Synthesis of Vinyl-, Allyl-, and 2-Boryl Allylboronates via a Highly Selective Copper-Catalyzed Borylation of Propargylic Alcohols
作者:Lujia Mao、Rüdiger Bertermann、Katharina Emmert、Kálmán J. Szabó、Todd B. Marder
DOI:10.1021/acs.orglett.7b03294
日期:2017.12.15
An efficient methodology for the synthesis of vinyl-, allyl-, and (E)-2-boryl allylboronates from propargylic alcohols via Cu-catalyzed borylation under mild conditions is reported. In the presence of commercially available Cu(OAc)2 or Cu(acac)2 and Xantphos, the reaction affords the desired products in up to 92% yield with a broad substrate scope (43 examples). Isolation of an allenyl boronate as
Stereoselective Nickel-Catalyzed [2+2+2] Cycloaddition of Enynes and Arynes
作者:Mark Lautens、David Candito
DOI:10.1055/s-0030-1261171
日期:2011.9
Examples of stereoselective reactions of aryne intermediates are rare in the literature. A stereoselectivenickel-catalyzed [2+2+2] cycloaddition of 1,6-enynes with aryne intermediates is reported. Excellent stereoselectivities were observed when a substituent is adjacent to the olefin moiety resulting in trans- stereochemistry in the products. This reaction is capable of generating much complexity
C–F Bond Cleavage Enabled Redox-Neutral [4+1] Annulation via C–H Bond Activation
作者:Cheng-Qiang Wang、Lu Ye、Chao Feng、Teck-Peng Loh
DOI:10.1021/jacs.6b12142
日期:2017.2.8
α-difluoromethylene alkyne as a nontraditional one-carbon reaction partner, a synthetically novel method for the construction of isoindolin-1-one derivatives viaRh(III)-catalyzed [4+1] annulation reaction is reported. The 2-fold C-F bondcleavage not only enables the generation of desired product under an overall oxidant-free condition but also results in a net migration of carbon-carbontriplebond. In addition
Gold-Catalyzed Hydrophenoxylation of Propargylic Alcohols and Amines: Synthesis of Phenyl Enol Ethers
作者:Victor Laserna、Catherine Jeapes Rojas、Tom D. Sheppard
DOI:10.1021/acs.orglett.9b01208
日期:2019.6.21
A practical method for the synthesis of phenyl enol ethers is reported. The combination of a gold(I) catalyst and potassium carbonate selectively mediates the addition of phenols to propargylic alcohols/amines in a chemo-, regio-, and stereoselective fashion in high yield. The resulting enol ethers are formed exclusively with a Z-configuration and can be obtained from a wide array of phenols and propargylic
Ligand-Promoted, Copper Nanoparticles Catalyzed Oxidation of Propargylic Alcohols with TBHP or Air as Oxidant
作者:Xiaoquan Yao、Chengyan Han、Min Yu、Weijiang Sun
DOI:10.1055/s-0030-1261227
日期:2011.10
A highly efficient oxidation of propargylicalcohols to ynones was catalyzed by copper nanoparticles (Cu Nps) with TBHP as an oxidant at room temperature. With bipyridine as the ligand, the reaction was accelerated significantly and led in good to excellent yields to a variety of propargylicalcohols. Furthermore, with Cu Nps as the catalyst, molecular oxygen in air could be utilized as oxidant effectively