Rhodium(III)-Catalyzed Synthesis of Cinnolinium Salts from Azobenzenes and Diazo Compounds
作者:Xiaohong Chen、Guangfan Zheng、Guoyong Song、Xingwei Li
DOI:10.1002/adsc.201800326
日期:2018.8.6
A Rh(III)‐catalyzed C−H activation of azobenzenes in the coupling with diazo compounds has been realized, providing a straightforward strategy to access functionalized cinnolinium triflates in high yields. This protocol features silver free mild reaction conditions and compatibility with diverse functional groups. The coupling proceeds via initial Rh(III)‐catalyzed C−H alkylation, followed by zinc
One-pot Synthesis of Oxindoles through C−H Alkylation and Intramolecular Cyclization of Azobenzenes with Internal Olefins
作者:Sang Hoon Han、Neeraj Kumar Mishra、Hyeim Jo、Yongguk Oh、Mijin Jeon、Saegun Kim、Woo Jung Kim、Jong Suk Lee、Hyung Sik Kim、In Su Kim
DOI:10.1002/adsc.201700147
日期:2017.7.17
as maleimides, maleates and fumarates, followed by reductiveintramolecularcyclization is described. A cationic rhodium catalyst in the presence of acetic acid additive in dichloroethane solvent was found to be the optimal catalytic system for the construction of ortho‐alkylated azobenzenes, which smoothly underwent the intramolecularcyclization leading to the formation of C3‐functionalized oxindoles