2-methoxy-9H-xanthene | 38731-89-4

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 苯并吡喃
• 英文名称: 2-methoxy-9H-xanthene
• CAS: 38731-89-4
• 化学式: C₁₄H₁₂O₂
• 分子量: 212.248
• InChiKey: QZTUHJIPLHLSPP-UHFFFAOYSA-N

物化性质

• 沸点：
  363.1±31.0 °C(Predicted)
• 密度：
  1.171±0.06 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  3.4
• 重原子数：
  16
• 可旋转键数：
  1
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.14
• 拓扑面积：
  18.5
• 氢给体数：
  0
• 氢受体数：
  2

反应信息

• 作为反应物：
  描述：

  2-methoxy-9H-xanthene 在 正丁基锂 、 乙醚 作用下， 生成 2-methoxy-xanthene-9-carboxylic acid
  参考文献：
  名称：

  McConnel et al., Journal of the Chemical Society, 1956, p. 812

  摘要：

  DOI：
• 作为产物：
  描述：

  2-Methoxyxanthydrol 在 三乙基硅烷 作用下， 以 二氯甲烷 、 三氟乙酸 为溶剂， 反应 0.5h， 以92%的产率得到2-methoxy-9H-xanthene
  参考文献：
  名称：

  Novel S-Xanthenyl Protecting Groups for Cysteine and Their Applications for the N^α-9-Fluorenylmethyloxycarbonyl (Fmoc) Strategy of Peptide Synthesis^1-3

  摘要：

  The 9H-xanthen-9-yl (Xan) and 2-methoxy-9H-xanthen-9-yl (2-Moxan) groups can be introduced onto sulfhydryl functions by S-alkylation reactions involving the corresponding xanthydrols, plus trifluoroacetic acid (TFA) as catalyst. Conversely, these groups are removed rapidly by acid in the presence of appropriate silane or thiol scavengers. The 3-methoxy-9H-xanthen-9-yl (3-Moxan) derivative was also studied, but abandoned for several reasons including challenging synthesis, excessive lability to acid, and insufficient stability in the presence of base. The N-alpha-9-fluorenyl-methyloxycarbonyl (Fmoc), S-Xan or 2-Moxan-protected cysteine derivatives were prepared and applied to the solid-phase syntheses of several model peptides. Selective removal of S-Xan and S-2-Moxan groups, while retaining tris(alkoxybenzyl)amide (PAL) anchoring, is best accomplished with TFA-CH2Cl2-Et3SiH (1:98.5:0.5), 25 degrees C, 2 h. Alternatively, oxidative deprotection of S-Xan or S-2-Moxan with iodine (10-20 equiv) or thallium(III) tris(trifluoroacetate) [Tl(tfa)(3)] (1-3 equiv) to provide disulfides can be carried out on peptide substrates both in solution and while polymer-bound. Compared to established chemistries with the acid-labile and oxidizable S-triphenylmethyl (Trt) group, S-Xan and S-2-Moxan gave equal or superior results in terms of peptide purities (including no detectable tryptophan alkylation) and overall yields.

  DOI：

  10.1021/jo961882g

文献信息

• Xanthan-ester and acridan substrates for horseradish peroxidase
  申请人：Tropix, Inc.

  公开号：US06162610A1

  公开（公告）日：2000-12-19

  Xanthan esters and acridans are substrates for horseradish peroxidase. These stable, enzymatically cleavable chemiluminescent esters are substrates for horseradish peroxidase which, together with peroxide is among the extensively used enzyme in enzyme-linked detection methods, including immunoassays, oligonucleotide detection and nucleic acid hybridization. The novel compounds are used, together with peroxide, alkali and the peroxidase, to indicate the presence and/or concentration of target compounds. The assays may be enhanced by the use of polymeric quaternary onium enhancement compounds or similar compounds selected to enhance the chemiluminescence emitted.

  黄原酯和丙酮酸酯是辣根过氧化物酶的底物。这些稳定的、酶可切割的化学发光酯是辣根过氧化物酶的底物，与过氧化物一起被广泛应用于酶联检测方法中，包括免疫分析、寡核苷酸检测和核酸杂交。这些新型化合物与过氧化物、碱和过氧化物酶一起被用来指示目标化合物的存在和/或浓度。通过使用聚合物季铵盐增强化合物或类似化合物来增强发出的化学发光，可以增强这些检测方法。
• Lewis acid-catalysed one pot synthesis of substituted xanthenes
  作者：Esther Böβ、Tim Hillringhaus、Jacqueline Nitsch、Martin Klussmann

  DOI：10.1039/c0ob00954g

  日期：——

  A direct synthesis of substituted xanthenes from salicylaldehydes and cyclohexenones or tetralones has been developed. The reaction is catalysed by Lewis acids like scandium triflate and furnishes substituted xanthenes in good to excellent yields using either microwave or thermal heating. Microwave heating results in significantly shortened reaction times of 30 min and generally higher yields.

  已开发出从水杨 aldehydes 和环己烯酮或四氢萘酮合成取代的香豆素的直接合成方法。该反应由路易斯酸（如三氟甲磺酸钪）催化，使用微波加热或热加热都能提供良好至优异的产率。微波加热显著缩短了反应时间至30分钟，并且通常能获得更高的产率。
• Visible-Light-Induced Aerobic Oxidation of Benzylic C(sp3)–H of Alkylarenes Promoted by DDQ, tert-Butyl Nitrite, and Acetic Acid
  作者：Zhenlu Shen、Decheng Pan、Yiqing Wang、Meichao Li、Xinquan Hu、Nan Sun、Liqun Jin、Baoxiang Hu

  DOI：10.1055/s-0037-1610678

  日期：2019.1

  photocatalytic aerobic oxidation of benzylic C(sp3)–H bonds proceeded in the presence of 2,3-dichloro-5,6-dicyano-1,4-benzoquinone, tert-butyl nitrite, and acetic acid. Advantages of this aerobic oxidation method include its relatively mild conditions, the use of visible-light irradiation instead of conventional thermal methods, the use of a low catalyst loading, and the ability to oxidize a range of alkyl­arenes

  在 2,3-二氯-5,6-二氰基-1,4-苯醌、亚硝酸叔丁酯和乙酸存在下，苄基 C(sp3)-H 键的可见光光催化有氧氧化进行。这种有氧氧化方法的优点包括其条件相对温和、使用可见光照射代替传统的热方法、使用低催化剂负载以及能够氧化一系列烷基芳烃，包括呫吨、噻吨和 9 ,10-二氢吖啶，以极好的收率生成相应的酮。
• 一种氧杂蒽酮类化合物的紫外光促进合成方 法
  申请人：浙江工业大学

  公开号：CN111057037B

  公开（公告）日：2021-07-23

  本发明公开了一种氧杂蒽酮类化合物的紫外光促进合成方法，以氧杂蒽类化合物为反应底物，空气中的氧气为氧化剂，反应底物在有机溶剂中，常温并在380～385nm紫外光照射条件下进行反应，反应结束后经分离处理得到所述的氧杂蒽酮类化合物。本发明所述的合成方法，以光照反应替代了传统的加热反应，可节约能源；不使用任何催化剂。
• Graphene-Oxide-Catalyzed Direct CH−CH-Type Cross-Coupling: The Intrinsic Catalytic Activities of Zigzag Edges
  作者：Hongru Wu、Chenliang Su、Rika Tandiana、Cuibo Liu、Chuntian Qiu、Yang Bao、Ji'en Wu、Yangsen Xu、Jiong Lu、Dianyuan Fan、Kian Ping Loh

  DOI：10.1002/anie.201802548

  日期：2018.8.20

  graphene oxide (GO)‐based materials for C−C cross‐coupling represents a significant advance in carbocatalysis. Although GO has been used widely in various catalytic reactions, the scope of reactions reported is quite narrow, and the relationships between the type of functional groups present and the specific activity of the GO are not well understood. Herein, we explore CH−CH‐type cross‐coupling of xanthenes

  用于C-C交叉偶联的基于氧化石墨烯（GO）的材料的开发代表了碳催化方面的重大进步。尽管GO已被广泛用于各种催化反应中，但是所报道的反应范围非常狭窄，并且对存在的官能团的类型与GO的比活性之间的关系还没有很好的理解。在本文中，我们探索了使用GO作为真正的碳催化剂而不是化学计量的反应物，将黄嘌呤与芳烃进行CH-CH型交叉偶联。进行了涉及分子类似物以及被捕集的中间体的机理研究，以探测活性位点，这些活性位点可以追溯到醌型官能团以及GO材料中的之字形边缘。GO催化的交叉脱氢偶联操作操作简单，显示了多个循环的可重复使用性，