MnO2 Promoted Sequential C–O and C–N Bond Formation via C–H Activation of Methylarenes: A New Approach to Amides
摘要:
A novel and efficient approach for the synthesis of amides has been developed through manganese dioxide promoted nondirected C-H activation of methylarenes under mild reaction conditions employing N-chloroamines as effective coupling partners.
activation for this reaction. The benzamides were directly formed from alcohols and amine hydrochloride salts in short reaction times with yields up to 84 % and TOFs (turnover frequencies) up to 33.6 h–1. Among the examined transition metals, only nontoxic and inexpensive FeCl2·4H2O together with caffeine as a stabilizing ligand provided a uniquely efficient catalyticsystem for the transformation. Natural
Brønsted acid sites in the Beta zeolite induced highly efficient amidation of styrene in the aqueous phase
作者:Jiteng Liu、Xueqin Jia、Lei Zhang、Wenqian Fu
DOI:10.1039/d3nj05870k
日期:——
an environmentally friendly catalyst system is a highly attractive strategy for organicsynthesis. In this work, a H-form mesoporous Beta (H-MBeta) zeolite with an irregular spherical particle shape was synthesized and was found to realize the directamidation of styrene and nitriles for the synthesis of N-alkylated amides in the aqueous phase. This strong acidic H-MBeta catalyst exhibited superior activity
Iron‐Based Deep Eutectic Solvents: Key Players for Amide and Sulfonamide Synthesis and Alcohol Oxidation
作者:Luciana Cicco、Sara Urselli、Claudia Favia、Filippo Maria Perna、Paola Vitale、Vito Capriati
DOI:10.1002/ejoc.202400300
日期:2024.6.24
Selective and sustainable oxidation of secondaryalcohols to their corresponding carbonyl compounds, alongside their applications as selective mono-alkylating reagents for both amide and arylsulfonamide derivatives, is achieved under aerobic and mild (40 °C) conditions in reusable Fe-based Lewis acidic deep eutectic solvents.
A convenient and user-friendly method to yield benzamides from primary and secondary amines and various benzylic alcohols in the presence of a cheap iron salt (FeCl2 center dot 4H(2)O) and tert-butylhydroperoxide (70% in water) as a stoichiometric oxidant is described. Control experiments indicated that this reaction might involve radical species. This method proved to be general, generating a family of 30 benzamides and was applied to the preparative synthesis of anti-anxiety drug moclobemide. (C) 2014 Published by Elsevier Ltd.