Mild and Efficient Cobalt-Catalyzed Cross-Coupling of Aliphatic Amides and Aryl Iodides in Water
作者:Yong-Chua Teo、Bryan Tan
DOI:10.1055/s-0034-1380724
日期:——
convenient protocol for the C–N cross-coupling of aliphatic amides and iodobenzene is demonstrated using a simple and inexpensive Co(C2O4)·2H2O/N,N′-dimethylethylenediamine (DMEDA) catalytic system in water. Good yields of N-arylated products were isolated (up to 85%) and the protocol has been successfully applied to the synthesis of the anticancer drug, flutamide.
Regioselectivity in Palladium-Catalyzed C−H Activation/Oxygenation Reactions
作者:Dipannita Kalyani、Melanie S. Sanford
DOI:10.1021/ol051486x
日期:2005.9.1
[reaction: see text] Palladium-catalyzeddirectedC-Hactivation/oxygenation reactions have been explored in a series of meta-substituted aryl pyridine and aryl amide derivatives. These transformations tolerate a diverse array of electron-donating and electron-withdrawing meta-substituents and generally proceed with high levels of regioselectivity for functionalization of the less sterically hindered
Interception of amide ylides with sulfonamides: synthesis of (<i>E</i>)-<i>N</i>-sulfonyl amidines catalyzed by Zn(OTf)<sub>2</sub>
作者:Jijun Chen、Wenhao Long、Shangwen Fang、Yonggang Yang、Xiaobing Wan
DOI:10.1039/c7cc07364j
日期:——
Through the interception of amide ylides with sulfonamides, we herein report the first general example of an intermolecular condensation reaction between sulfonamides and amides. Beyond formamides, this approach was successfully applied to a variety of lactams and linear amides, giving rise to a broad array of (E)-N-sulfonyl amidines.
A process for the preparation of a compound of general formula II: ##STR1## wherein R.sup.1 is hydrogen, or C.sub.1 -C.sub.10 hydrocarbyl or heterocyclyl having 3 to 8 ring atoms, either of which may optionally be substituted; each R.sup.2, R.sup.3, R.sup.4 and R.sup.5 is independently hydrogen or C.sub.1 -C.sub.4 alkyl; A is an optionally substituted aromatic or heteroaromatic ring system; and R.sup.21 is hydrogen, halogen, OH or OCONHR.sup.1, wherein R.sup.1 is as defined above; the process comprising cyclizing a compound of general formula III: ##STR2## wherein A, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.21 are as defined in general formula II and R.sup.25 is a leaving group such as a halogen atom; under basic conditions.
Efficient ligand-free copper-catalyzed N-arylation of amides with aryl halides in water
作者:Fui-Fong Yong、Yong-Chua Teo、Guan-Leong Chua、Gina Shiyun Lim、Yizhen Lin
DOI:10.1016/j.tetlet.2011.01.003
日期:2011.3
A convenient and efficient protocol has been developed for the cross-coupling of amides and aryl iodides using a ligand-freecopper(I) oxide catalyst in water. A variety of amide derivatives afforded the corresponding N-arylated products in moderate to good yields (up to 88%).