The synthesis of 2-substituted furans via palladium- and iron-catalyzed
coupling utilizing 2-bromofuran is described. Whereas palladium-catalyzed
Suzuki coupling effectively provided the corresponding aryl furans,
little or no product was obtained by palladium-catalyzed coupling
with various alkyl nucleophiles. Iron-catalyzed coupling proved
effective for the synthesis of primary and secondary alkyl furans
in modest yields and aryl furans in low yields.
furan - cross-coupling - catalysis - palladium - iron