Synthesis of Unsymmetrically Substituted Bipyridines by Palladium-Catalyzed Direct C−H Arylation of Pyridine <i>N</i>-Oxides
作者:Sasa Duric、C. Christoph Tzschucke
DOI:10.1021/ol200565u
日期:2011.5.6
Substituted bipyridines were efficiently prepared by direct coupling between pyridine N-oxides and halopyridines using a palladium catalyst. Pyridine N-oxides with electron-withdrawing substitutents gave the best yields. This method allows the convenient preparation of 2,2′-, 2,3′-, and 2,4′-bipyridines which are useful as functionalized ligands for metal complexes or as building blocks for supramolecular
A Convenient Synthesis of Nitrogen-Containing Heterocycles Bearing Amino Substituents from Heteroaryl Triflates
作者:Sandro Cacchi、Antonella Carangio、Giancarlo Fabrizi、Leonardo Moro、Paola Pace
DOI:10.1055/s-1997-1041
日期:——
Nitrogen-containing heterocycles bearing amino substituents were prepared by the reaction of the corresponding nitrogen-containing heteroaryl triflates with amines. The reaction affords good results with primary and secondary amines, and with aliphatic and aromatic amines. The whole triflation/amination process can also be conducted as a one-pot operation.
Mo(CO)6 as a Solid CO Source in the Synthesis of Aryl/Heteroaryl Weinreb Amides under Microwave-Enhanced Condition
作者:Raghu Ningegowda、Savitha Bhaskaran、Ayyiliath M. Sajith、Chandrashekar Aswathanarayanappa、M. Syed Ali Padusha、Nanjunda Swamy Shivananju、Babu Shubha Priya
DOI:10.1071/ch16213
日期:——
The facile transformation of aryl/heteroaryl nonaflates into corresponding amides via Pd-catalyzed aminocarbonylation using Mo(CO)6 as a solid CO source under microwave-enhanced condition is reported. The method was found to be tolerant with respect to a diverse range of electronically biased aryl/heteroaryl nonaflates, and exceptional yields were obtained. The optimized protocol was further extended