Under different conditions, the reaction of propargyl alcohols and terminal alkynes leads to the selective formation of 1,4-diynes and polysubstituted furans/pyrroles. Water is the only byproduct in the selective synthesis of 1,4-diynes and pyrroles, and the strategy for the furan synthesis is of 100% atom economy.
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。
Cu(<scp>ii</scp>)-catalyzed aerobic oxidative coupling of furans with indoles enables expeditious synthesis of indolyl–furans with blue fluorescence
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