PPh<sub>3</sub>/NaI driven photocatalytic decarboxylative radical cascade alkylarylation reaction of 2-isocyanobiaryls
作者:Ketan Wadekar、Suraj Aswale、Veera Reddy Yatham
DOI:10.1039/d0ra03211e
日期:——
PPh3/NaI driven photocatalytic decarboxylative cyclization of 2-isocyanobiaryls with alkyl NHP esters was developed. This simple protocol afforded a novel and environmentally friendly approach to furnish 6-alkyl phenanthridines in good yields.
Visible-light-induced tandem radical addition–cyclization of 2-aryl phenyl isocyanides catalysed by recyclable covalent organic frameworks
作者:Shuyang Liu、Wenna Pan、Songxiao Wu、Xiubin Bu、Shigang Xin、Jipan Yu、Hao Xu、Xiaobo Yang
DOI:10.1039/c9gc00022d
日期:——
A visible-light-induced tandemradicaladdition–cyclization sequence via 2-aryl phenyl isocyanides as the starting material and two-dimensional covalent organic frameworks (2D-COFs) as the photocatalyst was developed, delivering multifarious 6-substituted phenanthridines in high yields. Benefitting from the utilization of a heterogeneous photocatalyst, this protocol features easy catalyst separation
Efficient Synthesis of Phenanthridines Using Hendrickson Reagent Initiated Cascade Reaction under Mild Conditions
作者:Lin Chen、Zhu-Jun Yao、Jie Xi、Qing-Li Dong、Guan-Sai Liu、Shaozhong Wang
DOI:10.1055/s-0030-1258081
日期:2010.7
A number of variously substituted phenanthridines have been synthesized using the newly developed methodology under mild conditions. The Hendrickson reagent initiated cascade annulation, which is composed of a mild conversion of stable amide precursor to highly reactive imido-carbonium intermediate and a subsequent intramolecular Friedel-Crafts reaction, successfully served as the key method.
A unified strategy for silver-, base-, and oxidant-free direct arylation of C–H bonds
作者:Manoj K. Sahoo、Siba P. Midya、Vinod G. Landge、Ekambaram Balaraman
DOI:10.1039/c6gc03438a
日期:——
C–N2 bond cleavage. This unified strategy has been achieved by the synergistic combination of visible-light metal-free photoredox and palladiumcatalysis under silver-, base- and/or additive-free conditions. The broad substrate scope, functional group tolerance, excellent regioselectivity and redox-neutral conditions of this process make it attractive for the effective synthesis of a wide range of important
We reported the first example of the construction of C–C bonds using unprotected amino acids as stable alkyl/acyl radical precursors under metal-free conditions. This novel, environmentally friendly, and one-pot procedure was successfully applied to the radical alkylation or acylation/cyclization of isocyanides, which selectively affords 6-alkyl or acyl phenanthridines, depending on the substituent