Copper-catalyzed aerobic oxyarylation of [1,2,3]triazolo[1,5-a]pyridines is developed. Notably molecular oxygen was utilized as one of the reagents and the transformation resulted in the formation of novel pyridinium triazolinone ylides. A basic mechanism for the one-pot process is proposed and further functionalization of the ylidic products were also presented.
Enantioselective Copper-Catalyzed Arylation-Driven Semipinacol Rearrangement of Tertiary Allylic Alcohols with Diaryliodonium Salts
作者:Daniel H. Lukamto、Matthew J. Gaunt
DOI:10.1021/jacs.7b05340
日期:2017.7.12
A copper-catalyzed enantioselective arylative semipinacol rearrangement of allylic alcohols using diaryliodonium salts is reported. Chiral Cu(II)-bisoxazoline catalysts initiate an electrophilic alkene arylation, triggering a 1,2-alkyl migration to afford a range of nonracemic spirocyclic ketones with high yields, diastereo- and enantioselectivities.
Metal-free Synthesis of Aryl Amines: Beyond Nucleophilic Aromatic Substitution
作者:Alexander H. Sandtorv、David R. Stuart
DOI:10.1002/anie.201610086
日期:2016.12.19
salt electrophiles and secondary aliphatic amine nucleophiles. This reaction results in direct ipso‐substitution of the iodonium moiety and unsymmetrical aryl(TMP)iodonium salts are primarily employed. Moreover, arene substituents and substitution patterns that currently pose a challenge to classical metal‐free methods are accommodated and the alicyclic amine nucleophiles used here are unprecedented
func(tionalization): An efficient and practical protocol for the CH ortho arylation of benzoicacids with diaryliodonium salts by using water as an environmentally benign, nontoxic reaction medium is developed. The choice of water as the solvent is crucial for this reaction, which sets the stage for the broad application of aqueous conditions in CH functionalization reactions.
Arylation, Vinylation, and Alkynylation of Electron-Deficient (Hetero)arenes Using Iodonium Salts
作者:Chuan Liu、Qiu Wang
DOI:10.1021/acs.orglett.6b02550
日期:2016.10.7
Arylation, vinylation, and alkynylation of electron-deficient arenes and heteroarenes have been achieved by chemoselective C–H zincation followed by copper-catalyzed coupling reactions using iodoniumsalts. This approach offers a direct and general access to a wide scope of (hetero)biaryls as well as alkenylated and alkynylated heteroarenes under mild conditions. It is particularly useful and valuable