toluene-4-sulfonic acid pent-4-enyl ester | 19300-54-0

• 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: toluene-4-sulfonic acid pent-4-enyl ester
• 英文别名: pent-4-en-1-yl 4-methylbenzenesulfonate；4-pentenyl 4-methylbenzenesulfonate；4-pentenyl tosylate；pent-4-enyl 4-methylbenzenesulfonate
• CAS: 19300-54-0
• 化学式: C₁₂H₁₆O₃S
• 分子量: 240.323
• InChiKey: UBHNQKMTBYZSMM-UHFFFAOYSA-N

物化性质

• 熔点：
  78 °C
• 沸点：
  122-126 °C(Press: 0.03 Torr)
• 密度：
  1.117±0.06 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  2.9
• 重原子数：
  16
• 可旋转键数：
  6
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.33
• 拓扑面积：
  51.8
• 氢给体数：
  0
• 氢受体数：
  3

反应信息

• 作为反应物：
  描述：

  toluene-4-sulfonic acid pent-4-enyl ester 在 2-萘硫醇 作用下， 以 氘代苯 、 N,N-二甲基甲酰胺 为溶剂， 反应 14.08h， 生成 2-甲基四氢呋喃
  参考文献：
  名称：

  Ring Closure Reactions of Substituted 4-Pentenyl-1-oxy Radicals. The Stereoselective Synthesis of Functionalized Disubstituted Tetrahydrofurans

  摘要：

  N-(Alkyloxy)pyridine-2( VT)-thiones 3 and benzenesulfenic acid O-esters 5 have been synthesized from substituted 4-pentenols 1 or the derived tosylates. Compounds 3 and 5 are efficient sources of free alkoxy radicals 6 which undergo synthetically useful fast ring closure reactions 6 --> 8 [k(exo) = (2 +/- 1) x 10(8) s(-1) to (6 +/- 2) x 10(9) s(-1) (T = 30 +/- 0.2 degrees C)]. Tetrahydrofurfuryl radicals 8 can be trapped with, e.g., hydrogen or chlorine atom donors to afford either trans- or cis-disubstituted tetrahydrofurans 10 or 12 depending on the substitution pattern of the 4-pentenyloxy radical. Substituted tetrahydropyrans 11 or 13 are formed in the minor 6-endo-trig cyclization. According to the data of competition kinetics, the observed stereoselectivities in free alkoxy radical cyclizations arise from steric interactions between the substituents in the transition state of the ring closure reactions. Alkyl substituents cause small differences in the measured relative rate constants of B-exo cyclizations which are reminiscent of the data obtained from the rearrangements of alkyl-substituted 5-hexenyl radicals. Likewise, a stereochemical model for oxygen radical cyclization is proposed where the pentenyloxy chain adopts a six-membered, chairlike transition state with the alkyl substituents preferentially situated in the pseudoequatorial positions leading to 2,5-trans-, 2,4-cis-, and 2,3-trans-substituted tetrahydrofurfuryl radicals 8 as the major intermediates.

  DOI：

  10.1021/jo00126a021
• 作为产物：
  描述：

  4-戊烯-1-醇 以65%的产率得到
  参考文献：
  名称：

  ASHCROFT, M. R.;BOUGEARD, P.;BURY, A.;COOKSEY, CH. J.;JOHNSON, M. D.;HUNG+, J. ORG. CHEM., 1984, 49, N 10, 1751-1761

  摘要：

  DOI：

文献信息

• Catalytic Azido‐Hydrazination of Alkenes Enabled by Visible Light: Mechanistic Studies and Synthetic Applications
  作者：Peng Wang、Yunxuan Luo、Songsong Zhu、Dengfu Lu、Yuefa Gong

  DOI：10.1002/adsc.201901041

  日期：2019.12.17

  visible‐light‐enabled catalytic intermolecular azido‐hydrazination method for unactivated alkenes is developed via an orderly radical addition sequence. This transformation features metal‐free and redox‐neutral conditions and is applicable to a wide range of alkenes with commercially available reagents. Mechanistic and kinetic studies reveal that the efficient generation of azide radical enabled by fluorenone

  通过有序的自由基加成顺序，开发出了一种可在可见光下催化的未活化烯烃分子间叠氮酰肼化方法。这种转变具有无金属和氧化还原中性的条件，适用于使用市售试剂的多种烯烃。力学和动力学研究表明，芴酮在可见光下有效生成叠氮化物自由基对于该方法至关重要。通过该反应制备的β-叠氮基烷基肼可方便地衍生为有价值的合成构件，并且其中一种产品已成功用于（±）-依鲁替尼的全合成，用于治疗B细胞癌。
• Mechanistically Guided Design of Ligands That Significantly Improve the Efficiency of CuH-Catalyzed Hydroamination Reactions
  作者：Andy A. Thomas、Klaus Speck、Ilia Kevlishvili、Zhaohong Lu、Peng Liu、Stephen L. Buchwald

  DOI：10.1021/jacs.8b09565

  日期：2018.10.24

  Using a mechanically guided ligand design approach, a new ligand (SEGFAST) for the CuH-catalyzed hydroamination reaction of unactivated terminal olefins has been developed, providing a 62-fold rate increase over reactions compared to DTBM-SEGPHOS, the previous optimal ligand. Combining the respective strengths of computational chemistry and experimental kinetic measurements, we were able to quickly

  采用机械引导配体设计方法，开发了一种用于 CuH 催化未活化末端烯烃加氢胺化反应的新配体 (SEGFAST)，与之前的最佳配体 DTBM-SEGPHOS 相比，反应速率提高了 62 倍。结合计算化学和实验动力学测量的各自优势，我们能够快速识别导致更有效配体的潜在修饰，从而避免合成和测试大型配体库。通过优化有吸引力的非共价配体-底物相互作用和催化剂在反应条件下的稳定性的组合，我们能够识别出一种微调的杂化配体，它可以大大加快未活化烯烃的加氢速率。此外，设计了一种模块化且稳健的合成序列，使得这些新颖的杂化配体结构能够进行实用的克级合成。
• Visible-light-promoted photocatalyst- and additive-free intermolecular trifluoromethyl-thio(seleno)cyanation of alkenes
  作者：Maheshwara Reddy Nadiveedhi、Suresh Reddy Cirandur、Srirama Murthy Akondi

  DOI：10.1039/d0gc01726d

  日期：——

  Photocatalyst- and additive-free trifluoromethyl-thio(seleno)cyanation of alkenes using visible light as the sole promoter is reported.

  无需光催化剂和添加剂，利用可见光作为唯一的促进剂，报道了烯烃的三氟甲硫(硒)氰化反应。
• Visible‐Light‐Induced <i>ortho</i> ‐Selective Migration on Pyridyl Ring: Trifluoromethylative Pyridylation of Unactivated Alkenes
  作者：Jinwon Jeon、Yu‐Tao He、Sanghoon Shin、Sungwoo Hong

  DOI：10.1002/anie.201912746

  日期：2020.1.2

  alkenes. The overall process is initiated by the selective addition of a CF3 radical to the alkene to provide a nucleophilic alkyl radical intermediate, which enables an intramolecular endo addition exclusively to the ortho-position of the pyridinium salt. Both secondary and tertiary alkyl radicals are well-suited for addition to the C2-position of pyridinium salts to ultimately provide synthetically

  对于未活化的烯烃的位点选择性三氟甲基化吡啶基化，已经实现了在吡啶基环上的光催化邻位选择性迁移。整个过程是通过将CF3自由基选择性地添加到烯烃中以提供亲核烷基自由基中间体而启动的，该中间体能够将分子内的内含物专门添加到吡啶鎓盐的邻位。仲烷基和叔烷基都非常适合于添加吡啶鎓盐的C 2-位，以最终提供具有合成价值的C 2-氟烷基官能化的吡啶。此外，该方法已成功应用于以P为中心的自由基的反应。复杂生物活性分子的后期功能化进一步证明了这种转化的效用。
• Trifluoromethanesulfonyl azide as a bifunctional reagent for metal-free azidotrifluoromethylation of unactivated alkenes
  作者：Hong-Gui Huang、Weishuang Li、Dayou Zhong、Hu-Chong Wang、Jing Zhao、Wen-Bo Liu

  DOI：10.1039/d0sc06473d

  日期：——

  Vicinal trifluoromethyl azides have widespread applications in organic synthesis and drug development. However, their preparation is generally limited to transition-metal-catalyzed three-component reactions. We report here a simple and metal-free method that rapidly provides these building blocks from abundant alkenes and trifluoromethanesulfonyl azide (N3SO2CF3). This unprecedented two-component reaction

  邻位三氟甲基叠氮化物在有机合成和药物开发中具有广泛的应用。然而，它们的制备通常限于过渡金属催化的三组分反应。我们在这里报告了一种简单且无金属的方法，该方法可快速从丰富的烯烃和三氟甲磺酰叠氮化物（N 3 SO 2 CF 3）提供这些结构单元。这种前所未有的两组分反应采用了容易获得的N 3 SO 2 CF 3作为双功能试剂，可同时引入CF 3和N 3族避免使用它们昂贵且低原子的经济前体。宽泛的官能团，包括与生物有关的杂环和氨基酸，都可以耐受。该方法的应用通过放大合成（5 mmol），产物衍生化为含CF 3的药用化学图案以及天然产物和药物衍生物的后期修饰而得到进一步证明。