1-methoxy-4-(3-methylbut-1-en-2-yl)benzene | 28115-04-0

• 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: 1-methoxy-4-(3-methylbut-1-en-2-yl)benzene
• CAS: 28115-04-0
• 化学式: C₁₂H₁₆O
• 分子量: 176.258
• InChiKey: BTHZXPYUSHIECI-UHFFFAOYSA-N

物化性质

• 沸点：
  258.0±9.0 °C(Predicted)
• 密度：
  0.914±0.06 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  4.1
• 重原子数：
  13
• 可旋转键数：
  3
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.33
• 拓扑面积：
  9.2
• 氢给体数：
  0
• 氢受体数：
  1

反应信息

• 作为反应物：
  描述：

  1-methoxy-4-(3-methylbut-1-en-2-yl)benzene 在 C₃₀H₄₄CoN₃ 、 氢气 作用下， 以 苯 为溶剂， 22.0 ℃ 、405.33 kPa 条件下， 反应 24.0h， 以98%的产率得到1-methoxy-4-(3-methylbutan-2-yl)benzene
  参考文献：
  名称：

  EnantiopureC₁-Symmetric Bis(imino)pyridine Cobalt Complexes for Asymmetric Alkene Hydrogenation

  摘要：

  Enantiopure C-1-symmetric bis(imino)pyridine cobalt chloride, methyl, hydride, and cyclometalated complexes have been synthesized and characterized. These complexes are active as catalysts for the enantioselective hydrogenation of geminal-disubstituted olefins.

  DOI：

  10.1021/ja300503k
• 作为产物：
  描述：

  4-甲氧基苯甲腈 在 正丁基锂 、 copper(I) bromide 作用下， 以 四氢呋喃 、 2-甲基四氢呋喃 、 正己烷 为溶剂， 反应 8.83h， 生成 1-methoxy-4-(3-methylbut-1-en-2-yl)benzene
  参考文献：
  名称：

  EnantiopureC₁-Symmetric Bis(imino)pyridine Cobalt Complexes for Asymmetric Alkene Hydrogenation

  摘要：

  Enantiopure C-1-symmetric bis(imino)pyridine cobalt chloride, methyl, hydride, and cyclometalated complexes have been synthesized and characterized. These complexes are active as catalysts for the enantioselective hydrogenation of geminal-disubstituted olefins.

  DOI：

  10.1021/ja300503k

文献信息

• Cu(OTf)2 catalysed [6+2] cycloaddition reaction for the synthesis of highly substituted pyrrolo[1,2-a]indoles: rapid construction of the yuremamine core
  作者：Dattatraya H. Dethe、Raghavender Boda、Saikat Das

  DOI：10.1039/c3cc40617b

  日期：——

  Lewis acid catalysed [6+2] cycloaddition reaction for the synthesis of pyrrolo[1,2-a]indoles generating three contiguous stereocenters in a highly regio- and diastereoselective manner has been developed and further applied for the construction of the fully functionalized tricyclic core of yuremamine.

  路易斯酸催化的[6 + 2]环加成反应用于合成吡咯并[1,2-a]吲哚，以高度区域和非对映选择性的方式产生三个连续的立体中心，并已进一步用于构建完全功能化的三环核的尤里明。
• A transition-metal-free & diazo-free styrene cyclopropanation
  作者：Ana G. Herraiz、Marcos G. Suero

  DOI：10.1039/c9sc02749a

  日期：——

  An operationally simple and broadly applicable novel cyclopropanation of styrenes using gem-diiodomethyl carbonyl reagents has been developed. Visible-light triggered the photoinduced generation of iodomethyl carbonyl radicals, able to cyclopropanate a wide array of styrenes with excellent chemoselectivity and functional group tolerance. To highlight the utility of our photocyclopropanation, we demonstrated

  已经开发出一种操作简单且广泛适用的新型苯乙烯环丙烷化反应，该反应使用偕二碘甲基羰基试剂。可见光触发光诱导产生碘甲基羰基自由基，能够使多种苯乙烯环丙烷化，具有优异的化学选择性和官能团耐受性。为了突出我们的光环丙烷化的实用性，我们展示了生物分子衍生物的后期功能化。
• Electrochemical [4+2] Annulation‐Rearrangement‐Aromatization of Styrenes: Synthesis of Naphthalene Derivatives
  作者：Yueyue Ma、Jufeng Lv、Chengyu Liu、Xiantong Yao、Guoming Yan、Wei Yu、Jinxing Ye

  DOI：10.1002/anie.201902315

  日期：2019.5.13

  We report the first electrochemical strategy to synthesize functionalized naphthalene derivatives through [4+2] annulation—rearrangement–aromatization from styrenes under mild conditions. The electrolysis does not require metals, oxidants and high valence substrates, indicating the atom and step‐economy ideals. The dehydrodimer produced through [4+2] cycloaddition of 4‐methoxy α‐methyl styrene is isolated

  我们报告了第一种电化学策略，通过在温和的条件下通过[4 + 2]苯乙烯的重环-重排-芳构化来合成官能化的萘衍生物。电解不需要金属，氧化剂和高价底物，这表明了原子和阶跃经济的理想选择。分离出4-甲氧基α-甲基苯乙烯的[4 + 2]环加成反应产生的脱氢二聚体，并证明是随后氧化脱氢形成碳阳离子的关键中间体，该碳阳离子经过重排-芳构化得到最终产物。该反应代表了一步即可构建多取代萘嵌段的强大途径。
• Lewis Acid Catalyzed Transfer Hydromethallylation for the Construction of Quaternary Carbon Centers
  作者：Johannes C. L. Walker、Martin Oestreich

  DOI：10.1002/anie.201909852

  日期：2019.10.21

  of this surrogate in the hydromethallylation of electron-rich styrene derivatives provided sterically congested quaternary carbon centers. The reaction proceeds by C(sp3 )-C(sp3 ) bond formation at a tertiary carbenium ion that is generated by alkene protonation. The possibility of two concurrent mechanisms is proposed on the basis of mechanistic experiments using a deuterated surrogate.

  报告了基于环己-1,4-二烯的异丁烯气体替代物的设计和克级合成。使用高度缺电子的路易斯酸 B(C6 F5 )3 ，将该替代物应用于富电子苯乙烯衍生物的加氢甲基烯丙基化中，提供了空间拥挤的季碳中心。该反应通过在烯烃质子化产生的叔碳正离子处形成 C(sp3 )-C(sp3 ) 键来进行。基于使用氘化替代物的机械实验，提出了两种并发机制的可能性。
• Lifetimes and UV-visible absorption spectra of benzyl, phenethyl, and cumyl carbocations and corresponding vinyl cations. A laser flash photolysis study
  作者：Frances L Cozens、V M Kanagasabapathy、Robert A McClelland、Steen Steenken

  DOI：10.1139/v99-210

  日期：1999.12.5

  Benzyl (4-MeO, 4-Me, and 4-methoxy-1-naphthylmethyl), phenethyl (4-Me₂N, 4-MeO, 3,4-(MeO)₂, 4-Me, 3-Me, 4-F, 3-MeO, 2,6-Me₂, parent, and 4-methoxy-1-naphthylethyl) and cumyl (4-Me₂N, 4-MeO, 4-Me, parent) cations have been studied by laser flash photolysis (LFP) in 2,2,2-trifluoroethanol (TFE) and 1,1,1,3,3,3-hexafluoroisopropanol (HFIP). In most cases styrene or α-methylstyrene precursors were employed for the phenethyl and cumyl ions, the intermediate being obtained by solvent protonation of the excited state. Benzyl cations were generated by photoheterolysis of trimethylammonium and chloride precursors. While a 4-MeO substituent provides sufficient stabilization to permit observation of cations in TFE, cations with less stabilizing substituents usually require the less nucleophilic HFIP. Even in this solvent, the parent benzyl cation is too short-lived (lifetime <20 ns) to be observed. When generated in HFIP, phenethyl cations can be seen to react with unphotolyzed styrene, giving rise to dimer cations that are observed to grow in as the initial phenethyl cation decays. The dimer cations, in common with the oligomer cations seen in cationic styrene polymerization, have a λ_max 15-20 nm higher than the monomer and react with both solvent and styrene several orders of magnitude more slowly. This stabilization relative to the phenethyl may reflect an interaction with the aryl group present at the gamma-carbon. Cations 4-MeOC₆H₄C⁺(R)-CH₃ (R = Me, Et, i-Pr, t-Bu, cyclopropyl, C₆H₅, 4-MeOC₆H₄) were generated in TFE via the photoprotonation route. The alkyl series shows that steric effects are important in the decay reaction. The cation with R = cyclopropyl is a factor of 1.5 less reactive than the cation where R = phenyl. Several vinyl cations have also been generated by photoprotonation of phenylacetylenes. ArC⁺=CH₂ has a reactivity very similar to that of its analog ArC⁺H-CH₃, the vinyl cation being slightly (factors of 2-5) shorter-lived. For the various series of cations, including vinyl, substituents in the aryl ring have a consistent effect on the λ_max, a shift to higher wavelength relative to hydrogen of 15 nm for 4-Me, 30 nm for 4-MeO, and 50 nm for 4-Me₂N.Key words: photogenerated carbocations, carbocation lifetime, styrene, photoprotonation.

  苯甲基（4-MeO，4-Me和4-甲氧基-1-萘基甲基）、苯乙基（4-Me2N，4-MeO，3,4-(MeO)2，4-Me，3-Me，4-F，3-MeO，2,6-Me2，母体和4-甲氧基-1-萘基乙基）和叔丁基（4-Me2N，4-MeO，4-Me，母体）阳离子在2,2,2-三氟乙醇（TFE）和1,1,1,3,3,3-六氟异丙醇（HFIP）中通过激光闪光光解（LFP）进行了研究。在大多数情况下，苯乙烯或α-甲基苯乙烯前体被用于苯乙基和叔丁基离子，中间体通过溶剂质子化激发态而获得。苯甲基阳离子是通过三甲基铵和氯化物前体的光异裂生成的。虽然4-MeO取代基提供了足够的稳定性以在TFE中观察到阳离子，但具有较少稳定取代基的阳离子通常需要较不亲核的HFIP。即使在这种溶剂中，母体苯甲基阳离子也太短寿命（寿命<20 ns）而无法观察到。在HFIP中生成的苯乙基阳离子可以看到与未经光解的苯乙烯反应，导致观察到的二聚体阳离子在初始苯乙基阳离子衰减时增长。与阳离子苯乙烯聚合中观察到的寡聚体阳离子一样，二聚体阳离子的λmax比单体高15-20 nm，并且与溶剂和苯乙烯反应速度慢几个数量级。相对于苯乙基的这种稳定性可能反映了与伽马碳上存在的芳基的相互作用。在TFE中通过光质子化途径生成了4-MeOC6H4C+(R)-CH3（R = Me，Et，i-Pr，t-Bu，环丙基，C6H5，4-MeOC6H4）阳离子。烷基系列表明立体效应在衰减反应中很重要。当R = 环丙基时，其反应性比R = 苯基的阳离子少1.5倍。还通过对苯乙炔的光质子化生成了几种乙烯阳离子。ArC+=CH2的反应性与其类似物ArC+H-CH3非常相似，乙烯阳离子寿命略短（2-5倍因子）。对于包括乙烯在内的各系列阳离子，芳香环中的取代基对λmax有一致的影响，相对于氢的15 nm的4-Me，30 nm的4-MeO和50 nm的4-Me2N的波长偏移。关键词：光产生的碳正离子，碳正离子寿命，苯乙烯，光质子化。