2-mesitylbenzoxazole | 956897-66-8

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 唑类
• 英文名称: 2-mesitylbenzoxazole
• 英文别名: 2-mesitylbenzo[d]oxazole；2-(2,4,6-Trimethylphenyl)-1,3-benzoxazole
• CAS: 956897-66-8
• 化学式: C₁₆H₁₅NO
• 分子量: 237.301
• InChiKey: HTZAESJBYMHEBS-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  4.5
• 重原子数：
  18
• 可旋转键数：
  1
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.19
• 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：

  N-(2-bromophenyl)-2,4,6-trimethylbenzamide 在 iron(III) chloride 、 2,2,6,6-四甲基-3,5-庚二酮 、 caesium carbonate 作用下， 以 N,N-二甲基甲酰胺 为溶剂， 反应 72.0h， 以16%的产率得到2-mesitylbenzoxazole
  参考文献：
  名称：

  Iron-Catalyzed Intramolecular O-Arylation: Synthesis of 2-Aryl Benzoxazoles

  摘要：

  A practical iron-catalyzed intramolecular O-arylation reaction and its application in the synthesis of benzoxazole derivatives, starting from the readily available 2-haloanilines, is presented. The key cyclization step involves the use of a combination of the cheap and environmentally friendly FeCl3 and 2,2,6,6-tetramethyl-3,5 heptanedione (TMHD) as the catalyst system.

  DOI：

  10.1021/ol800744y

文献信息

• Synthesis of 2-substituted pyrimidines and benzoxazoles via a visible-light-driven organocatalytic aerobic oxidation: enhancement of the reaction rate and selectivity by a base
  作者：Lin Wang、Zhi-Gang Ma、Xiao-Jing Wei、Qing-Yuan Meng、Deng-Tao Yang、Shao-Fu Du、Zi-Fei Chen、Li-Zhu Wu、Qiang Liu

  DOI：10.1039/c4gc00337c

  日期：——

  An efficient visible-light-driven photocatalytic oxidation of various 2-substituted dihydropyrimidines and phenolic imines has been achieved using an organic photocatalyst eosin Y bis(tetrabutyl ammonium salt) (TBA-eosin Y) and inexpensive oxidant molecular oxygen. With the aid of a base, significantly enhanced photoinduced electron transfer from substrates dihydropyrimidines or phenolic imines to the excited state of TBA-eosin Y has enabled the aerobic oxidation to yield 2-(methylthio)pyrimidines or 2-arylbenzoxazoles selectively.

  利用有机光催化剂藻红Y双(四丁基铵盐)(TBA-藻红Y)和廉价氧化剂分子氧，已经实现了各种2-取代二氢嘧啶和酚亚胺的高效可见光驱动光催化氧化反应。在碱的辅助下，从底物二氢嘧啶或酚亚胺到TBA-藻红Y激发态的显著增强的光诱导电子转移，使得空气氧化能够选择性地生成2-(甲硫基)嘧啶或2-芳基苯并噁唑。
• Bimetallic Cooperative Catalysis for Decarbonylative Heteroarylation of Carboxylic Acids via C‐O/C‐H Coupling
  作者：Chengwei Liu、Chong‐Lei Ji、Tongliang Zhou、Xin Hong、Michal Szostak

  DOI：10.1002/anie.202100949

  日期：2021.5.3

  Cooperative bimetallic catalysis is a fundamental approach in modern synthetic chemistry. We report bimetallic cooperative catalysis for the direct decarbonylative heteroarylation of ubiquitous carboxylic acids via acyl C‐O/C‐H coupling. This novel catalytic system exploits the cooperative action of a copper catalyst and a palladium catalyst in decarbonylation, which enables highly chemoselective synthesis

  协同双金属催化是现代合成化学的基本方法。我们报告了通过酰基 C-O/C-H 偶联对普遍存在的羧酸进行直接脱羰杂芳基化的双金属协同催化。这种新型催化体系利用铜催化剂和钯催化剂在脱羰基化中的协同作用，在没有预官能化或导向基团的情况下，通过羧酸与杂芳烃的偶联，能够高度化学选择性地合成重要的杂二芳基基序。这种协同脱羰方法使用常见的羧酸，并显示出非常广泛的底物范围（> 70 个示例），包括药物的后期修饰和生物活性剂的简化合成。进行了广泛的机理和计算研究，以深入了解反应的机理。关键步骤涉及通过铜-芳基物质与氧化加成/脱羰产生的钯（II）中间体的金属转移来交叉两个催化循环。
• Chelating palladium complexes containing pyridine/pyrimidine hydroxyalkyl di-functionalized N-heterocyclic carbenes: synthesis, structure, and catalytic activity towards C–H activation
  作者：Liangru Yang、Jinwei Yuan、Pu Mao、Qi Guo

  DOI：10.1039/c5ra21183b

  日期：——

  novel chelating palladium complexes containing pyridine/pyrimidine hydroxyalkyl di-functionalized N-heterocyclic carbenes (NHCs) via direct metallation of the precursor imidazolium salts is presented. The structure has been characterized unambiguously by X-ray single crystal analysis. Catalytic activity investigation showed that the complexes catalyse the direct C–H bond arylation of (benzo)oxazoles efficiently

  含吡啶/嘧啶羟双官能螯合新颖的钯络合物的合成ñ -杂环卡宾（NHC的）通过将前体咪唑鎓盐的直接金属化呈现。通过X射线单晶分析清楚地表征了该结构。催化活性研究表明，当以t BuOLi为碱和DMF为溶剂时，该配合物可有效催化（苯并）恶唑的直接C–H键芳基化。
• Synthesis of Benzoxazoles Using Electrochemically Generated Hypervalent Iodine
  作者：Olesja Koleda、Timo Broese、Jan Noetzel、Michael Roemelt、Edgars Suna、Robert Francke

  DOI：10.1021/acs.joc.7b01686

  日期：2017.11.17

  The indirect (“ex-cell”) electrochemical synthesis of benzoxazoles from imines using a redox mediator based on the iodine(I)/iodine(III) redox couple is reported. Tethering the redox-active iodophenyl subunit to a tetra-alkylammonium moiety allowed for anodic oxidation to be performed without supporting electrolyte. The mediator salt can be easily recovered and reused. Our “ex-cell” approach toward

  据报道，使用基于碘（I）/碘（III）氧化还原对的氧化还原介体从亚胺间接（“细胞外”）电化学合成苯并恶唑。将氧化还原活性的碘代苯基亚基束缚到四烷基铵部分上，从而可以在不支持电解质的情况下进行阳极氧化。介体盐可以很容易地回收和再利用。我们对苯并恶唑进行电合成的“细胞外”方法与一系列对氧化还原敏感的官能团兼容。在控制实验和DFT计算的基础上，提出了前所未有的协同消除苯并恶唑形成的机理。
• Visible <scp>Light‐Induced Copper‐Catalyzed</scp> C—H Arylation of Benzoxazoles ^†
  作者：Xiaodong Ma、Guozhu Zhang

  DOI：10.1002/cjoc.201900527

  日期：2020.11

  copper‐catalyzed arylation of sp2 C—H bonds of azoles has been developed. The method employs aryl halide as the coupling partner, lithium alkoxide as base. A variety of azoles including benzooxazole and benzothiazole can be arylated. Furthermore, electron‐poor heterocycles such as thiophene possessing one electron‐withdrawing group can also be arylated.

  已经开发了一种可见光诱导的铜的唑的sp 2 C-H键芳基化的通用方法。该方法使用卤化芳基作为偶联伙伴，使用醇锂作为碱。可以使包括苯并恶唑和苯并噻唑在内的多种唑进行芳基化。此外，贫电子杂环如噻吩具有一个吸电子基团也可以芳基化。