Nucleophilic aromatic substitution of non-activated aryl fluorides with aliphatic amides
作者:Akihisa Matsuura、Yusuke Ano、Naoto Chatani
DOI:10.1039/d2cc02999e
日期:——
Nucleophilicaromaticsubstitution (SNAr) reactions of non-activated aryl fluorides with amide enolates are reported. The reaction proceeds under relatively mild reaction conditions. Lactams also participate in the reaction to give 2-arylated lactams. DFT calculations suggest that the reaction proceeds through a concerted SNAr pathway.
报道了未活化的芳基氟化物与酰胺烯醇化物的亲核芳族取代 (S N Ar) 反应。该反应在相对温和的反应条件下进行。内酰胺也参与反应生成 2-芳基化内酰胺。DFT 计算表明反应通过协同的 S N Ar 途径进行。
Divergent Synthesis of α-Fluorinated Carbonyl and Carboxyl Derivatives by Double Electrophilic Activation of Amides
作者:Amaury Dubart、Gwilherm Evano
DOI:10.1021/acs.orglett.1c03450
日期:2021.11.19
entry to α-fluorinated carbonyl and carboxyl derivatives is reported. Upon activation of amides with triflic anhydride and a 2-halo-pyridine and subsequent trapping of the resulting keteniminium ions with nucleophiles followed by a second electrophilic activation with NFSI and final hydrolysis, a range of amides can be transformed to α-fluorinated ketones, esters, and amides under mild conditions. Moreover
and site-selective nitrate-promoted C–H bond fluorinationusing various weak coordinating amides as intrinsic directing groups was developed. Diverse tertiary and secondary amides underwent selective aromatic C–H bond fluorination, which features broad substrate scope, good regioselectivity, and mild conditions. Moreover, the late-stage C–H bond fluorination of the challenging benzeneacetamides via distal