Ligand-, Copper-, and Amine-Free Sonogashira Reaction of Aryl Iodides and Bromides with Terminal Alkynes
作者:Sameer Urgaonkar、John G. Verkade
DOI:10.1021/jo049325e
日期:2004.8.1
and amine-free palladium-catalyzed Sonogashirareaction of aryl iodides and bromides with terminal alkynes have been developed. Critical to the success of this new protocol is the use of tetrabutylammonium acetate as the base. Noteworthy features of this method are room-temperature conditions and the tolerance of a broad range of functional groups in both reaction partners.
Aqueous Sonogashira coupling of aryl halides with 1-alkynes under mild conditions: use of surfactants in cross-coupling reactions
作者:Gina M. Roberts、Wenya Lu、L. Keith Woo
DOI:10.1039/c5ra00505a
日期:——
Aqueous Sonogashira coupling between lipophilic terminal alkynes and aryl bromides or iodides gave moderate to high yields at 40 °C using readily available and inexpensive surfactants (2.0 w/v% in water) such as SDS and CTAB. The catalyst precursor was 2 mol% Pd(PPh3)2Cl2, and included a 5 mol% Cu(I) co-catalyst for aryl iodide substrates. Aryl-bromide reagents were found to be inhibited by iodide
亲脂性末端炔烃与芳基溴化物或碘化物之间的Sonogashira水溶液偶联在40°C下使用容易获得且便宜的表面活性剂(在水中为2.0 w / v%),例如SDS和CTAB,可得到中等至高收率。催化剂前体是2mol%的Pd(PPh 3)2 Cl 2,并且包括用于芳基碘化物底物的5mol%的Cu(I)助催化剂。发现芳基溴化物试剂被碘化物和Cu(I)抑制。在无Cu(I)条件下的研究揭示了两种竞争途径。去质子化途径产生了传统的Sonogashira产物(3),而碳pal化途径产生了烯炔[ 5]。。表面活性剂溶液(SDS或CTAB)最多可循环使用三次,以在CuI存在下在1-辛炔和1-碘庚烷之间偶联,然后降低产率。
Copper-Free Oxime-Palladacycle-Catalyzed Sonogashira Alkynylation of Deactivated Aryl Bromides and Chlorides in Water under Microwave Irradiation
作者:Eduardo Buxaderas、Diego A. Alonso、Carmen Nájera
DOI:10.1002/ejoc.201300785
日期:2013.9
Financial support from the Ministerio de Economia y Competitividad (MINECO) (project CTQ2010-20387), Consolider INGENIO (project 2010 CSD2007-00006), Fondos Europeos para el Desarrollo Regional (FEDER), the Generalitat Valenciana (project PROMETEO/2009/038), and the University of Alicante is acknowledged.
经济与竞争部(MINECO)(CTQ2010-20387 项目)、INGENIO 联合公司(项目 2010 CSD2007-00006)、Fondos Europeos para el Desarrollo 地区(FEDER)、瓦伦西亚省政府(PROMETEO/208 项目)的财政支持,和阿利坎特大学是公认的。
Efficient and General Protocol for the Copper-Free Sonogashira Coupling of Aryl Bromides at Room Temperature
作者:Arash Soheili、Jennifer Albaneze-Walker、Jerry A. Murry、Peter G. Dormer、David L. Hughes
DOI:10.1021/ol035632f
日期:2003.10.1
[reaction: see text]. A mild and general protocol for the copper-free Sonogashiracoupling of aryl bromides with acetylenes has been developed. The use of (AllylPdCl)2 and P(t-Bu)3 provides the active Pd(0) catalyst that allows subsequent coupling of various alkynes at room temperature with good to excellent yields.
most appropriate catalyst for Pd-catalyzed Sonogashiracoupling often requires time and resources. We applied a continuousflow device for rapidcatalyst screening of 4 heterogeneous catalysts over 6 Sonogashiracoupling reactions together with longevity estimation. The screening procedure requires only 8 hours. For coupling the alkynes with 4- iodo-anisole Fibrecat types of catalysts showed the highest