2,3-二取代的苯并A高效超声促进的合成[ b ]呋喃通过在离子液体[BMIM] BF分子内的C-C键形成4在室温下†
摘要:
据报道,在室温下,在离子液体[bmim] BF 4中超声有效地促进了2,3-二取代的苯并[ b ]呋喃的合成。在大气条件下,使用无水K 3 PO 4作为温和且廉价的碱,可以介导5 -exo-dig Carbanion-yne分子内环化反应,从而以优异的收率得到标题为benzo [ b ]呋喃的化合物。离子液体[bmim] BF 4既用作反应介质,又用作形成CC键的催化剂。
tert-BuOK-mediated carbanion–yne intramolecular cyclization: synthesis of 2-substituted 3-benzylbenzofurans
摘要:
A mild, efficient, and regioselective carbanion-yne intramolecular cyclization mediated by t-BuOK for the synthesis of 2-substituted 3-benzylbenzofurans is developed. It was started from o-iodophenol (1), based on O-alkylation, and the Sonogashira reaction in sequence to produce 2-(2-phenylethynyl-phenoxy)-1-arylalkanones (5). An intramolecular carbanion-yne 5-exo-dig cyclization reaction of 5, which was mediated by t-BuOK, yielded title benzofurans in good yields. (C) 2011 Elsevier Ltd. All rights reserved.
A Palladium-Catalyzed Domino Approach to 2,3-Disubstituted Benzofurans<i>via</i>an Intermolecular Carbopalladation/C(<i>sp</i><sup>3</sup>)−H Functionalization/Isomerization Sequence
作者:Siva Senthil Kumar Boominathan、Ruei-Jhih Hou、Wan-Ping Hu、Po-Jui Huang、Jeh-Jeng Wang
DOI:10.1002/adsc.201600356
日期:2016.9.15
A palladium‐catalyzed domino strategy has been developed for the synthesis of 2,3‐disubstituted benzofuran derivatives. This cascade reaction sequence involvesintermolecular carbopalladation and C(sp3)−H functionalization followed by isomerization.