Syntheses of <i>Z</i>-Iodovinylfurans and 2-Acyl Furans via Controllable Cyclization of Ynenones
作者:Mengxue Li、Fang Yang、Ting Yuan、Haoyang Li、Jian Li、Zi-Sheng Chen、Kegong Ji
DOI:10.1021/acs.joc.9b01852
日期:2019.10.4
Z-iodovinylfurans and 2-acyl furans promoted by NIS via controllable cyclization of ynenones is reported. The reaction proceeded by sequential 5-exo-dig electrophilic cyclization to intermediate 2-(iodomethylene)-2H-furanium cation D, providing a range of synthetically valuable and useful trisubstituted furan derivatives 2 and 3 in moderate to excellent yields. This approach is metal-free, mild, and atom-economic,
据报道,NIS通过可控制的炔诺酮环化而合成了Z-碘乙烯基呋喃和2-酰基呋喃。反应通过顺序地5-exo-dig亲电环化进行,以生成中间体2-(碘亚甲基)-2H-呋喃阳离子D,以中等到极好的收率提供了一系列具有合成价值的有用的三取代呋喃衍生物2和3。该方法无金属,温和且经济实惠,具有良好的选择性和高的立体选择性。