One-Pot Synthesis of Benzofurans via Palladium-Catalyzed Enolate Arylation with o-Bromophenols
摘要:
A one-pot synthesis of benzofurans which utilizes a palladium-catalyzed enolate arylation is described. The process demonstrates broad substrate scope and provides differentially substituted benzofurans in moderate to excellent yields. The utility of the method is further demonstrated by the synthesis of the natural product eupomatenoid 6 in three steps.
Di-<i>tert</i>-butylneopentylphosphine (DTBNpP): An Efficient Ligand in the Palladium-Catalyzed α-Arylation of Ketones
作者:Steven M. Raders、Jessica M. Jones、Jeffrey G. Semmes、Steven P. Kelley、Robin D. Rogers、Kevin H. Shaughnessy
DOI:10.1002/ejoc.201402474
日期:2014.11
palladium(II) acetate provide an efficient catalytic system for the α-arylation of ketones. Aryl bromides were coupled with ketones using 0.25–0.5 mol-% Pd(OAc)2/DTBNpP in toluene at 50 °C, whereas aryl chlorides required a higher catalyst loading (0.5–2.0 mol-%) and a higher temperature (80 °C). Coupling of 2-bromophenol with ketones using the Pd/DTBNpP system provides an efficient route for the synthesis
Palladium-catalyzed nucleomethylation of alkynes for synthesis of methylated heteroaromatic compounds
作者:Xi Yang、Gang Wang、Zhi-Shi Ye
DOI:10.1039/d2sc03294e
日期:——
efficient palladium-catalyzed nucleomethylation of alkynes for the simultaneous construction of the heteroaromatic ring and methyl group. The 3-methylindoles, 3-methylbenzofurans and 4-methylisoquinolines were obtained in moderate to excellent yields. Notably, this methodology was employed as a key step for synthesis of a pregnane X receptor antagonist, zindoxifene, bazedoxifene and AFN-1252. The kinetic studies
在此,我们公开了一种新颖且有效的钯催化炔烃核甲基化,用于同时构建杂芳环和甲基。3-甲基吲哚、3-甲基苯并呋喃和4-甲基异喹啉以中等至优异的产率获得。值得注意的是,该方法被用作合成孕烷 X 受体拮抗剂、津多昔芬、巴多昔芬和 AFN-1252 的关键步骤。动力学研究表明,还原消除可能是决定速率的步骤。