Synthesis of Isoquinoline Derivatives via Palladium‐Catalyzed C−H/C−N Bond Activation of
<i>N</i>
‐Acyl Hydrazones with
<i>α</i>
‐Substituted Vinyl Azides
A palladium‐catalyzed cyclization of N‐acetyl hydrazones with vinyl azides has been developed. Various substituted isoquinolines, including diverse fused isoquinolines can be prepared via this protocol in moderate to good yields. Mechanistic studies suggest that α‐substituted vinyl azide serves as an internal nitrogen source. Also, C−H bond activation and C−N bond cleavage have been realized using
作者:Ashley M. Berman、Robert G. Bergman、Jonathan A. Ellman
DOI:10.1021/jo101793r
日期:2010.11.19
products using the commercially available and air-stable catalyst [RhCl(CO)2]2. Electron-deficient and electron-rich aromatic bromides couple in good yields, and hydroxyl, chloro, fluoro, trifluoromethyl, ether, and ketone functionalities are compatible with the reaction conditions. Aroyl chlorides also serve as effective azine coupling partners to give ortho-arylation products via a decarbonylation pathway
A water-mediated C–H activation using sulfoxonium ylides is reported, providing a general, green and step-economic approach to construct a C–C bond and varieties of useful N-heterocycle scaffolds. Notably, the “water-mediated” activation, in contrast to that in organic solvents, shows great potential in pharmaceutical, biochemistry and chemical industries.
Free Amine-Directed Ru(II)-Catalyzed Redox-Neutral [4 + 2] C–H Activation/Annulation of Benzylamines with Sulfoxonium Ylides
作者:Yogesh N. Aher、Amit B. Pawar
DOI:10.1021/acs.joc.2c00931
日期:2022.10.7
An externaloxidantfree Ru(II)-catalyzed C–Hfunctionalization/annulation of primary benzylamines with sulfoxonium ylides has been developed for the synthesis of isoquinolines. The reaction utilizes free amine as a directing group, which is generally considered to be a poor directing group. This work presents the first example of Ru-catalyzed C–Hfunctionalization of benzylamines under redox-neutral
A highly efficient method for the facile access of isoquinolines and isoquinoline N-oxides via a Cu(i)-catalyzed intramolecular cyclization of (E)-2-alkynylaryl oxime derivatives in water has been developed. This protocol was performed under simple and mild conditions without organic solvent, additives or ligands. By switching on/off a hydroxyl protecting group of oximes, the selective N-O/O-H cleavage