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.