1-芳基甲基-4-[(E)-烷-1-烯基] -1 H -1,2,3-三唑是由末端共轭(E)-烯炔通过铜介导的交叉偶联反应制备的。 (E)-烷-1-烯基二甲基丙烯酰胺与(三甲基甲硅烷基)乙炔基溴化物,苄基溴化物和叠氮化钠以一锅法方式存在。在该交叉偶联/点击反应序列中,铜前体Cu(acac)2可以用作串联催化剂。
The palladium-catalyzed cross-coupling reaction of 1-alkenylboranes with allylic or benzylic bromides. Convenient syntheses of 1,4-alkadienes and allybenzenes from alkynes via hydroboration
作者:Norio Miyaura、Takashi Yano、Akira Suzuki
DOI:10.1016/s0040-4039(00)78629-1
日期:1980.1
The reactions of allylic or benzylic bromides with 1-alkenyldisiamylboranes readily available from 1-alkynes in the presence of sodium hydroxide and catalytic amounts of tetrakis-(triphenylphosphine)palladium to give corresponding 1,4-alkadienes or allylbenzenes in good yields.
First synthesis of both 1-aryl-4-[(E)-alk-1-enyl]-1H-1,2,3-triazoles and 1-aryl-4-[(Z)-1-(trimethylsilyl)alk-1-enyl]-1H-1,2,3-triazoles: assembly of π-extended 1,2,3-triazoles using a cross-coupling/click reaction sequence
sequential three-step reaction, which involves copper-mediated cross-coupling reaction of (Z)-1-(trimethylsilyl)alk-1-enyldicyclohexylboranes with (trimethylsilyl)ethynyl bromide to form (Z)-1,3-bis(trimethylsilyl)alk-3-en-1-ynes, deprotection of the trimethylsilyl group on the alkynyl carbon atom to generate (Z)-3-(trimethylsilyl)alk-3-en-1-ynes and click reaction with aryl azides prepared in the same
描述了一种实用且通用的合成方法,用于在三唑环上同时具有芳基和烯基部分的一系列π-延伸的1,2,3-三唑。1-芳基-4-[(E)-烷-1-烯基] -1 H -1,2,3-三唑的合成可以通过末端共轭(E)-烯炔的点击反应完成,该反应由铜-介导的(E)-烷基-1-烯基二甲基丙烯酰胺与(三甲基甲硅烷基)乙炔基溴化物和芳基叠氮化物的交叉偶联反应,该芳基叠氮化物由芳基硼酸和叠氮化钠在另一个烧瓶中制得,用于以下点击反应,无需任何纯化。1-芳基-4-[(Z)-1-(三甲基甲硅烷基)烷-1-基] -1 H-1,2,3-三唑也可以通过顺序三步反应合成,该反应涉及铜介导的(Z)-1-(三甲基甲硅烷基)alk-1-烯基二环己基硼烷与(三甲基甲硅烷基)乙炔基溴的交叉偶联反应形成(Z)-1,3-双(三甲基甲硅烷基)alk-3-en-1-ynes,炔基碳原子上的三甲基甲硅烷基去保护基,生成(Z)-3-(三甲基甲硅烷基)alk-3-en
Nickel Acetylacetonate-Induced 1,4-Additions of 1-Alkenyl(Disiamyl)Boranes to α,β-Unsaturated Ketones, Esters and Nitriles
conjugate addition of 1-alkenyl(disiamyl)boranes to α,β-unsaturated ketones, esters, or nitriles was carried out in the presence of Ni(acac)2 and triethylamine in DMF. The reactions provided γ,δ-unsaturated ketones, esters, and nitriles in high yields while retaining the original configuration of the 1-alkenylboranes. A similar addition reaction of 1-alkenyl(disiamyl)boranes to 1-acetyl-2-vinylcyclopropane
(Trimethylsilyl)ethynyl bromide can be easily transformed into conjugated (E)-enynones, whose skeleton consists of consecutive carbonyl, ethynyl, and (E)-ethenyl units, via a one-pot multicomponent Suzuki-type reaction―Sonogashira reaction sequence. Thus, a three-component coupling of (trimethylsilyl)ethynyl bromide, (E)-alk-1-enyldisiamylborane and acid chloride is achieved in a two-step, one-pot
A CONVENIENT STEREOSPECIFIC SYNTHESIS OF α,β-UNSATURATED CARBOXYLIC ESTERS VIA THE PALLADIUM-CATALYZED CARBONYLATION OF 1-ALKENYLBORANES
作者:Norio Miyaura、Akira Suzuki
DOI:10.1246/cl.1981.879
日期:1981.7.5
1-Alkenyiboranes readily prepared by the hydroboration of alkynes react smoothly with carbon monoxide in the presence of palladium chloride and sodium acetate in methanol to give the corresponding α,β-unsaturated carboxylic esters with retention of configuration with respect to alkenylboranes in good yields.