1,8-dichloro-4-octyne | 53783-67-8

• 分子结构分类: 有机化合物 - 有机卤素化合物 - 有机氯化物
• 英文名称: 1,8-dichloro-4-octyne
• 英文别名: 1,8-dichloro-oct-4-yne；1.8-Dichlor-octin-(4)；1,8-dichlorooct-4-yne
• CAS: 53783-67-8
• 化学式: C₈H₁₂Cl₂
• 分子量: 179.089
• InChiKey: QPOOODGBGGWEAF-UHFFFAOYSA-N

物化性质

• 沸点：
  111-114 °C(Press: 10 Torr)
• 密度：
  1.074±0.06 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  3.1
• 重原子数：
  10
• 可旋转键数：
  4
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.75
• 拓扑面积：
  0
• 氢给体数：
  0
• 氢受体数：
  0

反应信息

• 作为反应物：
  描述：

  1,8-dichloro-4-octyne 在 lithium diisopropyl amide 作用下， 以 四氢呋喃 、 正己烷 为溶剂， 以74%的产率得到1,2-bicyclopropylacetylene
  参考文献：
  名称：

  Versatile Syntheses of Alkynyl- and Substituted Alkynylcyclopropanes: 2-Alkoxyethynylcyclopropanes for the Anellation of Bicyclo[3.3.0]octane Fragments

  摘要：

  Enol醚1a-f在-78°C下进行溴化，生成的烷基1,2-二溴乙基醚经区域选择性偶联反应与炔丙基-镁溴反应，得到4-烷氧基-5-溴-1-戊炔2a-f，其在炔端用三甲基硅基保护。这些4-烷氧基-5-溴-1-三甲基硅基-1-戊炔3a-f通过γ-消除易于环化，以优异的总收率得到三甲基硅基保护的2-烷氧基乙炔基环丙烷4a-f。在适当条件下，可以选择性地制备(E)-4a-f。然而，溴对纯手性enol醚1e和1f的加成反应的立体选择性最多为64%（对于2f）。2-烷氧基-1-三甲基硅基乙炔基环丙烷(E/Z)-4可通过LDA或丁基锂去质子化，得到构型稳定的1-锂衍生物(E)-6，这些衍生物通过保留三元环的构型被活性亲电试剂（质子、羰基化合物、甲苯磺酰卤化物）捕获。2-烷氧基-1-乙炔基环丙烷5可用于将双环[3.3.0]辛烷片段通过多米诺式反应序列结合到环烯上，如通过(E)-5c与降冰片烯（14）以及δ环烯（20）的Pauson-Khand环加成反应，随后通过合理的立体选择性相互转化为四环和六环化合物anti/syn-19以及anti/syn-25/27所证明。

  DOI：

  10.1055/s-1993-25988
• 作为产物：
  描述：

  oct-4-yne-1,8-diol 在 吡啶 、 甲基磺酰氯 、 lithium chloride 作用下， 以 四氢呋喃 、 N,N-二甲基甲酰胺 为溶剂， 反应 12.0h， 以56%的产率得到1,8-dichloro-4-octyne
  参考文献：
  名称：

  Cobalt-Catalyzed Addition of Azoles to Alkynes

  摘要：

  A ternary catalytic system consisting of a cobalt salt, a diphosphine ligand, and a Grignard reagent promotes syn-addition of an azole C(2)-H bond across an unactivated internal alkyne with high chemo-, regio-, and stereoselectivities under mild conditions. Mechanistic experiments suggest that the reaction involves oxidative addition of the oxazolyl C-H bond to the cobalt center, alkyne insertion into the Co-H bond, and reductive elimination of the resulting diorganocobalt species.

  DOI：

  10.1021/ol101777x

文献信息

• Versatile Syntheses of Alkynyl- and Substituted Alkynylcyclopropanes: 2-Alkoxyethynylcyclopropanes for the Anellation of Bicyclo[3.3.0]octane Fragments
  作者：Hans-Christian Militzer、Sten Schömenauer、Carola Otte、Carsten Puls、Jürgen Hain、Stefan Bräse、Armin de Meijere

  DOI：10.1055/s-1993-25988

  日期：——

  Enol ethers 1a-f are brominated at - 78° C and the resulting alkyl 1,2-dibromoethyl ethers are regioselectively coupled with propargyl-magnesium bromide to give 4-alkoxy-5-bromo-1-pentynes 2a-f, which are protected at the acetylenic terminus with a trimethylsilyl group. These 4-alkoxy-5-bromo-1-trimethylsilyl-1-pentynes 3a-f readily cyclize by γ-elimination to give trimethylsilyl protected 2-alkoxyethynylcyclopropanes 4a-f in excellent overall yields. Under appropriate conditions (E)-diastereomers (E)-4a-f can be prepared selectively. The diastereoselectivity of the bromine addition onto enantiomerically pure chiral enol ethers 1e and 1f, however, is 64% (for 2f) at best. 2-Alkoxy-1-trimethylsilylethynyl-cyclopropanes (E/Z)-4 can be deprotonated with LDA or butyllithium to give configurationally stable 1-lithio derivatives (E)-6, which are trapped by reactive electrophiles (protons, carbonyl compounds, tosyl halides) with retention of configuration on the three-membered ring. 2-Alkoxy-1-ethynylcyclopropanes 5 can be used to anellate a bicyclo[3.3.0]octane fragment onto a cycloalkene in a domino-type reaction sequence, as demonstrated by the Pauson-Khand cycloaddition of (E)-5c to norbornene (14) as well as deltacyclene (20), and subsequent interconversion to the tetracyclic and hexacyclic compounds anti/syn-19 and anti/syn-25/27 with a reasonable degree of diastereoselectivity.

  Enol醚1a-f在-78°C下进行溴化，生成的烷基1,2-二溴乙基醚经区域选择性偶联反应与炔丙基-镁溴反应，得到4-烷氧基-5-溴-1-戊炔2a-f，其在炔端用三甲基硅基保护。这些4-烷氧基-5-溴-1-三甲基硅基-1-戊炔3a-f通过γ-消除易于环化，以优异的总收率得到三甲基硅基保护的2-烷氧基乙炔基环丙烷4a-f。在适当条件下，可以选择性地制备(E)-4a-f。然而，溴对纯手性enol醚1e和1f的加成反应的立体选择性最多为64%（对于2f）。2-烷氧基-1-三甲基硅基乙炔基环丙烷(E/Z)-4可通过LDA或丁基锂去质子化，得到构型稳定的1-锂衍生物(E)-6，这些衍生物通过保留三元环的构型被活性亲电试剂（质子、羰基化合物、甲苯磺酰卤化物）捕获。2-烷氧基-1-乙炔基环丙烷5可用于将双环[3.3.0]辛烷片段通过多米诺式反应序列结合到环烯上，如通过(E)-5c与降冰片烯（14）以及δ环烯（20）的Pauson-Khand环加成反应，随后通过合理的立体选择性相互转化为四环和六环化合物anti/syn-19以及anti/syn-25/27所证明。
• Multimacrocyclic compounds. Part III. Attempts to prepare benzenoid cage compounds from novel polyacetylenes
  作者：A. J. Hubert

  DOI：10.1039/j39670000013

  日期：——

  Hexakis(pent-4-ynyl)benzene (III) and tetracyclo(28,12,0,02,15,016,29) dotetraconta-1,15,29-triene-8,22,36-triyne (X) have been prepared and cyclotrimerised on a Ziegler catalyst.

  六（戊-4-炔基）苯（III）和四环（28,12,0,0 2,15，0 16,29）dotetraconta-1,15,29三烯8,22,36-triyne（X ）已经制备并在齐格勒催化剂上环三聚。
• Multimacrocyclic compounds. Part IV. Internal trimerisation of the triple bonds of linear triynes on a Ziegler catalyst
  作者：A. J. Hubert

  DOI：10.1039/j39670001984

  日期：——

  The internal trimerisation of the triple bonds of linear triynes on a Ziegler catalyst gives tricyclic aromatic hydrocarbons. There is some evidence for the formation of a Dewar-like benzene as an intermediate during this “trimerisation.”

  齐格勒催化剂上线性三炔的三键的内部三聚产生三环芳烃。有证据表明在这种“三聚反应”过程中会形成杜瓦样苯作为中间体。
• Novel and Flexible Entries into Prostaglandins and Analogues Based on Ring Closing Alkyne Metathesis or Alkyne Cross Metathesis
  作者：Alois Fürstner、Karol Grela、Christian Mathes、Christian W. Lehmann

  DOI：10.1021/ja003119g

  日期：2000.12.1

  allows one to make a series of analogues starting from these common platforms, (iii) a small number of steps, and (iv) an excellent overall yield. The key alkyne metathesis reactions are efficiently catalyzed either by the tungsten alkylidyne complex (t-BuO)3W⋮CCMe3 or, preferentially, by a catalyst formed in situ from Mo[N(t-Bu)(Ar)]3 and CH2Cl2, the reactivity of which can be...

  适当官能化的环戊酮衍生物 12、13、19 和 37 作为合成各种前列腺素、前列腺素-1,15-内酯及其非天然类似物的常见前体。它们都包含一个 2-丁炔基实体，该实体通过包含闭环炔烃复分解/Lindlar 还原或通过炔烃交叉复分解 (ACM)/Lindlar 还原的序列加工成目标的完整 α 侧链。这些新方法的特点是 (i) 通过三组分偶联反应可随时获得所需的环戊烯酮底物，(ii) 固有的灵活性，允许从这些通用平台开始制造一系列类似物，(iii)步骤数少，以及 (iv) 出色的总产率。
• Stereoselective Synthesis of <i>Cis</i>- and <i>Trans</i>-Tetrasubstituted Vinyl Silanes Using a Silyl-Heck Strategy and Hiyama Conditions for Their Cross-Coupling
  作者：Michael F. Wisthoff、Sarah B. Pawley、Andrew P. Cinderella、Donald A. Watson

  DOI：10.1021/jacs.0c05382

  日期：2020.7.15

  report a palladium-catalyzed, three-component carbosilylation reaction of internal symmetrical alkynes, silicon electro-philes, and primary alkyl zinc iodides. Depending on the choice of ligand, stereoselective synthesis of either cis- or trans-tetrasubstituted vinyl silanes is possible. We also demonstrate conditions for the Hiyama cross-coupling of these products to prepare geometrically defined tetrasubstituted

  我们报告了钯催化的内部对称炔烃、硅亲电子试剂和伯烷基碘化锌的三组分碳硅烷化反应。根据配体的选择，顺式或反式四取代乙烯基硅烷的立体选择性合成是可能的。我们还展示了这些产品的 Hiyama 交叉偶联条件，以制备几何定义的四取代烯烃。