5-methyl-2-[(4-methylphenyl)ethynyl]benzoxazole | 1221576-85-7

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 苯并恶唑类
• 英文名称: 5-methyl-2-[(4-methylphenyl)ethynyl]benzoxazole
• 英文别名: 5-methyl-2-(p-tolylethynyl)benzo[d]oxazole；2-(4-methylphenylethynyl)-5-methylbenzoxazole；5-Methyl-2-[2-(4-methylphenyl)ethynyl]-1,3-benzoxazole；5-methyl-2-[2-(4-methylphenyl)ethynyl]-1,3-benzoxazole
• CAS: 1221576-85-7
• 化学式: C₁₇H₁₃NO
• 分子量: 247.296
• InChiKey: JJTNBVGBTXJWQC-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  4.5
• 重原子数：
  19
• 可旋转键数：
  2
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.12
• 拓扑面积：
  26
• 氢给体数：
  0
• 氢受体数：
  2

反应信息

• 作为产物：
  描述：

  5-甲基苯并唑 、 4-甲苯基乙炔 在 Pd(II)(N-(3-(1-hydroxy-3-phenylpropan-2-yl carbamoyl)benzylidene)-2-methylpropan-2-amineoxide(-2H)) 、 caesium carbonate 、 silver(l) oxide 作用下， 以 N,N-二甲基甲酰胺 为溶剂， 反应 8.0h， 以75%的产率得到5-methyl-2-[(4-methylphenyl)ethynyl]benzoxazole
  参考文献：
  名称：

  Dehydrogenative and decarboxylative C–H alkynylation of heteroarenes catalyzed by Pd(II)–carbene complex

  摘要：

  The direct alkynylation of heteroarenes was accomplished with easily prepared Pd(II) carbene complex (Pd Cat.) by two complementary strategies. Pd Cat. catalysed cross-dehydrogenative coupling of terminal alkynes with heteroarenes was achieved in the first method and decarboxylative coupling of aryl propiolic acids with heteroarenes was investigated in the second method. Both the methodologies tolerate a broad variety of heteroarenes that include benzoxazoles, benzothiazoles, imidazole and benzimidazoles. (C) 2015 Elsevier Ltd. All rights reserved.

  DOI：

  10.1016/j.tet.2015.02.020

文献信息

• Highly Efficient and Versatile Pd-Catalyzed Direct Alkynylation of Both Azoles and Azolines
  作者：Seok Hwan Kim、Sukbok Chang

  DOI：10.1021/ol100488v

  日期：2010.4.16

  A highly efficient and versatile Pd-catalyzed direct alkynylation reaction of heterocycles with 1-bromoalkynes was developed. The substrate scope of the reaction was very broad to include not only azoles but also azolines for the first time, thus offering an important advance in the direct functionalization of heterocycles.

  开发了一种高效且通用的Pd催化杂环与1-溴代炔烃的直接炔基化反应。反应的底物范围非常广泛，首次不仅包括唑类，而且还包括偶氮类，因此在杂环的直接官能化方面提供了重要的进展。
• Room-Temperature Direct Alkynylation of Arenes with Copper Acetylides
  作者：Cédric Theunissen、Gwilherm Evano

  DOI：10.1021/ol502030y

  日期：2014.9.5

  C–H bond in azoles and polyhalogenated arenes can be smoothly activated by copper acetylides to give the corresponding alkynylated (hetero)arenes by simple reaction at room temperature in the presence of phenanthroline and lithium tert-butoxide under an oxygen atmosphere. These stable, unreactive, and readily available polymers act as especially efficient and practical reagents for the introduction

  唑和多卤代芳烃中的C–H键可以通过乙炔铜平滑活化，在氧气气氛下，在邻菲咯啉和叔丁醇锂存在下，在室温下通过简单反应，得到相应的炔基化（杂）芳烃。这些稳定的，无反应性的和容易获得的聚合物充当特别有效和实用的试剂，用于在非常温和的条件下将炔基引入众多的芳烃中。
• Palladium-Catalyzed Oxidative Alkynylation of Heterocycles with Terminal Alkynes under Air Conditions
  作者：Seok Hwan Kim、Jungho Yoon、Sukbok Chang

  DOI：10.1021/ol200154s

  日期：2011.3.18

  Pd-Catalyzed oxidative alkynylation of azoles with terminal alkynes was developed via simultaneous activation of both heterocyclic sp(2) C-H and alkynyl sp C-H bonds. The choice of palladium catalyst source and external base resulted in being important factors for performing the reaction with high efficiency and selectivity, and air was successfully utilized as an environmental oxidant in the present alkynylation procedure.
• Dehydrogenative and decarboxylative C–H alkynylation of heteroarenes catalyzed by Pd(II)–carbene complex
  作者：Thupakula Parsharamulu、Police Vishnuvardhan Reddy、Pravin R. Likhar、Mannepalli Lakshmi Kantam

  DOI：10.1016/j.tet.2015.02.020

  日期：2015.4

  The direct alkynylation of heteroarenes was accomplished with easily prepared Pd(II) carbene complex (Pd Cat.) by two complementary strategies. Pd Cat. catalysed cross-dehydrogenative coupling of terminal alkynes with heteroarenes was achieved in the first method and decarboxylative coupling of aryl propiolic acids with heteroarenes was investigated in the second method. Both the methodologies tolerate a broad variety of heteroarenes that include benzoxazoles, benzothiazoles, imidazole and benzimidazoles. (C) 2015 Elsevier Ltd. All rights reserved.