许多三氟甲氧基化方法经常提出亲核 AgOCF 3作为关键中间体。然而,这种中间体的结构仍然难以捉摸。在此,制备了热稳定、光不敏感的亲核三氟甲氧基化试剂[Ag(PPh t Bu 2 )(OCF 3 )] ( 1 )并进行了充分表征。试剂1与多种烷基亲电子试剂反应,包括苄基溴/氯化物、伯烷基溴/碘化物/三氟甲磺酸酯/对硝基苯磺酸酯和仲烷基溴化物/三氟甲磺酸酯/对硝基苯磺酸酯,产率良好至优异。通过与三种对映体富集的二级烷基亲电子试剂反应进行的机理研究表明,这些反应通过 S N 2 途径进行,这与我们最初的机理假设一致。
Trifluoromethyl ethers R-OCF3 are easily synthesized from the corresponding dithiocarbonates R-OCS2Me (R = aryl or primary alkyl) by a reagent system consisting of 70% HF/pyridine and an N-halo imide. When the reaction is applied to R-OCS2Me wherein R = secondary alkyl, tertiary alkyl, or benzylic group, fluorination leading to the corresponding alkyl fluorides R-F is achieved, whereas a combination
Chemoselective desulfurization-fluorination/bromination of carbonofluoridothioates for the O-trifluoromethylation and O-bromodifluoromethylation of alcohols
作者:Jie Liu、Haonan Xiang、Lvqi Jiang、Wenbin Yi
DOI:10.1007/s11426-021-1028-6
日期:2021.8
trifluoromethyl and alkyl bromodifluoromethyl ethers using carbonofluoridothioates (R-OC(=S)F) as precursors has been described. Carbonofluoridothioates were obtained upon the reaction of an alcohol and S=CF2 generated via the decomposition of an SCF3 anion, and then selectively transformed into their corresponding trifluoromethyl and bromodifluoromethyl ethers upon changing the reaction conditions. This
A Facile Synthesis of Novel Liquid Crystalline Materials Having a Trifluoromethoxy Group and Their Electro-Optical Properties
作者:Kiyoshi Kanie、Sadao Takehara、Tamejiro Hiyama
DOI:10.1246/bcsj.73.1875
日期:2000.8
Novel liquid crystals (LCs) containing a trifluoromethoxy group connected to a cyclohexane mesogen or to an alkyl tail were prepared through an oxidative desulfurization-fluorination reaction of the corresponding dithiocarbonates. They were compared with LCs containing a methoxy group with respect to phase transition behavior and physical and electro-optical properties. Most of the CF3O-substituted LCs exhibited in a wide range of temperatures LC phases depending on the type of a mesogenic structure. LCs with a trifluoromethoxycyclohexane mesogen were shown to be thermally more stable than the LCs with a trifluoromethoxybenzene mesogen. LCs having a trifluoromethoxyalkyl tail show physical and electro-optical properties favorable to materials for not only TN-LCDs but TFT-addressed TN-LCDs. Furthermore, 3-β-CF3O-substituted cholestane was shown to be a potential chiral dopant for TFT-addressed TN-LCDs.
[EN] COMPOUNDS AND COMPOSITIONS FOR TREATING CONDITIONS ASSOCIATED WITH STING ACTIVITY<br/>[FR] COMPOSÉS ET COMPOSITIONS POUR TRAITER DES ÉTATS PATHOLOGIQUES ASSOCIÉS À UNE ACTIVITÉ DE STING
申请人:IFM DUE INC
公开号:WO2022015977A1
公开(公告)日:2022-01-20
This disclosure features chemical entities (e.g., a compound or a pharmaceutically acceptable salt, and/or hydrate, and/or cocrystal, and/or drug combination of the compound) that inhibit (e.g., antagonize) Stimulator of Interferon Genes (STING). Said chemical entities are useful, e.g., for treating a condition, disease or disorder in which increased (e.g., excessive) STING activation (e.g., STING signaling) contributes to the pathology and/or symptoms and/or progression of the condition, disease or disorder (e.g., cancer) in a subject (e.g., a human). This disclosure also features compositions containing the same as well as methods of using and making the same.