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.
[3+2] Cycloaddition of a series of substituted N-tosylaziridines with various nitriles promoted by Bi(OTf)3 is described for the synthesis of substituted imidazolines under mild reaction conditions. The procedure works well over a range of substrates to give the corresponding products in good to excellent yields (up to 99 %).