An efficientapproach to 2,5-disubstitutedfurans has been developed by utilizing gold-catalyzed sequential nucleophilic attack onto metal-complexed alkynes with complete regioselectivity. The reaction proceeds efficiently under mild conditions with commercially available catalysts to afford furans in moderate to excellent yields (up to 96 %) with high diversity.
Palladium‐Catalyzed Cross‐Coupling of Furfuryl Alcohols with Arylboronic Acids
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Aromatization‐Driven Carbon−Carbon Bond Cleavage to Synthesize 5‐Arylfurfuryl Alcohols and 2,5‐Diaryl Furans
作者:Guanghao Huang、Biaolin Yin
DOI:10.1002/adsc.201900799
日期:2019.12.17
Herein we report a protocol for novel palladium‐catalyzed cross‐coupling reactions of sustainably produced primary furfuryl alcohols with arylboronicacids to deliver 5‐arylfurfuryl alcohols and 2,5‐diaryl furans. Hammett plot analysis suggested that the reaction mechanism involved aromatization‐driven cleavage of the carbon−carbon bond of a furan oxonium ion intermediate. This protocol provides a
Ru- and Pd-Catalysed Synthesis of 2-Arylfurans by One-Flask Heck Arylation/Oxidation
作者:Bernd Schmidt、Diana Geißler
DOI:10.1002/ejoc.201100549
日期:2011.7.19
2,5-Disubstituted furans were synthesized by one-flask Heck arylation/oxidation sequences. The starting materials are 2-substituted 2,3-dihydrofurans, conveniently available by RCM/isomerization sequences, and arenediazonium salts. These react in ligand-free Heck reactions to afford 2,5-disub-stituted 2,5-dihydrofurans, which are oxidized to the corresponding furans without isolation or intermediate
The palladium-catalyzed activation of carbon-carbon bonds in derivatives of hydroxymethylfurfural (HMF) has been developed for the arylation with iodobenzenes. Mechanistic studies suggest a decarboxylative mechanism. This strategy offers an efficient and sustainable approach for the synthesis of arylfuran derivatives.
Direct β-Arylation of Furans with Aryl Iodides Catalyzed by Dinuclear Palladium Complexes
作者:Naofumi Tsukada、Takahiro Goto、Hayate Kato
DOI:10.3987/com-17-13824
日期:——
Dinuclear palladium complexes formed by a chelate-bridging ligand showed beta-selectivity in the direct arylation of furans with iodoarenes. In contrast, the arylation using PPh3, or bpy as ligands gave alpha-arylfurans as major products. The arylation can be applied to several furans bearing functional groups except electron-withdrawing groups.