Thiourea‐Catalyzed C−F Bond Activation: Amination of Benzylic Fluorides
作者:Camille Houle、Paul R. Savoie、Clotilde Davies、Damien Jardel、Pier Alexandre Champagne、Brigitte Bibal、Jean‐François Paquin
DOI:10.1002/chem.202001905
日期:2020.8.17
thiourea catalyst and Ti(OiPr)4 as a fluoride scavenger allows the amination of benzylic fluorides to proceed in moderate to excellent yields. Preliminary results with S‐ and O‐based nucleophiles are also presented. DFT calculations reveal the importance of hydrogen bonds between the catalyst and the fluorineatom of the substrate to lower the activation energy during the transition state.
我们描述了第一个硫脲催化的CF键活化。使用硫脲催化剂和Ti(O i Pr)4作为氟化物清除剂可使苄基氟化物的胺化反应以中等至极好的收率进行。还介绍了基于S和O的亲核试剂的初步结果。DFT计算揭示了催化剂和底物氟原子之间氢键对于降低过渡态活化能的重要性。
Enabling Nucleophilic Substitution Reactions of Activated Alkyl Fluorides through Hydrogen Bonding
作者:Pier Alexandre Champagne、Julien Pomarole、Marie-Ève Thérien、Yasmine Benhassine、Samuel Beaulieu、Claude Y. Legault、Jean-François Paquin
DOI:10.1021/ol400765a
日期:2013.5.3
It was discovered that the presence of water as a cosolvent enables the reaction of activatedalkyl fluorides for bimolecular nucleophilic substitution reactions. DFT calculations show that activation proceeds through stabilization of the transition structure by a stronger F···H2O interaction and diminishing C–F bond elongation, and not simple transition state electrostatic stabilization. Overall,
hydrogen evolution ortho-aminoalkylation of phenolic derivatives with cyclic amines as the coupling agents. The developed cross-coupling reaction offers a practical platform for direct access to a variety of functionalized phenols with the features of good substrate and functional group compatibility, readily available catalyst system and feedstocks, no need for additional sacrificial oxidants, and high
Triol-promoted activation of C–F bonds: Amination of benzylic fluorides under highly concentrated conditions mediated by 1,1,1-tris(hydroxymethyl)propane
Activation of the C-F bond of benzylic fluorides was achieved using 1,1,1-tris(hydroxymethyl)propane (2) as a hydrogen bond-donating agent. Investigations demonstrated that hydrogen bond-donating solvents are promoting the activation and hydrogen bond-accepting ones are hindering it. However, the reaction is best run under highly concentrated conditions, where solvents cannot interfere with the interaction
Fluoroboron compound, aminomethylating agent for aromatic ring made of the same, and production method of compound containing aminomethyl aromatic ring using aminomethylating agent
申请人:Tanaka Keigo
公开号:US20080015351A1
公开(公告)日:2008-01-17
A production method of a compound containing a primary, secondary, or tertiary aminomethyl aromatic ring of the present invention includes: using a fluoroboron compound or a dimer thereof, or solvates thereof, which are represented by a formula (I):
Ra(Rb)N—CH
2
—BF
3
M (I)
as an aminomethylating agent for an aromatic ring; and reacting the aminomethylating agent with an aromatic ring-containing compound, which can react with the aminomethylating agent, under the presence of a metal catalyst such as a palladium compound so as to perform the direct aminomethylation of the aromatic ring.