Rhodium(III)-Catalyzed [4+1] Annulation of Aromatic and Vinylic Carboxylic Acids with Allenes: An Efficient Method Towards Vinyl-Substituted Phthalides and 2-Furanones
A highly regio‐ and stereoselective synthesis of 3,3‐disubstituted phthalides from aryl carboxylic acids and allenes using a rhodium(III) catalyst has been demonstrated. The reaction features broad functional group tolerance and provides a simple and straightforward route to the synthesis of various 3‐vinyl‐substituted phthalides. Furthermore, the catalytic reaction can also be applied to the synthesis
A cobalt‐catalyzed oxidative annulation of amides with allenes to provide isoquinolin‐1(2H)‐ones and pyridones was explored. The new catalytic reaction proceeded through aminoquinoline‐directed C−H activation followed by unusual regioselective insertion, annulation, and isomerization. A variety of functionalized amides and allenes were converted into the corresponding products under mild reaction