Sixteen 2,2'-bifurans with aryl substituents are reported. The copper-mediated oxidative coupling of lithium salt of furan led to the formation of 2,2'-bifuran, which was brominated with either 2 eq. or 4 eq. NBS to afford 5,5 '-dibromo-2,2'-bifuran and 3,3',5,5'-tetrabromo-2,2'-bifuran. The palladium-catalyzed Suzuki reactions between dibromo or tetrabormo-bifuran and arylboronic acid were employed to furnish the title compounds, which were characterized by NMR spectra and mass spectra.
Decarboxylative homocoupling of (hetero)aromatic carboxylic acids
作者:Josep Cornella、Hicham Lahlali、Igor Larrosa
DOI:10.1039/c0cc01943g
日期:——
A variety of hetero(aromatic) carboxylicacids are shown to undergo decarboxylative homocoupling, mediated by a Pd/Ag system. This novel methodology for the synthesis of symmetrical biaryls avoids the use of haloarenes and organometallic compounds as starting materials.