Synthesis of 2,5-Disubstituted 3-Iodofurans via Palladium-Catalyzed Coupling and Iodocyclization of Terminal Alkynes
作者:Zhengwang Chen、Gao Huang、Huanfeng Jiang、Huawen Huang、Xiaoyan Pan
DOI:10.1021/jo1023987
日期:2011.2.18
2,5-Disubstituted 3-iodofurans are readily prepared under very mild reaction conditions by the palladium/copper-catalyzed cross-coupling of (Z)-β-bromoenol acetates and terminal alkynes, followed by iodocyclization. The useful intermediates conjugated enyne acetates are obtained in high yields in the transformation. Aryl- and alkyl-substituted alkynes undergo iodocyclization in good yields. The resulting
Gold-Catalyzed Regio- and Stereoselective Addition of Carboxylic Acids to Iodoalkynes: Access to (<i>Z</i>)-β-Iodoenol Esters and 1,4-Disubstituted (<i>Z</i>)-Enynyl Esters
作者:Pedro J. González-Liste、Javier Francos、Sergio E. García-Garrido、Victorio Cadierno
DOI:10.1021/acs.joc.6b02712
日期:2017.2.3
variety of (Z)-β-iodoenol esters (39 examples) could be synthesized under mild reaction conditions through the regio- and stereospecific intermolecular addition of carboxylicacids to iodoalkynes. Sonogashira coupling of representative (Z)-β-iodoenol esters with terminal alkynes, alkynols, and 1,3-enynes allowed also the access to different 1,4-disubstituted (Z)-enynyl esters in excellent yields.