Stereospecific Electrophilic Fluorination of Alkylcarbastannatrane Reagents
作者:Xinghua Ma、Mohamed Diane、Glenn Ralph、Christine Chen、Mark R. Biscoe
DOI:10.1002/anie.201704672
日期:2017.10.2
Speed matters: Site-specific fluorination reactions of isolable primary and secondary alkylcarbastannatrane nucleophiles occur fast, without the need for transition metal catalysis, or in situ activation of the nucleophile. The reaction conditions can also be extended to stereospecific chlorination, bromination, and iodination reactions.
Investigating the Influence of (Deoxy)fluorination on the Lipophilicity of Non-UV-Active Fluorinated Alkanols and Carbohydrates by a New log <i>P</i>
Determination Method
tuning by fluorination is very effective for a number of purposes, and currently increasingly investigated for aliphatic compounds. An important application is lipophilicity (logP) modulation. However, the determination of logP is cumbersome for non‐UV‐active compounds. A new variation of the shake‐flask logPdeterminationmethod is presented, enabling the measurement of logP for fluorinated compounds
Selective fluorination of alkyl C–H bonds <i>via</i> photocatalysis
作者:Choon Wee Kee、Kek Foo Chin、Ming Wah Wong、Choon-Hong Tan
DOI:10.1039/c4cc01848f
日期:——
We report the generation of cationic N-radicals from Selectfluor® via energy transfer with anthraquinone as a photocatalyst for the fluorination of unactivated C–H bonds.
Co-Catalyzed Hydrofluorination of Alkenes: Photocatalytic Method Development and Electroanalytical Mechanistic Investigation
作者:Jinjian Liu、Jian Rong、Devin P. Wood、Yi Wang、Steven H. Liang、Song Lin
DOI:10.1021/jacs.3c10989
日期:2024.2.21
represents an attractive strategy for the synthesis of aliphatic fluorides. This approach provides a direct means to form C(sp3)–F bonds selectively from readily available alkenes. Nonetheless, conducting hydrofluorination using nucleophilic fluorine sources poses significant challenges due to the low acidity and high toxicity associated with HF and the poor nucleophilicity of fluoride. In this study
烯烃的氢氟化代表了脂肪族氟化物合成的一种有吸引力的策略。这种方法提供了一种直接方法,可以从容易获得的烯烃中选择性地形成 C(sp 3 )–F 键。尽管如此,由于氟化物的低酸性和高毒性以及氟化物的差亲核性,使用亲核氟源进行氢氟化提出了重大挑战。在这项研究中,我们提出了一种新的 Co(salen) 催化简单烯烃的氢氟化反应,利用 Et 3 N·3HF 作为氢和氟的唯一来源。该过程通过光氧化还原介导的极性-自由基-极性交叉机制进行。我们还通过有效地将各种具有不同取代度的简单和活化烯烃转化为氢氟化产品,证明了该方法的多功能性。此外,我们成功地将这种方法应用于18 F-氢氟化反应,从而能够将18 F 引入潜在的放射性药物中。我们使用旋转盘电极伏安法和 DFT 计算进行的机理研究揭示了碳阳离子和 Co IV烷基物种作为氟化步骤中可行的中间体的参与,并且每个途径的贡献取决于起始烯烃的结构。
Electrochemical C(sp3)–H Fluorination
作者:Yusuke Takahira、Miao Chen、Yu Kawamata、Pavel Mykhailiuk、Hugh Nakamura、Byron K. Peters、Solomon H. Reisberg、Chao Li、Longrui Chen、Tamaki Hoshikawa、Tomoyuki Shibuguchi、Phil S. Baran
DOI:10.1055/s-0037-1611737
日期:2019.6
A simple and robust method for electrochemical alkyl C–H fluorination is presented. Using a simple nitrate additive, a widely available fluorine source (Selectfluor), and carbon-based electrodes, a wide variety of activated and unactivated C–H bonds are converted into their C–F congeners. The scalability of the reaction is also demonstrated with a 100 gram preparation of fluorovaline.