An efficient synthesis of 2,3,5-trisubstituted furans from α,β-unsaturated ketones
作者:Catherine D. Brown、J.Michael Chong、Lixin Shen
DOI:10.1016/s0040-4020(99)00898-4
日期:1999.12
A simple, regioselective synthesis of 2,3,5-trisubstituted furans is described. Conjugate addition of alkynylboronates to α,β-unsaturatedketones, followed by acid-catalyzed cyclization of the resulting γ-alkynyl ketones affords trisubstituted furans in 31–97% overall yields.
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
One-pot synthesis of 2-methylfurans from 3-(trimethylsilyl)propargyl acetates promoted by trimethylsilyl trifluoromethanesulfonate
作者:Danielle E. Sklar、Alex V. Helbling、Yiqi Liu、C. Wade Downey
DOI:10.1016/j.tetlet.2021.153424
日期:2021.12
In the presence of trimethylsilyl trifluoromethanesulfonate (TMSOTf) and triethylamine, 3-(trimethylsilyl)propargyl carboxylates undergo a one-pot alkylation-cyclization-desilylation reaction with ketones to produce 2-methylfurans. Alkylation at 0 °C in methylene chloride, followed by acid-catalyzed cyclization at room temperature, provides the furans in 52–86% yield. Cyclization and desilylation appear
在三氟甲磺酸三甲基甲硅烷基酯 (TMSOTf) 和三乙胺的存在下,羧酸 3-(三甲基甲硅烷基)炔丙基酯与酮进行一锅烷基化-环化-脱甲硅烷基化反应,生成 2-甲基呋喃。在 0 °C 下在二氯甲烷中烷基化,然后在室温下酸催化环化,以 52-86% 的产率提供呋喃。环化和脱甲硅烷基化似乎由在初始取代反应完成后将反应混合物暴露于水中而原位生成的三氟甲磺酸促进。
Gold Catalyzed Synthesis of Substituted Furan by Intermolecular Cascade Reaction of Propargyl Alcohol and Alkyne
作者:Seyedmorteza Hosseyni、Yijin Su、Xiaodong Shi
DOI:10.1021/acs.orglett.5b02980
日期:2015.12.18
Using a combination of triazole-gold (TA-Au) and copper catalysts, the substituted furan was achieved in one pot through a three-step reactioncascade. The reaction tolerates a large substrate scope with simple starting materials. The desired di-, tri-, and tetrasubstituted furans were prepared in good to excellent yields.
Copper(II) Triflate-Catalyzed Nucleophilic Substitution of Propargylic Acetates with Enoxysilanes. A Straightforward Synthetic Route to Polysubstituted Furans
作者:Zhuang-ping Zhan、Shao-pei Wang、Xu-bin Cai、Hui-juan Liu、Jing-liang Yu、Yuan-yuan Cui
DOI:10.1002/adsc.200700234
日期:2007.9.3
A novel and efficient procedure for the synthesis of γ-alkynyl ketones by the nucleophilic substitution of propargylic acetates with enoxysilanes in the presence of a catalytic amount of Copper(II) triflate, has been developed. The substitution reaction can be followed by a 4-toluenesulfonic acid-catalyzed cyclization without purification of the γ-alkynyl ketone intermediates, offering a straightforward