importance in various realms of chemistry, furan occupies a position of eminence among heterocycles. Despite the availability of many methodologies for the synthesis of variably substitutedfurans, a modular convenient synthesis of 2,4-disubstituted furans remains challenging. The present work attempts to bridge that gap through a novel annulation-based approach using feedstock chemicals such as methyl ketones
Oxidative Cross-Coupling of Allenyl Ketones and Organoboronic Acids: Expeditious Synthesis of Highly Substituted Furans
作者:Ying Xia、Yamu Xia、Rui Ge、Zhen Liu、Qing Xiao、Yan Zhang、Jianbo Wang
DOI:10.1002/anie.201400500
日期:2014.4.7
Allenylketones are employed as coupling partners in palladium‐catalyzed oxidative cross‐coupling reactions with organoboronicacids. This reaction constitutes an efficient methodology for the synthesis of highlysubstitutedfuran derivatives. Palladium‐carbene migratory insertion is proposed as the key step in this transformation.
Suzuki–Miyaura cross-coupling reaction of 1,2-oxaborol-2(5H)-ols with carboxylic anhydrides: a new method to furans
作者:Tao Yu、Xin-Yan Wu、Jun Yang
DOI:10.1016/j.tetlet.2014.05.106
日期:2014.7
construct furans via a Suzuki–Miyaura cross-coupling reaction of 1,2-oxaborol-2(5H)-ols with carboxylicanhydrides. In the presence of Pd(OAc)2/PCy3, the multi-substituted alkenylboron compounds could couple with anhydrides to obtain furans in moderate-to-good yields. The addition of bases promoted the coupling reaction, and the plausible reaction mechanism was proposed.
Extended Version of the Corey–Chaykovsky Reaction: Synthesis of 2,4-Substituted Furans by the Treatment of β-Dialkylamino Chalcones with Dimethylsulfonium Methylide
作者:Roman O. Shcherbakov、Danil A. Myasnikov、Igor V. Trushkov、Maxim G. Uchuskin
DOI:10.1021/acs.joc.3c00203
日期:2023.7.7
We describe the synthesis of functionalized furans using the concept of the extended Corey–Chaykovsky reaction. Namely, β,β-disubstituted α,β-unsaturated ketones were treated with dimethylsulfonium methylide to give vinyloxiranes, which immediately rearranged into the corresponding furans. The developed approach allows for synthesizing a broad range of unsymmetrically di- and trisubstituted furans
processes, there has been a renewed focus on utilizing earth-abundant metal catalysts to expand the repertoire of organic reactions and processes. In this work, we have explored the atom-economic oxidative coupling between two important electron-rich heterocycles - indoles and furans - using commonly available, inexpensive metal catalyst CuCl2·2H2O (<0.25$ per g) to develop an expeditious synthesis