(5-phenylpent-1-yn-1-yl)lithium | 105486-30-4

• 分子结构分类: 有机化合物 - 苯类化合物 - 苯和取代衍生物
• 英文名称: (5-phenylpent-1-yn-1-yl)lithium
• CAS: 105486-30-4
• 化学式: C₁₁H₁₁Li
• 分子量: 150.149
• InChiKey: SOEFNHWVWFPAKL-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.14
• 重原子数：
  12.0
• 可旋转键数：
  3.0
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.27
• 拓扑面积：
  0.0
• 氢给体数：
  0.0
• 氢受体数：
  0.0

反应信息

• 作为反应物：
  描述：

  (5-phenylpent-1-yn-1-yl)lithium 以 四氢呋喃 为溶剂， 生成 Acetic acid 6-phenyl-1-(5-trimethylsilanyl-furan-3-yl)-hex-2-ynyl ester
  参考文献：
  名称：

  Singlet oxygen oxidation of substituted furans to 5-hydroxy-2(5H)-furanone

  摘要：

  The conditions for the regiospecific singlet oxygen oxidation of various 2,4-disubstituted furans 9 to 4-substituted-2 (5H)-furanones 3 are developed. The presence of a C-2 substituent (e.g., trimethylsilyl, tert-butyldimethylsilyl, or tributylstannyl) in 9 is an absolute requirement for the formation of the 4-substituted-5-hydroxy-2(5H)-furanone regioisomer 3. When the C-2 substituent is triethylsilyl (TES) or TBDMS, however, apart from 3, the corresponding 5-trialkylsiloxy derivative 11 is also isolated in a significant amount. These silyl acetals are unexpectedly stable but can be hydrolyzed back to 3 on stirring with dilute acid. The formation of silyl acetals, to our knowledge, has never been reported in the singlet oxygen oxidation of (trialkylsilyl)furan. A plausible mechanism for their formation is proposed. The presence of a catalytic amount of water in the oxidation of 2-(trialkylsilyl)-4-substituted-furans not only eliminates the formation of the silyl acetals but also speeds up the rate of the oxidation process. Moreover, the oxidation can then be carried out at 0-degrees-C instead of at -78-degrees-C. Oxidation of 2-(1-hydroxyalkyl)-4-substituted-furans in the absence of a reducing agent gives little or no sign of 2,5-disubstituted-6-hydroxy-3(2H)-pyranone 23 but instead 26 selectively. Thus, the (1-hydroxy)alkyl group can be utilized as the trialkylsilyl or trialkylstannyl group in dictating the regioselectivity in the singlet oxygen oxidation of substituted furans.

  DOI：

  10.1021/jo00025a012

文献信息

• Modular Cyclopentenone Synthesis through the Catalytic Molecular Shuffling of Unsaturated Acid Chlorides and Alkynes
  作者：Yong Ho Lee、Elliott H. Denton、Bill Morandi

  DOI：10.1021/jacs.0c10832

  日期：2020.12.16

  general strategy for the intermolecular synthesis of polysubstituted cyclopentenones using palladium catalysis. Overall, this reaction is achieved via a molecular shuffling process involving an alkyne, an α,β-unsaturated acid chloride, which serves as both the alkene and carbon monoxide source, and a hydrosilane to create three new C-C bonds. This new carbon monoxide-free pathway delivers the products

  我们描述了使用钯催化分子间合成多取代环戊烯酮的一般策略。总体而言，该反应是通过涉及炔烃、α,β-不饱和酰氯（作为烯烃和一氧化碳来源）和氢硅烷的分子改组过程实现的，以产生三个新的 CC 键。这种新的无一氧化碳途径提供了具有优异产量的产品。此外，区域选择性是对环戊烯酮合成常规方法的补充。此外，还提出了一组区域和化学发散反应，以强调这种新策略的合成潜力。
• Chemoselective Activation of Diethyl Phosphonates: Modular Synthesis of Biologically Relevant Phosphonylated Scaffolds
  作者：Pauline Adler、Amandine Pons、Jing Li、Jörg Heider、Bogdan R. Brutiu、Nuno Maulide

  DOI：10.1002/anie.201806343

  日期：2018.10

  Phosphonates have garnered considerable attention for years owing to both their singular biological properties and their synthetic potential. State‐of‐the‐art methods for the preparation of mixed phosphonates, phosphonamidates, phosphonothioates, and phosphinates rely on harsh and poorly selective reaction conditions. We report herein a mild method for the modular preparation of phosphonylated derivatives

  多年来，由于其独特的生物学特性和合成潜力，膦酸酯已经引起了相当大的关注。用于制备混合膦酸酯，膦酰胺，膦硫代酸酯和次膦酸酯的最新方法依赖于苛刻且选择性差的反应条件。我们在此报告了一种温和的方法，用于模块化制备膦酰化衍生物，其中一些表现出有趣的生物学活性，其基于三氟甲磺酸酐的化学选择性活化。该程序可以用广泛的O，S，N和C亲核试剂进行灵活甚至重复的取代。
• An Alkyne Hydrosilylation-Oxidation Strategy for the Selective Installation of Oxygen Functionality
  作者：Barry M. Trost、Zachary T. Ball、Kai M. Laemmerhold

  DOI：10.1021/ja051578h

  日期：2005.7.1

  Alkynes bearing propargylic, homopropargylic, and bishomopropargylic hydroxyl groups are shown to serve as precursors for ketone or alpha-hydroxy ketone functionality. The approach hinges on the intermediacy of vinylsilanes created through regioselective hydrosilylation catalyzed by the complex [Cp*Ru(MeCN)3]PF6. Several oxidative pathways of linear and cyclic vinylsilanes are studied, and the possibility

  显示带有炔丙基、均炔丙基和双炔丙基羟基的炔可作为酮或α-羟基酮官能团的前体。该方法取决于通过复合物 [Cp*Ru(MeCN)3]PF6 催化的区域选择性氢化硅烷化产生的乙烯基硅烷的中间体。研究了线性和环状乙烯基硅烷的几种氧化途径，并证明了环状乙烯基硅烷非对映选择性环氧化的可能性。该序列构成立体选择性醛醇、高-羟醛和双-羟醛型过程的等价物。该方法应用于哌啶生物碱spectaline的短程合成。
• Synthesis of Arylallenes by Palladium-Catalyzed Retro-Propargylation of Homopropargyl Alcohols
  作者：Sayuri Hayashi、Koji Hirano、Hideki Yorimitsu、Koichiro Oshima

  DOI：10.1021/ja800986m

  日期：2008.4.1

  Treatment of tertiary homopropargyl alcohol with aryl halide under palladium catalysis provided arylallenes regioselectively. The reaction includes retropropargylation, which proceeds in a concerted fashion via a cyclic transition state and transfers the stereochemistry of homopropargyl alcohols through C-C bond cleavage. The present method enables the use of homopropargyl alcohols as allenylmetal equivalents.