Transition-Metal-Free Synthesis of <i>N</i>-Aryl Hydroxamic Acids via Insertion of Arynes
作者:Lanlan Zhang、Yu Geng、Zhong Jin
DOI:10.1021/acs.joc.6b00111
日期:2016.5.6
carbon–carbon double bonds, and free N–H bond of indole are found to be compatible with this process. In particular, the protocol is applicable in the synthesis of structurally diverse N-aryl hydroxamates and hydroxamicacids derived from N-protecting amino acids and peptides. In the presence of multiple amide N–H bonds, the N-arylation reaction can proceed selectively in the N–H bonds of terminal N-OBn amides
derivatives were prepared by copper-catalyzedcross-coupling of hydroxamates with aryliodides. The reaction conditions are compatible with standard hydroxy-protecting groups on the hydroxylamine moiety and are applicable to a broad range of coupling partners. N-Aryl-O-alkylhydroxamic acid derivatives were prepared by copper-catalyzedcross-coupling of hydroxamates with aryliodides. The reaction conditions
Cesium Carbonate Promoted Direct Arylation of Hydroxylamines and Oximes with Diaryliodonium Salts
作者:Yang Yang、Xunshen Wu、Jianwei Han、Song Mao、Xiaofei Qian、Limin Wang
DOI:10.1002/ejoc.201402920
日期:2014.11
A transition-metal-free approach for the arylation of hydroxylamines and oximes with diaryliodonium salts was developed. The reaction proceeded smoothly at room temperature in the presence of cesium carbonate. As a result, a wide range of N- and O-arylated hydroxylamines were synthesized in good to excellent yields (45-98%).
One-Pot Formation of CC and CN Bonds through Palladium-Catalyzed Dual CH Activation: Synthesis of Phenanthridinones
作者:Guan-Wu Wang、Ting-Ting Yuan、Dan-Dan Li
DOI:10.1002/anie.201005874
日期:2011.2.7
Two cycles in one pot! The synthesis of biologically important phenanthridinones has been achieved by the one‐pot formation of CC and CN bonds through a palladium‐catalyzed dual CHactivation, which involves four bond ruptures and two bond formations (see scheme). The conversion of phenanthridinones into natural product like derivatives further demonstrates the utility of this synthetic achievement
1,2‐Diiodobenzene is presented as an efficient catalyst precursor for the intermolecular amination of arenes under homogeneous conditions. N‐Troc‐ and N‐phthalimido‐substituted methoxyamines serve as suitable nitrogen sources providing the corresponding aniline derivatives in up to 99% yield and with up to 66:1 regioselectivity. Key for this successful CN coupling protocol is the strained μ‐oxo‐bridged