Palladium-Catalyzed Oxidative Cyclization of 3-Phenoxyacrylates: An Approach To Construct Substituted Benzofurans from Phenols
作者:Chengliang Li、Yicheng Zhang、Pinhua Li、Lei Wang
DOI:10.1021/jo200317f
日期:2011.6.3
applicable synthesis of benzofuransfrom commercially available phenols and propiolate through the direct oxidative cyclization has been developed. In the presence of Pd(OAc)2/PPh3 and CF3CO2Ag, (E)-type 3-phenoxyacrylates underwent reaction smoothly to generate the corresponding benzofurans in good yields in benzene at 110 °C under the air pressure. In addition, this transformation of phenols into benzofurans
在本文中,已经开发了一种新颖且适用的由市售苯酚和丙酸酯通过直接氧化环化反应合成苯并呋喃的方法。在Pd(OAc)2 / PPh 3和CF 3 CO 2 Ag的存在下,(E)型3-苯氧基丙烯酸酯在空气中于110°C的条件下顺利进行反应,以高收率在苯中生成相应的苯并呋喃。此外,苯酚向苯并呋喃的这种转化也可以在一锅中进行。该过程既简单又高效。提出了3-苯氧基丙烯酸酯钯催化氧化环化的初步机理。
Lewis acid-catalyzed annulative partial dimerization of 3-aryloxyacrylates to 4-arylchroman-2-ones: synthesis of analogues of tolterodine, RORγ inhibitors and a GPR40 agonist
作者:Rupesh A. Kunkalkar、Rodney A. Fernandes
DOI:10.1039/c8cc09785b
日期:——
annulative partial dimerization of 3-aryloxyacrylates to 4-arylchroman-2-ones catalyzed by Lewis acid (BF3·OEt2) has been developed. The reaction involves two molecules of 3-aryloxyacrylate, resulting in the loss of one propiolate molecule to furnish 4-arylchroman-2-one, an important structural motif found in many natural products. This methodology has been elaborated to synthesize analogues of tolterodine