Rapid Organocatalytic Formation of Carbon Monoxide: Application towards Carbonylative Cross Couplings
作者:Ben Zoller、Josef Zapp、Peter H. Huy
DOI:10.1002/chem.202002746
日期:2020.8.3
Sonogashira reaction at roomtemperature employing intrinsically difficult electron‐deficient aryl iodides. Commercial 13C‐enriched formic acid facilitates the production of radiolabeled compounds as exemplified by the pharmaceutical Moclobemide. Finally, comparative experiments verified that the present method is highly superior to other protocols for the activation of carboxylicacids.
Recyclable and reusable PdCl2(PPh3)2/PEG-2000/H2O system for the carbonylative Sonogashira coupling reaction of aryl iodides with alkynes
作者:Hong Zhao、Mingzhu Cheng、Jiatao Zhang、Mingzhong Cai
DOI:10.1039/c3gc42278j
日期:——
PdCl2(PPh3)2 in a mixture of water and poly(ethylene glycol) (PEG-2000) is shown to be an extremely active catalyst for the carbonylative Sonogashira coupling reaction of aryl iodides with terminal alkynes. The reaction can be conducted under an atmospheric pressure of carbon monoxide at 25 °C with Et3N as a base, yielding a variety of alkynyl ketones in good to excellent yields. Application of this synthetic method to prepare flavones from o-iodophenol and terminal alkynes was also achieved. The isolation of the products is readily achieved by extraction with diethyl ether, and the PdCl2(PPh3)2/PEG-2000/H2O system can be easily recycled and reused six times without any loss of catalytic activity.