Heteropoly Acid as Efficient, Cost-effective, and Recyclable Solid Acid for the Rapid Synthesis of Substituted Imidazolines
作者:J. S. Yadav、B. V. Subba Reddy、T. Pandurangam、U. V. Subba Reddy
DOI:10.1246/cl.2008.824
日期:2008.8.5
Aziridines undergo smooth ring opening with a range of nitriles in the presence of 10 mol % of phosphomolybdic acid supported on silica gel (PMA–SiO2) under mild reaction conditions to afford the corresponding imidazolines in good yields and with high regioselectivity. The use of silica gel as solid support facilitates an easy recovery and reuse of the catalyst thereby making the process quite simple, more convenient, and cost-effective.
A one-pot, three-component cascade reaction combining photoredox catalyzed radical addition and formal [3 + 2] annulation was developed. With this approach, highly concise syntheses of imidazoline and oxazolidine derivatives have been achieved. The advantages of this transformation are good to excellent yields, mild reaction conditions, operational simplicity, and easy accessibility of raw materials
Gold(III) Chloride/Silver Triflate: A Highly Efficient Catalyst for Ring-Opening Reaction of Aziridines with Electron-Rich Arenes
作者:Xiaoyu Sun、Wei Sun、Renhua Fan、Jie Wu
DOI:10.1002/adsc.200700101
日期:2007.9.3
Gold(III) chloride/silver triflate was found to a highly efficient catalyst in the ring-opening of aziridines with electron-rich arenes and the desired β-arylamines were afforded in good to excellent yields under mild reaction conditions.
investigation of amidine synthesis, we used this approach to explore how an Fe-catalyzed aziridination can lead to an imidazoline when run in acetonitrile. We report that the synthesis of imidazoline by combination of styrene, acetonitrile, an iron catalyst and a nitrene precursor occurs along a new kind of multicomponent reaction. The formation of imidazoline results from acetonitrile interception of a benzyl
An efficient route to regioselective opening of N-tosylaziridines with zinc(II) halides
作者:Manas K. Ghorai、Kalpataru Das、Amit Kumar、Koena Ghosh
DOI:10.1016/j.tetlet.2005.04.006
日期:2005.6
An efficient route for the regio- and stereoselective ring opening of N-tosylaziridines with zinc dihalides (ZnX2, X = Cl, Br, I) is described. Depending on the solvent and Zn(II) halide, β-halo amines or imidazolines are obtained selectively in good to excellent yields.