinylazaarenes
Copper-Catalyzed C–H Stereoselective Cyanation of Alkenes by Using an α-Iminonitrile as a Cyanating Reagent
作者:Yong-Ming Zhu、Zhen-Bang Chen、Qing-Qing Gao、Kui Liu
DOI:10.1055/s-0037-1610680
日期:2019.1
Abstract The first copper-catalyzed cyanation through alkene C–H bond activation by using an α-iminonitrile as a cyanating agent has been realized. The approach efficiently constructs acrylonitriles in good yields with the advantages of high regioselectivity, cost-benefit, and operational simplicity. The first copper-catalyzed cyanation through alkene C–H bond activation by using an α-iminonitrile