Dehydrobromination of some substituted phenyl 3-bromopropionates and phenyl 3-bromothiolopropionates. Transmission of activation effects through acyl bonds
Efficient Cu-catalyzed Atom Transfer Radical Addition Reactions of Fluoroalkylsulfonyl Chlorides with Electron-deficient Alkenes Induced by Visible Light
作者:Xiao-Jun Tang、William R. Dolbier
DOI:10.1002/anie.201412199
日期:2015.3.27
Fluoroalkylsulfonyl chlorides, RfSO2Cl, in which Rf=CF3, C4F9, CF2H, CH2F, and CH2CF3, are used as a source of fluorinated radicals to add fluoroalkyl groups to electron‐deficient, unsaturated carbonyl compounds. Photochemical conditions, using Cu mediation, are used to produce the respective α‐chloro‐β‐fluoroalkylcarbonyl products in excellent yields through an atom transferradicaladdition (ATRA) process
氟烷基磺酰氯,R f SO 2 Cl,其中R f= CF 3,C 4 F 9,CF 2 H,CH 2 F和CH 2 CF 3,被用作氟自由基的来源以向电子中添加氟烷基。不足的不饱和羰基化合物。通过铜介导的光化学条件,可通过原子转移自由基加成(ATRA)工艺以优异的产率生产相应的α-氯-β-氟代烷基羰基产物。α-氯取代基的容易亲核取代会导致产物进一步多样化的功能。
[EN] FORCE-RESPONSIVE POLYMERSOMES AND NANOREACTORS; PROCESSES UTILIZING THE SAME<br/>[FR] POLYMERSOMES ET NANORÉACTEURS SENSIBLES À LA FORCE; PROCÉDÉS LES UTILISANT
申请人:ADOLPHE MERKLE INSTITUTE UNIV OF FRIBOURG
公开号:WO2019034597A1
公开(公告)日:2019-02-21
The mechanically induced melting properties of DNA were employed to achieve force labile membranes is described. Nucleobase pairs were used as mechanophores. Adenine and thymine functionalized complementary amphiphilic block copolymers were self-assembled into polymersomes. The nucleobases formed hydrogen bonds which were disrupted upon force stimulation. The exposure of the disconnected nucleobases to the hydrophobic matrix of the membranes lead to a change of permeability which permitted the exchange of water-soluble molecules throughout the polymer matrix. Moreover, the encapsulation of horseradish peroxidase enabled the reaction of luminol with hydrogen peroxide to yield a luminescence producing species similar to the marine bioluminescence. Moreover, the same nano-reactors were employed to catalyze the formation of a polyacrylamide gel when force was applied. Insights into the change of permeability of supramolecular networks upon force are provided. These systems are useful for drug delivery, as nanoreactors and for the selective release of curing agents for 3D printing, or fragrances.
Direct Photoredox‐Catalyzed Reductive Difluoromethylation of Electron‐Deficient Alkenes
作者:Xiao‐Jun Tang、Zuxiao Zhang、William R. Dolbier
DOI:10.1002/chem.201504363
日期:2015.12.21
Photoredox‐catalyzed reductivedifluoromethylation of electron‐deficient alkenes was achieved in one step under tin‐free, mild and neutral conditions. This protocol affords a facile method to introduce RCF2 (R=H, Ph, Me, and CH2N3) groups at sites β to electron‐withdrawing groups. It was found that TTMS (tris(trimethylsilyl)silane) served nicely as both the H‐atom donor and the electron donor in the
在缺锡,温和和中性的条件下,一步一步就可以完成缺氧烯烃的光氧化还原催化的还原性二氟甲基化反应。该方案提供了一种简便的方法,可将β位的RCF 2(R = H,Ph,Me和CH 2 N 3)基团引入吸电子基团。发现TTMS(三(三甲基甲硅烷基)硅烷)在催化循环中既可以作为氢原子供体,也可以作为电子供体。实验和DFT计算结果提供了RCF 2(R = H,Ph,Me)自由基本质上亲核的证据。
Enantioselective Pallada‐Electrocatalyzed C−H Activation by Transient Directing Groups: Expedient Access to Helicenes
作者:Uttam Dhawa、Cong Tian、Tomasz Wdowik、João C. A. Oliveira、Jiping Hao、Lutz Ackermann
DOI:10.1002/anie.202003826
日期:2020.8.3
Asymmetric pallada‐electrocatalyzed C−H olefinations were achieved through the synergistic cooperation with transient directing groups. The electrochemical, atroposelective C−H activations were realized with high position‐, diastereo‐, and enantio‐control under mild reaction conditions to obtain highly enantiomerically‐enriched biaryls and fluorinated N−C axiallychiral scaffolds. Our strategy provided
Generation and reaction of alkyl radicals in open reaction vessels
作者:Elene Tatunashvili、Christopher S. P. McErlean
DOI:10.1039/d0ob01892a
日期:——
alkyl iodides into reactive alkyl radicals is described. Aryl diazonium salts react with Hantzsch esters and molecular oxygen to give aryl radicals, which participate in halogen atom transfers to give alkyl radicals. These intermediates react with a variety of acceptors. The reaction cascade occurs at room temperature, in open reaction vessels, with short reaction times.