catalyzed carbonylation of allenyl ketones has been investigated. Carbonylative dimerization predominantly proceeded to afford bis(3-furanyl)methanones 2 as the major products. The use of DMSO strikingly changed the course of the reaction, affording methyl 3-furancarboxylates 3 as the major products. DFT calculations revealed that DMSO stabilized the methanol-coordinated intermediate, leading to methoxycarbonylation
Gold-catalyzed efficient synthesis of 2,4-disubstituted furans from aryloxy-enynes
作者:Ende Li、Wenjun Yao、Xin Xie、Chengyu Wang、Yushang Shao、Yanzhong Li
DOI:10.1039/c2ob07173h
日期:——
(E)-1-aryloxy-1-en-3-ynes has been prepared by Sonogashiracoupling of 2-bromo-3-aryloxypropenoates with terminal alkynes using Pd(PPh3)4 and CuI as the catalysts in Et3N. The resulting enynyl-aryl ethers are found to be highly applicable to the synthesis of 2,4-disubstituted furans with an ester group at C-4 position through an Au/Ag-catalyzed annulation reaction under extremely mild reaction conditions.
Process for preparing biaryls in the presence of palladophosphacyclobutane catalysts
申请人:Clariant GmbH
公开号:US06392047B1
公开(公告)日:2002-05-21
Biaryls, e,g,. biphenyls, phenylpyridines, phenylfurans, phenylpyrroles, phenylthiophenes, bipyridines, pyridylfurans or pyridylpyrroles are prepared in high yields by coupling aromatics with an aromatic boric acid or boric ester in the presence of a palladaphosphacyclobutane catalyst.
Chemo-Enzymatic Metathesis/Aromatization Cascades for the Synthesis of Furans: Disclosing the Aromatizing Activity of Laccase/TEMPO in Oxygen-Containing Heterocycles
作者:Caterina Risi、Fei Zhao、Daniele Castagnolo
DOI:10.1021/acscatal.9b02452
日期:2019.8.2
The unprecedented Trametes versicolor laccase/TEMPO-catalyzed aromatization of 2,5-dihydrofurans to furans is described. A variety of furan derivatives have been synthesized in moderate to high conversions (21–99%) and yields (20–76%) under mild reaction conditions. This work reveals the aromatization ability of the Trametes versicolor laccase/TEMPO system in synthesizing oxygen-containing heterocycles