A New Class of S<sub>N</sub>2 Reactions Catalyzed by Protic Solvents: Facile Fluorination for Isotopic Labeling of Diagnostic Molecules
作者:Dong Wook Kim、Doo-Sik Ahn、Young-Ho Oh、Sungyul Lee、Hee Seup Kil、Seung Jun Oh、Sang Ju Lee、Jae Seung Kim、Jin Sook Ryu、Dae Hyuk Moon、Dae Yoon Chi
DOI:10.1021/ja0646895
日期:2006.12.1
Aprotic solvents are usually preferred for the SN2 reactions, because nucleophilicity and hence SN2 reactivity are severely retarded by the influence of the partial positive charge of protic solvents. In this work, we introduce a remarkable effect of using tertiary alcohols as a reaction medium for nucleophilic fluorination with alkali metal fluorides. In this novel synthetic method, the nonpolar protic
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。
Inhibition of Synaptosomal Accumulation of l‐Norepinephrine II: N‐aryloxyalkylphentermines, Quaternary d‐amphetamines, and 3‐aryloxypropylamines
作者:James C. Schaeffer、Arthur K. Cho、Joseph F. Fischer
DOI:10.1002/jps.2600650128
日期:1976.1
the synaptosomal uptake of l-norepinephrine were found to be similar to those of the corresponding amphetamines. Quaternization of N, N-dimenthyl-d-amphetamine diminished, but did not abolish, its inhibitory potency, indicating that a permanently charged cation is also effective. Since the addition of an aromatic moiety at the end of a four-atom chain originating at the nitrogen of amphetamine or phentermine
Nucleophilic fluorination using imidazolium based ionic liquid bearing tert-alcohol moiety
作者:Sandip S. Shinde、Sunil N. Patil、Amruta Ghatge、Pradeep Kumar
DOI:10.1039/c5nj00481k
日期:——
An ionicliquid bearing tert-butanol moiety ([mim-tOH][OMs]) was employed as an organocatalyst in the nucleophilicfluorination of a variety of substrates containing halogen/sulfonate as a leaving group. Low reactive metal fluorides, including KF, were used as a fluoride source in the reaction. Ionicliquid [mim-tOH][OMs] has shown excellent selectivity in nucleophilicfluorination of 2-(3-bromopropyloxy)naphthalene
Method for Preparing of Organofluoro Compounds in Alcohol Solvents
申请人:Moon Dae Hyuk
公开号:US20080171863A1
公开(公告)日:2008-07-17
The present invention relates to a method for preparation of organofluoro compounds containing radioactive isotope fluorine-18. More particularly, the present invention relates to a method for preparation of organofluoro compound by reacting fluorine salt containing radioactive isotope fluorine-18 with alkyl halide or alkyl sulfonate in the presence of alcohol of Chemistry (FIG.
1
) as a solvent to obtain high yield of organofluoro compound. Synthesis reaction according to the present invention may be carried out under mild condition to give high yield of the organofluoro compounds and the reaction time is decreased, and thereby is suitable for the mass production of the organofluoro compounds.