Pd-Catalyzed Selective Carbonylative and Non-carbonylative Couplings of Propiolic Acid: One-Pot Synthesis of Diarylalkynones
作者:Wonyoung Kim、Kyungho Park、Ahbyeol Park、Juseok Choe、Sunwoo Lee
DOI:10.1021/ol4004349
日期:2013.4.5
Diarylalkynones were synthesized from one-potPd-catalyzedcarbonylative and noncarbonylative coupling reactions of propiolicacid with aryl iodides under a carbon monoxide atmosphere. Aryl iodide (2.0 equiv), propiolicacid (1.0 equiv), Pd(PPh3)2Cl2 (5 mol %), CuCl (10 mol %), Et3N (6.0 equiv), and CO (8 atm) were reacted under optimized conditions in CH3CN at 80 °C for 1 h. This process afforded
Transition Metal‐Free Synthesis of Substituted Isothiazoles
<i>via</i>
Three‐Component Annulation of Alkynones, Xanthate and NH
<sub>4</sub>
I
作者:Jian Li、Jiaming Li、Xiaoliang Ji、Qiang Liu、Lu Chen、Yubing Huang、Yibiao Li
DOI:10.1002/adsc.202001179
日期:2021.2.16
A protocol was described to access diverse isothiazoles with functionalization potential via transition metal‐free three‐component annulation of alkynones, potassium ethylxanthate (EtOCS2K) and ammonium iodide (NH4I). A sequential regioselective hydroamination/thiocarbonylation/intramolecular cyclizationcascade achieved the efficient formation of consecutive C−N, C−S and N−S bonds in a one‐pot process
The difunctionalization of terminal alkynes was achieved with silver fluoride (AgF) and N-bromosuccinimide (NBS) as halogen sources. The presence of the halide moiety greatly enhances the reactivity of the vinyl fluoride compounds that can probably can be transformed into various products that are difficult or even impossible to obtain via direct fluorination. Meanwhile, the monofluoro<.>alkenes were
Zinc-catalyzed C–H alkenylation of quinoline <i>N</i>-oxides with ynones: a new strategy towards quinoline-enol scaffolds
作者:Yan Hu、Jiang Nan、Xue Gong、Jiawen Zhang、Jiacheng Yin、Yangmin Ma
DOI:10.1039/d1cc00245g
日期:——
A zinc-catalyzed C–H alkenylation of quinoline N-oxides with ynones has been developed to rapidly assemble a broad collection of valuable quinoline-enol organic architectures.
Synthesis of 3-(2-quinolyl) chromones from ynones and quinoline <i>N</i>-oxides <i>via</i> tandem reactions under transition metal- and additive-free conditions
A novel method for the synthesis of 3-(2-quinolyl) chromones through a tandem [3+2] cycloaddition/ring-opening/O-arylation from ynones and quinoline N-oxides has been developed. This protocol proceeds under transition metal- and additive-free conditions and can be amplified to the gram level in 91% yield. 3-(1-Isoquinolyl) and 3-(2-pyridyl) chromones are also successfully synthesized using isoquinoline