<i>C</i>-Alkylation of <i>N</i>-alkylamides with styrenes in air and scale-up using a microwave flow reactor
作者:Joshua P. Barham、Souma Tamaoki、Hiromichi Egami、Noriyuki Ohneda、Tadashi Okamoto、Hiromichi Odajima、Yoshitaka Hamashima
DOI:10.1039/c8ob02282h
日期:——
N-alkylamides with styrenes is reported, proceeding in ambient air/moisture to give arylbutanamides and pharmaceutically-relevant scaffolds in excellent mass balance. Various amide and styrenederivatives were tolerated, rapidly affording molecular complexity in a single step; thus highlighting the future utility of this transformation in the synthetic chemistry toolbox. Reaction scalability (up to
Tungsten-Catalyzed Transamidation of Tertiary Alkyl Amides
作者:Fang-Fang Feng、Xuan-Yu Liu、Chi Wai Cheung、Jun-An Ma
DOI:10.1021/acscatal.1c01840
日期:2021.6.18
chloride as a catalyst and chlorotrimethylsilane as an additive. The highly electrophilic and oxophilic tungsten catalyst enables the selective scission of a C–N bond of tertiary alkyl amides to effect transamidation of a myriad of structurally and electronically diverse tertiary alkyl amides and amines. Mechanistic study implies that the synergistic effect of the catalyst and the additive could pronouncedly
Herein, we report a metal-free synthesis of cyclic amidines, oxazines, and an oxazinone under mild conditions by electrophilic amide activation. This strategy features an unusual Umpolung cyclization mode and enables the smooth union of α-aryl amides and diverse alkylazides, effectively rerouting our previously reported α-amination transform.
Palladium-Catalyzed Hydrocarbonylative C–N Coupling of Alkenes with Amides
作者:Xibing Zhou、Guoying Zhang、Bao Gao、Hanmin Huang
DOI:10.1021/acs.orglett.8b00538
日期:2018.4.20
An efficient palladium-catalyzed hydrocarbonylative C–N coupling of alkenes with amides has been developed. The reaction was performed via hydrocarbonylation of alkenes, followed by acyl metathesis with amides. Both intermolecular and intramolecular reactions proceed smoothly to give either branched or linear amides in high turnover number (3500) with NH4Cl or NMP·HCl as a proton source under the palladium
A palladium-catalyzed N-acylation of tertiary amines by carboxylic acids was achieved through C–N cleavage. This reaction showed a wide substrate scope. Both aromatic and aliphatic acids served well as the acylating reagents and coupled with tertiary amines to produce the corresponding amides in good to excellent yields. With the strategy, bioactive carboxylic acids were also efficiently modified,