我们制备了pyr取代的咪唑基离子液体(PIL),作为使用碱金属氟化物(MF)进行S N 2氟化的有机催化剂。在该系统中,由于咪唑部分的相转移催化作用以及金属阳离子-π(py)相互作用,PIL显着提高了MF的反应性。此外,这种均相催化剂PIL易于通过还原石墨烯氧化物与PIL的π-π堆积而从反应混合物中分离出来。
Pyrene-Tagged Ionic Liquids: Separable Organic Catalysts for S<sub>N</sub>2 Fluorination
作者:Abu Taher、Kyo Chul Lee、Hye Ji Han、Dong Wook Kim
DOI:10.1021/acs.orglett.7b01064
日期:2017.7.7
as organic catalysts for the SN2 fluorination using alkalimetalfluoride (MF). In this system, the PIL significantly enhanced the reactivity of MF due to the phase-transfer catalytic effect of the imidazolium moiety as well as the metal cation−π (pyrene) interactions. Furthermore, this homogeneous catalyst PIL was easily separated from the reaction mixture using reduced graphene oxide by π–π stacking
我们制备了pyr取代的咪唑基离子液体(PIL),作为使用碱金属氟化物(MF)进行S N 2氟化的有机催化剂。在该系统中,由于咪唑部分的相转移催化作用以及金属阳离子-π(py)相互作用,PIL显着提高了MF的反应性。此外,这种均相催化剂PIL易于通过还原石墨烯氧化物与PIL的π-π堆积而从反应混合物中分离出来。
Bis-triethylene Glycolic Crown-5-calix[4]arene: A Promoter of Nucleophilic Fluorination Using Potassium Fluoride
作者:Seok Min Kang、Chul Hee Kim、Kyo Chul Lee、Dong Wook Kim
DOI:10.1021/acs.orglett.9b00649
日期:2019.5.3
a bis-triethylene glycolic crown-5-calix[4]arene (BTC5A) as a multifunctional promoter for nucleophilic fluorination using KF. The synergetic effect of the calix-crown moiety and ethylene glycols of BTC5A enabled KF to be easily dissolved in organic solvents and activated the fluoride in even nonpolar aprotic media. To validate its practicality, the SN2 fluorinations including 18F-fluorination of various
我们设计和合成了双三甘醇的Crown-5calix [4] arene(BTC5A)作为使用KF进行亲核氟化的多功能促进剂。BTC5A的杯冠部分和乙二醇的协同作用使KF易于溶解在有机溶剂中,甚至在非极性非质子介质中活化了氟化物。为了验证其实用性,在BTC5A存在下,使用KF(或[ 18 F] F –)成功地进行了S N 2氟化,包括各种底物的18 F氟化。
Facile nucleophilic fluorination by synergistic effect between polymer-supported ionic liquid catalyst and tert-alcohol reaction media system
作者:Dong Wook Kim、Hwan-Jeong Jeong、Seok Tae Lim、Myung-Hee Sohn、Dae Yoon Chi
DOI:10.1016/j.tet.2008.02.094
日期:2008.5
developed for nucleophilic fluorination using an alkali metal fluoride through the synergistic effect of the polymer-supportedionicliquid (PSIL) as a catalyst and tert-alcohol as an alternative reaction media. This PSIL/tert-alcohol system not only enhances the reactivity of alkali metal fluorides and reduces the formation of by-products but also allows the use of a polymer-supported catalyst protocol. As
Bis-<i>tert</i>
-Alcohol-Functionalized Crown-6-Calix[4]arene: An Organic Promoter for Nucleophilic Fluorination
作者:Vinod H. Jadhav、Wonsil Choi、Sung-Sik Lee、Sungyul Lee、Dong Wook Kim
DOI:10.1002/chem.201504602
日期:2016.3.18
The role of BACCA was revealed to be separation of the metalfluoride to a large distance (>8 Å), thereby producing an essentially “free” F−. The synergistic actions of the crown‐6‐calix[4]arene subunit (whose O atoms coordinate the counter‐cation Cs+) and the terminal tert‐alcohol OH groups (forming controlled hydrogen bonds with F−) of BACCA led to tremendous efficiency in SN2 fluorination of base‐sensitive
甲二-叔-醇官能冠-6-杯[4]芳烃(浆果)被设计并作为与亲核的CsF氟化反应的多官能有机启动子制备。通过形成CsF / BACCA复合物,BACCA可以释放出具有显着活性和选择性的氟化物源,用于S N 2氟化反应。通过量子化学方法研究了BACCA促进作用的起源。浆果的作用显露是金属氟化物分离到一个大的距离(> 8),从而产生基本上“自由” F - 。冠-6-杯的协同作用[4]芳烃亚基(其O原子坐标抗衡阳离子铯+)与终端叔-醇OH基团(形成有F控制氢键- )的浆果导致S中巨大效率Ñ 2氟化碱敏感的底物。
Polymer-Supported Ionic Liquids: Imidazolium Salts as Catalysts for Nucleophilic Substitution Reactions Including Fluorinations