Base-Mediated Stereospecific Synthesis of Aryloxy and Amino Substituted Ethyl Acrylates
作者:M. Shahjahan Kabir、Ojas A. Namjoshi、Ranjit Verma、Michael Lorenz、V. V. N. Phani Babu Tiruveedhula、Aaron Monte、Steven H. Bertz、Alan W. Schwabacher、James M. Cook
DOI:10.1021/jo201948e
日期:2012.1.6
nucleophiles was allowed to react with ethyl (E)- and (Z)-3-iodoacrylates. Screening of different bases indicated that DABCO (1,4-diazabicyclo[2.2.2]octane) afforded successful conversion of ethyl (E)- and (Z)-3-iodoacrylates into aryloxy and amino substituted ethyl acrylates in a stereospecific manner. Herein are the details of this DABCO-mediated stereospecificsynthesis of aryloxy and amino substituted
芳氧基和氨基取代的E-和Z-乙基-3-丙烯酸酯的立体定向合成因其在聚合物工业和药物化学中的潜力而受到关注。在铜催化 ( E )- 和 ( Z )-3-碘代丙烯酸乙酯与苯酚和N-杂环的交叉偶联反应过程中,我们发现了一种非常简单的(非金属)方法用于芳氧基和氨基取代的立体定向合成丙烯酸酯。为了研究芳氧基和氨基取代的丙烯酸酯的立体选择性这个长期存在的问题,一系列O-和N-取代的亲核试剂被允许与( E )-和( Z )-3-碘代丙烯酸乙酯反应。不同碱的筛选表明,DABCO(1,4-二氮杂双环[2.2.2]辛烷)以立体有择方式成功地将( E )-和( Z )-3-碘代丙烯酸乙酯转化为芳氧基和氨基取代的丙烯酸乙酯。本文详细介绍了这种 DABCO 介导的芳氧基和氨基取代的E-或Z-丙烯酸酯的立体定向合成。
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。
10.1093/chemle/upae111
作者:Nishino, Sodai、Kurahashi, Takuya
DOI:10.1093/chemle/upae111
日期:——
Herein, we report a Ni-photoredox-catalyzed stereoconvergent coupling of phenols and alkenyl halides, which affords a Z-coupling product. Moreover, by simply changing the solvent, the reaction also provides access to the E-coupling product with high stereoselectivity. The key factor for changing the stereoisomer of the product was found to be the fluorescence lifetime of photocatalyst.
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