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
One-Pot Synthesis of Conjugated (E)-Enynones via Two Types of Cross-Coupling Reaction
(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
Construction of Terminal Conjugated Enynes: Regio- and Stereoselective Syntheses of 3-Alken-1-ynes and 1-Trimethylsilyl-3-alken-1-ynes from Alkenyldialkylboranes and (Trimethylsilyl)ethynyl Bromide
作者:Masayuki Hoshi、Kazuya Shirakawa
DOI:10.1055/s-2002-32604
日期:——
The cross-coupling reaction of (E)- and (Z)-1-alkenyl-dialkylboranes with (trimethylsilyl)ethynyl bromide proceeds in the presence of a base and a catalytic amount of Cu(acac) 2 under very mild conditions to provide conjugated enynes whose carbon-carbon triple bond is in distal position. The use of 1 M NaOMe as a base exclusively affords both (E)- and (Z)-3-alken-1-ynes with high regio- and stereoselectivity
(E)- 和 (Z)-1- 烯基-二烷基硼烷与(三甲基甲硅烷基)乙炔基溴的交叉偶联反应在碱和催化量的 Cu(acac) 2 存在下在非常温和的条件下进行,以提供共轭碳碳三键位于远端的烯炔。使用 1 M NaOMe 作为碱专门提供 (E)- 和 (Z)-3-alken-1-ynes 具有高区域和立体选择性,而使用 LiOHH 2 O 代替 1 M NaOMe 优先提供两者(E)- 和 (Z)-1-trimethylsilyl-3-alken-1-ynes 区域和立体选择性。
One-pot synthesis of 1-arylmethyl-4-[(<i>E</i>)-alk-1-enyl]-1<i>H</i>-1,2,3-triazoles <i>via</i> a cross-coupling/click reaction sequence
,2,3-triazoles have been synthesized from terminal conjugated (E)-enynes, prepared by copper-mediated cross-coupling reaction of (E)-alk-1-enyldisiamylboranes with (trimethylsilyl)ethynyl bromide, benzyl bromides and sodium azide in a one-pot fashion. In this cross-coupling/click reaction sequence, the copper precursor Cu(acac)2 can serve as a tandem catalyst.
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。