Palladium-Catalyzed Condensation of N-Aryl Imines and Alkynylbenziodoxolones To Form Multisubstituted Furans

Abstract

A palladium(II) catalyst promotes condensation of an N-aryl imine and an alkynylbenziodoxolone derivative to afford a multisubstituted furan, whose substituents are derived from the alkynyl moiety (2- position), the imine (3- and 4-positions), and the 2- iodobenzoate moiety (5-position), along with an N- arylformamide under mild conditions. The 2-iodophenyl group of the furan product serves as a versatile handle for further transformations. A series of isotope-labeling experiments shed light on the bond reorganization process in this unusual condensation reaction, which includes cleavage of the C−C triple bond and fragmentation of the carboxylate moiety.

Publication
Lu, B.; Wu, J.; Yoshikai, N. J. Am. Chem. Soc. 2014, 136, 11598-11601.