One-Pot Tandem Synthesis of 2-Arylbenzoxazole Derivatives via Copper-Catalyzed CN and CO Bond Formation
作者:Veerababurao Kavala、Donala Janreddy、Mustafa J. Raihan、Chun-Wei Kuo、Chintakunta Ramesh、Ching-Fa Yao
DOI:10.1002/adsc.201200164
日期:2012.8.13
nucleophiles resulted in the formation of benzoxazole derivatives. This procedure involves copper-catalyzedone-pottandem CN/CO coupling reactions. No ligand was used in the reaction, even in the cases of primary or secondary amides, which were used as N-nucleophiles. However, L-proline was used as ligand in the case of N-aromatic heterocycles like indole, imidazole and pyrazole derivatives.
detectable by NMR. For simple tertiary benzanilides carrying an ortho substituent on each ring, conformational control can be high (up to about 10:1) providing the substituents are large, indicating that the two axes are in conformational communication with one another. For more complex diamides, conformational communication breaks down, and mixtures of conformers are evident by NMR.
Regioselective <i>ortho</i> halogenation of <i>N</i>-aryl amides and ureas <i>via</i> oxidative halodeboronation: harnessing boron reactivity for efficient C–halogen bond installation
作者:Ganesh H. Shinde、Ganesh S. Ghotekar、Francoise M. Amombo Noa、Lars Öhrström、Per-Ola Norrby、Henrik Sundén
DOI:10.1039/d3sc04628a
日期:——
ortho position of N-aryl amides and ureas represents a tool to prepare motifs that are ubiquitous in biologically active compounds. To construct such prevalent bonds, most methods require the use of precious metals and a multistep process. Here we report a novel protocol for the long-standing challenge of regioselective ortho halogenation of N-aryl amides and ureas using an oxidative halodeboronation
A Highly Efficient Copper-Catalyzed Method for the Synthesis of 2-Hydroxybenzamides in Water
作者:Sangit Kumar、Shah Balkrishna
DOI:10.1055/s-0031-1289755
日期:2012.5
which may facilitate the hydroxylation in water. Overall, the first report on copper-catalyzed hydroxylation reaction in water and first catalytic route for the synthesis of 2-hydroxybenzamides is presented. Simple purification procedure and convenience of employing low-cost reagents in neat water make this method practical and economical for the synthesis of 2-hydroxybenzamides. An efficient copper-catalyzed