Well-Defined, Shelf-Stable (NHC)Ag(CF2H) Complexes for Difluoromethylation
摘要:
The preparation of the thermally stable, well-defined NHC-ligated difluoromethylated silver complexes la,b is described. The complexes were fully characterized, and the structural assignments were ambiguously further confirmed by single-crystal X-ray diffraction. Reactions of [(SIPr)Ag(CF2H)] with a variety of activated electrophiles such as diaryliodonium salts, vinyl(aryl)iodonium salts, aryldiazonium salts, and acid chlorides in the presence or absence of CuI occurred smoothly at room temperature to generate difluoromethylated compounds in good to excellent yields.
An efficient and high yielding Cu-catalyzed direct CâH arylation of azaheterocycles including oxadiazoles, thiadiazoles, benzoxazoles and benzothiazoles has been achieved by employing easily accessible diaryliodonium salts.
Transition-Metal-Free Arylations of In-Situ Generated Sulfenates with Diaryliodonium Salts
作者:Hao Yu、Zhen Li、Carsten Bolm
DOI:10.1021/acs.orglett.8b03046
日期:2018.11.16
A transition-metal-free arylation of sulfenate anions generated from β-sulfinyl esters with diaryliodoniumsalts was developed. In this process, a new C–S bond is formed under mild reaction conditions providing a wide range of S,S-diaryl and S-alkyl S-aryl sulfoxides.
A modular method to synthesize acridinederivatives was developed with o-acylanilines and diaryliodoniumsalts. The reactions proceeded smoothly under Cu-catalyzed or metal-free reaction conditions at elevated temperature through tandemarylation/Friedel–Craftsreactions.
Copper-catalyzed arylation of polycyclic aromatic hydrocarbons by the PO group
作者:Yuan Niu、Zhichao Qi、Qinxin Lou、Pengbo Bai、Shangdong Yang
DOI:10.1039/d0cc06639g
日期:——
The first example of a directed and regioselective arylation of polycyclic aromatic hydrocarbons (PAHs) by using a PO directing group is reported herein. The protocol uses a cheap copper catalyst, and results in a breakthrough meta-selective C–H functionalization of arylphosphine oxide compounds. Substrates with potential fluorescence properties, for example, pyrene and fluoranthene, were successfully
Visible-light-mediated arylation of <i>ortho</i>-hydroxyarylenaminones: direct access to isoflavones
作者:Satenik Mkrtchyan、Viktor O. Iaroshenko
DOI:10.1039/c9cc09945j
日期:——
The first visible-light-promoted direct synthesis of isoflavones following the arylation of ortho-hydroxyarylenaminones by aryl onium salts was developed.