Highly efficient synthesis of 2,5-disubstituted pyrazines from (Z)-β-haloenol acetates
作者:Zhengwang Chen、Dongnai Ye、Guohai Xu、Min Ye、Liangxian Liu
DOI:10.1039/c3ob41164h
日期:——
A highly efficient synthesis of a wide range of 2,5-disubstituted pyrazines from (Z)-β-haloenol acetates is described. The reactions are conducted under convenient conditions and provide products with excellent regioselectivity in moderate to excellent yields with a broad substrate scope, including a variety of aromatic and aliphatic haloenol acetates.
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.