444-29-1Relevant academic research and scientific papers
METHOD OF MANUFACTURING BIS(TRIFLUOROMEHTYL)BIPHENYL COMPOUND
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Paragraph 0076-0078, (2021/09/21)
A process for preparing a bis biphenyl compound according to example embodiments of the present invention is reacting a triflouromethylaniline compound with an alkali metal halide to form a halotrifluoride methylbenzene compound. The halotriflouromethylbenzene compound is subjected to coupling reaction under copper catalyst conditions. The productivity of bis biphenyl compounds can be improved.
Lipshutz-type bis(amido)argentates for directed: Ortho argentation
Tezuka, Noriyuki,Hirano, Keiichi,Peel, Andrew J.,Wheatley, Andrew E. H.,Miyamoto, Kazunori,Uchiyama, Masanobu
, p. 1855 - 1861 (2020/03/03)
Bis(amido)argentate (TMP)2Ag(CN)Li2 (3, TMP-Ag-ate; TMP = 2,2,6,6-tetramethylpiperidido) was designed as a tool for chemoselective aromatic functionalization via unprecedented directed ortho argentation (DoAg). X-Ray crystallographic analysis showed that 3 takes a structure analogous to that of the corresponding Lipshutz cuprate. DoAg with this TMP-Ag-ate afforded multifunctional aromatics in high yields in processes that exhibited high chemoselectivity and compatibility with a wide range of functional groups. These included organometallics- A nd transition metal-susceptible substituents such as methyl ester, aldehyde, vinyl, iodo, (trifluoromethanesulfonyl)oxy and nitro groups. The arylargentates displayed good reactivity with various electrophiles. Chalcogen (S, Se, and Te) installation and azo coupling reactions also proceeded efficiently.
Cathodic C-H Trifluoromethylation of Arenes and Heteroarenes Enabled by an in Situ-Generated Triflyltriethylammonium Complex
Cantillo, David,Jud, Wolfgang,Kappe, C. Oliver,Maljuric, Snjezana
supporting information, (2019/10/08)
While several trifluoromethylation reactions involving the electrochemical generation of CF3 radicals via anodic oxidation have been reported, the alternative cathodic, reductive radical generation has remained elusive. Herein, the first cathodic trifluoromethylation of arenes and heteroarenes is reported. The method is based on the electrochemical reduction of an unstable triflyltriethylammonium complex generated in situ from inexpensive triflyl chloride and triethylamine, which produces CF3 radicals that are trapped by the arenes on the cathode surface.
The ortho-Difluoroalkylation of Aryliodanes with Enol Silyl Ethers: Rearrangement Enabled by a Fluorine Effect
Huang, Xin,Zhang, Yage,Zhang, Chaoshen,Zhang, Lei,Xu, Ying,Kong, Lichun,Wang, Zhi-Xiang,Peng, Bo
, p. 5956 - 5961 (2019/04/03)
Presented herein is an intriguing effect of fluorine, and it allows difluoroenol silyl ethers to couple with aryliodanes in a redox-neutral manner to afford ortho-iodo difluoroalkylated arenes. The remaining iodide group provides a versatile platform for converting the products into various valuable difluoroalkylated arenes. The reaction shows excellent functional-group compatibility and broad substrate scope. A DFT mechanistic study suggests that the fluorine effect facilitates a subtle nucleophilic attack of the oxygen atom of enol silyl ethers onto aryliodanes, therefore leading to a rearrangement.
Aryl iodine compound containing carboxydifluoromethylene at ortho-position and preparation method thereof
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Paragraph 0107; 0108; 0109, (2019/06/30)
The invention discloses a preparation method of an aryl iodine compound containing carboxydifluoromethylene at ortho-position. The preparation method is characterized by including: at the presence oftrimethylsilyl trifluoromethanesulfonate, allowing aryl iodine diacetate shown as a structural formula (I) and pentafluoroacetone enol silicon ether shown as a structural formula (II) to be in rearrangement reaction, and hydrolyzing under strong base to obtain the aryl iodine compound containing methylene difluoroacetate and shown as a structural formula (III), wherein R1 is selected from hydrogen, halogen, alkyl, alkoxy, carbalkoxy, halogenated alkyl, halogenated alkoxy, carbalkoxy substituted alkyl, amino substituted alkyl, carbalkoxy and amino substituted alkyl, cyano or nitro, and Ar is selected from benzene ring, naphthalene ring and thiophene ring. The preparation method has the advantages of being mild in reaction condition, high in selectivity and yield, easy-to-separate in productand simple in operation.
Silver-Mediated Trifluoromethylthiolation-Iodination of Arynes
Zeng, Yuwen,Hu, Jinbo
supporting information, p. 856 - 859 (2016/03/04)
(Chemical Equation Presented). A one-pot trifluoromethylthiolation-iodination of arynes with trifluoromethylthiosilver (AgSCF3) and 1-iodophenylacetylene is described. This protocol allows rapid construction of o-trifluoromethylthiolated arene building blocks in moderate yields. These products were found to be excellent precursors for Yagupolskii-Umemoto-type electrophilic trifluoromethylation reagents.
Using Anilines as Masked Cross-Coupling Partners: Design of a Telescoped Three-Step Flow Diazotization, Iododediazotization, Cross-Coupling Process
Teci, Matthieu,Tilley, Michael,McGuire, Michael A.,Organ, Michael G.
supporting information, p. 17407 - 17415 (2016/11/23)
The conversion of commercially available anilines into biaryl and biarylacetylene products was realized by using a telescoped, three-reactor flow diazotization/iododediazotization/cross-coupling process. The segmented flow stream created by off-gassing during the Sandmeyer sequence was restored to a continuous column of reaction solution by using a specially designed continuous-flow unit controlled by custom software created in-house. The resultant aryl iodide was then combined with a stream of cross-coupling solution that fed into the final reactor. The system proved versatile as modifications to the diazotization/iododediazotization sequence could be made rapidly to account for any substrate specificity (e.g., solubility problems), leading to a wide substrate scope of Suzuki–Miyaura and Sonogashira cross-coupled products.
Study on the degradation of the highly reactive hypervalent trifluoromethylation iodine reagent PhI(OAc)(CF3)
Zhu, Hui,Zhang, Shusheng,Wang, Haoyang,Xu, Bin,Guo, Yinlong
supporting information, p. 1365 - 1370 (2016/02/18)
Degradation of the highly reactive hypervalent trifluoromethylation iodine reagent PhI(OAc)(CF3), which can only be generated in situ with mixing PhI(OAc)2 and TMSCF3 in the presence of CsF, was studied by ESI-MS and GC-MS combined with 19F-NMR. The important transient intermediate PhICF3+ was determined by ESI-MS, and the major volatile products containing CF3 were identified with the authentic compounds by using GC-MS, such as trifluoromethylbenzene, 2-iodobenzotrifluoride, 3-iodobenzotrifluoride, 4-iodobenzotrifluoride. Meanwhile, more evidences obtained with 19F-NMR were given for such degradation reaction. A possible rapid CF3 radical transfer reaction pathway was proposed to clarify such degradation progress based on the experimental results. Therefore, this study may be helpful in elucidating the intrinsic reactivity of PhI(OAc)(CF3) and the possible competing side reactions caused by such self-degradation pathway. Degradation of the highly reactive hypervalent trifluoromethylation iodine reagent PhI(OAc)(CF3), which can only be generated in situ with mixing PhI(OAc)2 and TMSCF3 in the presence of CsF, was studied by ESI-MS and GC-MS combined with 19F-NMR. The important transient intermediate PhICF3+ was determined by ESI-MS, and the major volatile products containing CF3 were identified with the authentic compounds by using GC-MS, such as trifluoromethylbenzene, 2-iodobenzotrifluoride, 3-iodobenzotrifluoride, 4-iodobenzotrifluoride. Meanwhile, more evidences obtained with 19F-NMR were given for such degradation reaction. A possible rapid CF3 radical transfer reaction pathway was proposed to clarify such degradation progress based on the experimental results. Therefore, this study may be helpful in elucidating the intrinsic reactivity of PhI(OAc)(CF3) and the possible competing side reactions caused by such self-degradation pathway.
Silver-Catalyzed C-H Trifluoromethylation of Arenes Using Trifluoroacetic Acid as the Trifluoromethylating Reagent
Shi, Guangfa,Shao, Changdong,Pan, Shulei,Yu, Jingxun,Zhang, Yanghui
supporting information, p. 38 - 41 (2015/07/28)
Direct trifluoromethylation of arenes using TFA as the trifluoromethylating reagent was achieved with Ag as the catalyst. This reaction not only provides a new protocol for aryl C-H trifluoromethylation, but the generation of CF3· from TFA may prove useful in other contexts and could potentially be extended to other trifluoromethylation reactions. (Chemical Equation Presented).
Potassium-alkyl magnesiates: Synthesis, structures and Mg-H exchange applications of aromatic and heterocyclic substrates
Baillie, Sharon E.,Bluemke, Tobias D.,Clegg, William,Kennedy, Alan R.,Klett, Jan,Russo, Luca,De Tullio, Marco,Hevia, Eva
supporting information, p. 12859 - 12862 (2014/12/11)
Using structurally well-defined dipotassium-tetra(alkyl)magnesiates, a new straightforward methodology to promote regioselective Mg-H exchange reactions of a wide range of aromatic and heteroaromatic substrates is disclosed. Contacted ion pair intermediates are likely to be involved, with K being the key to facilitate the magnesiation processes. This journal is
