(E)-5-methylene-2-styryl-4,5-dihydrooxazole | 1214921-90-0

• 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: (E)-5-methylene-2-styryl-4,5-dihydrooxazole
• 英文别名: 5-methylidene-2-[(E)-2-phenylethenyl]-4H-1,3-oxazole
• CAS: 1214921-90-0
• 化学式: C₁₂H₁₁NO
• 分子量: 185.225
• InChiKey: UVRYEENQHAABMG-BQYQJAHWSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.3
• 重原子数：
  14
• 可旋转键数：
  2
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.08
• 拓扑面积：
  21.6
• 氢给体数：
  0
• 氢受体数：
  2

反应信息

• 作为反应物：
  描述：

  (E)-5-methylene-2-styryl-4,5-dihydrooxazole 在 N-氯代丁二酰亚胺 作用下， 以 二氯甲烷 为溶剂， 反应 48.0h， 以16%的产率得到(E)-5-(chloromethyl)-2-styryloxazole
  参考文献：
  名称：

  炔丙基酰胺的环化反应：轻度接触恶唑衍生物

  摘要：

  研究了底物范围，金催化的恶唑合成的机理以及在侧链上具有不同脂族，芳族和官能团的底物。甚至具有多个炔丙基酰胺基团的分子也可以轻松转化，从而提供具有令人感兴趣的光学特性的二恶唑和三恶唑。此外，还研究了金（I）催化亚烷基的合成范围。这些恶唑合成的可分离中间体的进一步官能化得到了发展，并可以获得螯合配体。Barluenga试剂的使用为从炔丙基酰胺获得具有合成价值的碘代亚烷基新恶唑提供了一种新的，温和的途径，该试剂优于其他卤素来源。

  DOI：

  10.1002/chem.200902472
• 作为产物：
  描述：

  N-(prop-2-yn-1-yl)cinnamamide 在 bis(4-methoxypyridine)silver(I) hexafluorophosphate 作用下， 以 二氯甲烷 为溶剂， 反应 24.0h， 以84%的产率得到(E)-5-methylene-2-styryl-4,5-dihydrooxazole
  参考文献：
  名称：

  银催化的炔丙基酰胺到恶唑啉的环化

  摘要：

  在双（吡啶基）银（I）配合物催化的炔丙基酰胺环化过程中观察到配体促进作用，电子需求意外逆转至类似的NH加成反应。发现该催化剂对内部炔烃底物有效，为5 -exo-dig产物提供了独特的选择性。重点讨论了金和银催化工艺之间选择性分布的差异。

  DOI：

  10.1002/adsc.201500610

文献信息

• Construction of Chiral Quaternary Carbon Centers via Asymmetric Metal Carbene <i>gem</i>‐Dialkylation
  作者：Shanliang Dong、Kemiao Hong、Zhijing Zhang、Jingjing Huang、Xiongda Xie、Haoxuan Yuan、Wenhao Hu、Xinfang Xu

  DOI：10.1002/anie.202302371

  日期：2023.6.26

  An enantioselective three-component reaction of α-diazo ketones with alkenes and 1,3,5-triazines is reported, which leads to poly-functionalized chiral ketones with excellent enantioselectivity. This unprecedented metal carbene gem-dialkylation reaction features a cascade formal asymmetric allylation and aminomethylation process with concomitant construction of all-carbon quaternary stereocenters using

  报道了 α-重氮酮与烯烃和 1,3,5-三嗪的对映选择性三组分反应，这导致了具有优异对映选择性的多官能化手性酮。这种前所未有的金属卡宾宝石二烷基化反应具有级联的形式不对称烯丙基化和氨甲基化过程，同时使用现成的材料构建全碳季立构中心。
• Facile, Selective, and Regiocontrolled Synthesis of Oxazolines and Oxazoles Mediated by ZnI₂ and FeCl₃
  作者：Gopal Chandru Senadi、Wan-Ping Hu、Jia-Shing Hsiao、Jaya Kishore Vandavasi、Chung-Yu Chen、Jeh-Jeng Wang

  DOI：10.1021/ol301980g

  日期：2012.9.7

  An expedient method for a direct approach to the selective and regiocontrolled synthesis of 2-oxazolines and 2-oxazoles mediated by ZnI2 and FeCl3 is described. A Lewis acid promoted cyclization of acetylenic amide with various functionalities was well tolerated to give 2-oxazolines and 2-oxazoles in good to excellent yields under mild reaction conditions.
• Triaryl-Like MONO-, BIS-, and TRISKITPHOS Phosphines: Synthesis, Solution NMR Studies, and a Comparison in Gold-Catalyzed Carbon–Heteroatom Bond Forming 5-<i>exo</i>-dig and 6-<i>endo</i>-dig Cyclizations
  作者：Simon Doherty、Julian G. Knight、Daniel O. Perry、Nicholas A. B. Ward、Dror M. Bittner、William McFarlane、Corinne Wills、Michael R. Probert

  DOI：10.1021/acs.organomet.6b00146

  日期：2016.5.9

  A homologous series of triaryl-like KITPHOS-type monophosphines containing one, two, or three bulky 12-phenyl-9,10-dihydro-9,10-ethenoanthracene (KITPHOS) units have been developed, and the influence of increasing steric bulk on their efficacy as ligands in gold(I)-catalyzed carbon-heteroatom bond-forming cyclizations has been investigated. Detailed solution NMR studies on Ph-TRISKITPHOS, its oxide, and the corresponding gold(I) chloride adduct identified a conformational exchange process involving a concerted librational motion of the individual anthracene-derived organic substituents about their P-C bonds. The cessation of this motion at reduced temperatures lowers the molecular symmetry such that the two C6H4 rings in each of the KITPHOS units become inequivalent; a lower energy process involving restricted rotation of the biaryl-like phenyl ring has also been identified. Electrophilic gold(I) complexes of these triaryl-like KITPHOS monophosphines catalyze the 5-exo-dig cycloisomerization of propargyl amides to afford the corresponding methylene oxazolines, which were used in a subsequent tandem carbonyl-ene reaction to afford functionalized 2 -substituted oxazolines. A comparative survey revealed that catalyst efficiency for cycloisomerization decreases in the order MONOKITPHOS = BISKITPHOS > PPh3 > TRISKITPHOS. The optimum system also catalyzes the selective 6-endo-dig cyclization of 2-alkynylbenzyl alcohols, 2-alkynylbenzoic acid, and 2-phenylethynyl benzamides; gratifyingly, in several cases the yields obtained are markedly higher and/or reaction times significantly shorter than those previously reported for related gold catalysts. Moreover, these are the first examples of gold(I)-catalyzed 6-endo-dig cycloisomerizations involving 2-phenylethynyl benzamides and, reassuringly, the optimum gold(I)/MONOKITPHOS systems either rivaled or outperformed existing silver or palladium based catalysts. The steric parameters of this homologous series of phosphines have been quantified and compared with selected triarylphosphines using a combination of Solid -G calculations, to determine the percentage of the metal coordination sphere shielded by the phosphine (the G parameter), and Salerno molecular buried volume calculations (SambVca) to determine the percent buried volume (%V-bur); the corresponding Tolman cone angles have also been determined from correlations.