A New Method for Aromatic Difluoromethylation: Copper-Catalyzed Cross-Coupling and Decarboxylation Sequence from Aryl Iodides
摘要:
A new methodology for aromatic difluoromethylation is described. Aryl iodides reacted with alpha-silyldifluoroacetates upon treatment with copper catalyst in DMSO or DME to give the corresponding aryldifluoroacetates in moderate to good yields. The subsequent hydrolysis of aryldifluoroacetates and KF-promoted decarboxylation afforded a variety of difluoromethyl aromatics.
18
F‐Labeling of Aryl‐SCF
3
, ‐OCF
3
and ‐OCHF
2
with [
18
F]Fluoride
摘要:
AbstractWe report that halogenophilic silver(I) triflate permits halogen exchange (halex) nucleophilic 18F‐fluorination of aryl‐OCHFCl, ‐OCF2Br and ‐SCF2Br precursors under mild conditions. This AgI‐mediated process allows for the first time access to a range of 18F‐labeled aryl‐OCHF2, ‐OCF3 and ‐SCF3 derivatives, inclusive of [18F]riluzole. The 18F‐labeling of these medicinally important motifs expands the radiochemical space available for PET applications.
Synthesis of Difluoroalkylated Arenes by Hydroaryldifluoromethylation of Alkenes with α,α-Difluoroarylacetic Acids under Photoredox Catalysis
作者:Bin Yang、Xiu-Hua Xu、Feng-Ling Qing
DOI:10.1021/acs.orglett.6b03092
日期:2016.11.18
A visble-light-induced hydroaryldifluoromethylation of alkenes with α,α-difluoroarylacetic acids for preparation of difluoroalkylated arenes has been developed. This reaction proceeds through the hypervalent iodine reagent promoted decarboxylation and subsequent radical hydroaryldifluoromethylation.
Generation of Axially Chiral Fluoroallenes through a Copper-Catalyzed Enantioselective β-Fluoride Elimination
作者:Thomas J. O’Connor、Binh Khanh Mai、Jordan Nafie、Peng Liu、F. Dean Toste
DOI:10.1021/jacs.1c05769
日期:2021.9.1
difluorides to generate axiallychiral, tetrasubstituted monofluoroallenes in both good yields (27 examples >80%) and enantioselectivities (82–98% ee). Compared to previously reported synthetic routes to axiallychiralallenes (ACAs) from prochiral substrates, a mechanistically distinct reaction has been developed: the enantiodiscrimination between enantiotopic fluorides to set an axial stereocenter. DFT
METHOD FOR PRODUCING AROMATIC DIFLUOROACETIC ACID ESTER
申请人:Amii Hideki
公开号:US20120220795A1
公开(公告)日:2012-08-30
Disclosed is a method for producing a compound having a difluoromethylene group at an even lower cost and with excellent yield. The production method of the present invention is a method for producing an aromatic difluoroacetic acid ester, which comprises reacting an iodobenzene containing an electro attracting group and an α-silyl difluoroacetic acid ester in the presence of a metal halide.
Easy Access to Difluoromethylene-Containing Arene Analogues through Palladium-Catalysed C-H Olefination
作者:Changdong Shao、Guangfa Shi、Yanghui Zhang
DOI:10.1002/ejoc.201600954
日期:2016.11
An efficient palladium-catalyzed ortho C−H olefination of α,α-difluorophenylacetic acidderivatives using 8-aminoquinoline as the bidentate directing group has been developed. A range of olefinated arenes can be synthesized in a concise way. This reaction provides an easy and straightforward access to a panel of difluoromethylated arene analogues in moderate to good yields with a satisfactory tolerance
Provided herein are novel ligands and pharmaceutical compositions thereof which modulate IL-17A. Also provided are methods for preparing the IL-17A modulators. Such compounds may be useful in the treatment and/or prevention of, for example, inflammation, cancer or autoimmune disease.