The reaction of aromatic acetyl derivatives with potassium iodide and potassium iodate in acetic acid in the presence of sulfuric acid at room temperature gave iodoacethyl derivatives in good yields.
Three-component access to pyrroles promoted by the CAN–silver nitrate system under high-speed vibration milling conditions: a generalization of the Hantzsch pyrrole synthesis
作者:Verónica Estévez、Mercedes Villacampa、J. Carlos Menéndez
DOI:10.1039/c2cc38099d
日期:——
A sequential multicomponent process involving the high-speed vibration milling of ketones with N-iodosuccinimide and p-toluenesulfonic acid, followed by addition of a mixture of primary amines, β-dicarbonyl compounds, cerium(IV) ammonium nitrate and silver nitrate afforded polysubstituted, functionalized pyrroles. This one-pot, solid-state process can be considered as the coupling of an α-iodoketone preparation with a general version of the classical Hantzsch pyrrole synthesis.
Copper‐Catalyzed Enantioselective Cyano(Fluoro)Alkylation of Alkenes
作者:Muhammad Israr、Haigen Xiong、Yajun Li、Hongli Bao
DOI:10.1002/adsc.202000230
日期:2020.5.26
A copper‐catalyzed asymmetric cyano(fluoro)alkylation reaction of alkenes is reported. A range of chiral fluoroalkyl cyanides were obtained in high yields and excellent enantiomeric excess from readily available chemicals. The method uses fluoroalkyl iodides as the fluoroalkyl source and employs mild conditions. The peroxide LPO plays a significant role in promotion of this radical asymmetric reaction
Regioselective C−H Functionalization of Heteroarene
<i>N</i>
‐Oxides Enabled by a Traceless Nucleophile
作者:Gangadhar Rao Mathi、Byeongseok Kweon、Yonghoon Moon、Yujin Jeong、Sungwoo Hong
DOI:10.1002/anie.202010597
日期:2020.12.7
simultaneous C8‐functionalization of quinolines at room temperature. Experimental and computational studies support the traceless operation of a nucleophile, which enables the previously inaccessible transformation of N‐alkenoxyheteroarenium salts. Remarkably, the generality of this strategy has been further demonstrated by broad applications in the regioselectiveC−Hfunctionalization of other electron‐deficient
N-heterocyclic carbenes (NHCs) are well-known as ligands and organocatalysts, but there is no recognition for their catalytic role as a stabilizer through electrostatic interaction rather than electron donation. By utilizing the electrostatic interaction, we herein describe the success of a visible-light-triggered radical–radical cross-coupling of N-alkenoxypyridinium salts and NaI, giving a variety