16473-20-4Relevant academic research and scientific papers
Visible-light photoredox-catalyzed selective carboxylation of C(sp3)?F bonds with CO2
Bo, Zhi-Yu,Chen, Lin,Gao, Tian-Yu,Jing, Ke,Lan, Yu,Liu, Shi-Han,Luo, Shu-Ping,Yan, Si-Shun,Yu, Bo,Yu, Da-Gang
supporting information, p. 3099 - 3113 (2021/11/16)
It is highly attractive and challenging to utilize carbon dioxide (CO2), because of its inertness, as a nontoxic and sustainable C1 source in the synthesis of valuable compounds. Here, we report a novel selective carboxylation of C(sp3)?F bonds with CO2 via visible-light photoredox catalysis. A variety of mono-, di-, and trifluoroalkylarenes as well as α,α-difluorocarboxylic esters and amides undergo such reactions to give important aryl acetic acids and α-fluorocarboxylic acids, including several drugs and analogs, under mild conditions. Notably, mechanistic studies and DFT calculations demonstrate the dual role of CO2 as an electron carrier and electrophile during this transformation. The fluorinated substrates would undergo single-electron reduction by electron-rich CO2 radical anions, which are generated in situ from CO2 via sequential hydride-transfer reduction and hydrogen-atom-transfer processes. We anticipate our finding to be a starting point for more challenging CO2 utilization with inert substrates, including lignin and other biomass.
A Series of Deoxyfluorination Reagents Featuring OCF2Functional Groups
Cao, Wei,Chen, Qing-Yun,Guo, Yong,Su, Zhaoben,Wu, Chengying,Zhao, Shiyu
supporting information, (2020/11/03)
Research on perfluoroalkyl ether carboxylic acids (PFECAs) as alternatives for perfluoroalkyl substances continues with the goal of protecting the environment. However, very little is known about the utilization of decomposition products of PFECAs. We report herein a new series of deoxyfluorination reagents featuring OCF2 functional groups derived from certain PFECAs. Alkyl fluorides were generated from various alcohols in ≤97% yield by these novel reagents. The mechanistic experiment verified in situ generation of carbonic difluoride (COF2).
Fluorination reagent and deoxygenation fluorination method
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Paragraph 0066-0116; 0127-0138; 0155-0156, (2020/12/30)
In order to overcome the problems of high cost and poor stability of the existing deoxidation fluorination reagent, the invention provides a fluorination reagent. The fluorination reagent comprises acation M and an anion, and the anion is selected from one or more of the following perfluoropolyether chain carboxylic acid anions: CF3 (OCF2) nCO2, and n is selected from 1-10. Meanwhile, the invention further discloses a deoxidation fluorination method. The fluorination reagent provided by the invention has the advantages that the materials are easy to obtain, the fluorination products can beobtained at higher yield for various alcohol substrates, and the universality for different alcohol substrates is better.
Cobalt-Catalyzed Asymmetric Cross-Coupling Reaction of Fluorinated Secondary Benzyl Bromides with Lithium Aryl Boronates/ZnBr2
Huang, Weichen,Shen, Qilong,Wan, Xiaolong
supporting information, p. 4327 - 4332 (2020/06/27)
A cobalt-catalyzed asymmetric cross-coupling of α-bromo-α-fluorotoluene derivatives with a variety of aryl zincates derived from lithium aryl n-butyl pinacol boronates and ZnBr2 under mild reaction conditions was described. In addition to mild reaction conditions, another advantage includes the compatibility of various common functional groups such as fluoride, chloride, bromide, cyano, or ester groups. Furthermore, this protocol was successfully applied to the enantioselective synthesis of three fluorinated derivatives of biologically active compounds or drug molecules.
Monofluoroalkyl-containing compound and its preparation method and use
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Paragraph 0088; 0089; 0090, (2017/07/31)
The invention discloses a monofluoroalkyl-containing compound and its preparation method. The preparation method comprises that in a solvent, in the presence of an alkali, an additive, a ligand and a catalyst, a compound A and a compound B undergo a suzuk
Denitrogenative hydrofluorination of aromatic aldehyde hydrazones using (difluoroiodo)toluene
Kulkarni, Kaivalya G.,Miokovic, Boris,Sauder, Matthew,Murphy, Graham K.
, p. 9907 - 9911 (2016/10/31)
An operationally simple conversion of aromatic aldehyde hydrazones to monofluoromethylated arenes is reported. The hypervalent iodine reagent TolIF2 serves as an oxidant, converting the hydrazone to the corresponding diazo compounds. The by-product of the oxidation process, HF, is consumed in situ by a denitrogenative hydrofluorination reaction of the diazo group.
4-(3-CYANOPHENYL)-6-PYRIDINYLPYRIMIDINE MGLU5 MODULATORS
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Page/Page column 41, (2015/02/02)
The disclosures herein relate to novel compounds of formula wherein R1, R2, R3 and R4 and n are defined herein, and their use in treating, preventing, ameliorating, controlling or reducing the risk of inflammati
Facile Access to Fluoromethylated Arenes by Nickel-Catalyzed Cross-Coupling between Arylboronic Acids and Fluoromethyl Bromide
An, Lun,Xiao, Yu-Lan,Min, Qiao-Qiao,Zhang, Xingang
supporting information, p. 9079 - 9083 (2015/08/03)
The nickel-catalyzed fluoromethylation of arylboronic acids was achieved with the industrial raw material fluoromethyl bromide (CH2FBr) as the coupling partner. The reaction proceeded under mild reaction conditions with high efficiency; it features the use of a low-cost nickel catalyst, synthetic simplicity, and excellent functional-group compatibility, and provides facile access to fluoromethylated biologically relevant molecules. Preliminary mechanistic studies showed that a single-electron-transfer (SET) pathway is involved in the catalytic cycle.
Phenylglycinamide and pyridylglycinamide derivatives useful as anticoagulants
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Page/Page column 87-88, (2010/11/25)
The present invention provides novel phenylglycinamide derivatives of Formula (I) or (IV): or a stereoisomer, tautomer, pharmaceutically acceptable salt, solvate, or prodrug thereof, wherein the variables W, W1, Y, Z, R7, R8, R9, and R11 are as defined herein. These compounds are selective inhibitors of factor VIIa which can be used as medicaments.
Selective electrolytic fluorinations in 70% HF/30% pyridine
Lee, Sarah M.,Roseman, Jamie M.,Zartman, C. Blair,Morrison, Eamonn P.,Harrison, Sean J.,Stankiewicz, Corrie A.,Middleton
, p. 65 - 70 (2007/10/03)
The selective fluorination of compounds containing benzylic hydrogen atoms was accomplished by electrolysis in a mixture of 70% HF and 30% pyridine (Olah's reagent) using a square wave alternating current (1.76-2.75 V, 0.02-0.05 Hz) and Pt electrodes. This method can be used in the laboratory to prepare conveniently gram-size quantities of monofluorinated products. An ion radical mechanism has been proposed.
