Trialkylphosphine-Mediated Synthesis of 2-Acyl Furans from Ynenones
作者:Chao Xu、Stéphane Wittmann、Manuel Gemander、Venla Ruohonen、J. Stephen Clark
DOI:10.1021/acs.orglett.7b01533
日期:2017.7.7
A novel reaction for the synthesis of 2-acyl furans is reported. The reaction is believed to proceed by sequential addition of a trialkylphosphine to an ynenone, 5-exo-dig cyclization to form the furan, and oxidation of the resulting phosphonium ylide with molecular oxygen. Many common functional groups are tolerated during the reaction, and the products are obtained in good to excellent yield under
Organocatalytic Synthesis of Highly Substituted Furfuryl Alcohols and Amines
作者:J. Stephen Clark、Alistair Boyer、Anthony Aimon、Paloma Engel García、David M. Lindsay、Andrew D. F. Symington、Yves Danoy
DOI:10.1002/anie.201207300
日期:2012.11.26
Top cat! Tetrahydrothiophene is an efficient organocatalyst for the synthesis of highlysubstitutedfurfuryl products from readily accessible electron‐poor enynes under neutral reaction conditions. This process is applicable to a wide range of nucleophiles and enynes and can be used in a domino organocatalysis sequence.
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,