Efficient Synthesis of Benzofurans Utilizing [3,3]-Sigmatropic Rearrangement Triggered byN-Trifluoroacetylation of Oxime Ethers: Short Synthesis of Natural 2-Arylbenzofurans
作者:Norihiko Takeda、Okiko Miyata、Takeaki Naito
DOI:10.1002/ejoc.200601001
日期:2007.3
synthetic method for the preparation of benzofurans has been developed. The key step of this method is the [3,3]-sigmatropic rearrangement of N-trifluoroacetyl-ene-hydroxylamines, which was triggered by acylation of oxime ethers. TFAA has been proved to be the best reagent to induce [3,3]-sigmatropic rearrangement for the synthesis of cyclic oracyclic dihydrobenzofurans. On the other hand, the TFAT-DMAP
Rh(<scp>iii</scp>)-catalyzed and alcohol-involved carbenoid C–H insertion into N-phenoxyacetamides using α-diazomalonates
作者:Jie Zhou、Jingjing Shi、Xuelei Liu、Jinlong Jia、Huacan Song、H. Eric Xu、Wei Yi
DOI:10.1039/c5cc00354g
日期:——
Here a new, mild and efficient Rh(iii)-catalyzed and alcohol-involved carbenoid insertion (ortho-alkylation) intoN-phenoxyacetamides using α-diazomalonates has been developed.
Electrochemical selenium-catalyzed <i>para</i>-amination of <i>N</i>-aryloxyamides: access to polysubstituted aminophenols
作者:Lei Gao、Zhi-Feng Wang、Lin-Wei Wang、Hai-Tao Tang、Zu-Yu Mo、Mu-Xue He
DOI:10.1039/d3ob01116j
日期:——
Aminophenols are a class of important compounds with various pharmacological activities such as anticancer, anti-inflammatory, antimalarial, and antibacterial activities. Herein, we introduce a mild and efficient electrochemical selenium-catalyzed strategy to synthesize polysubstituted aminophenols. High atom efficiency and transition metal-free and oxidant-free conditions are the striking features
fluorophore-tagged RhIII-based fluorogenic coumarin-ethylene probes (CEPs) using this strategy for the selective and quantitative detection of ethylene. CEP-1 exhibited the highest sensitivity with a limit of detection of ethylene at 52 ppb in air. Furthermore, CEP-1 was successfully applied for imaging in living CHO-K1 cells and for monitoring endogenous-induced changes in ethylene biosynthesis in tobacco