Iron(III)-catalyzed Highly Efficient, One-pot Synthesis of Triazolo[1,2-<i>a</i>]indazoletriones and Spirotriazolo[1,2-<i>a</i>]indazoletetraones
作者:B. V. Subba Reddy、N. Umadevi、G. Narasimhulu、J. S. Yadav
DOI:10.1246/cl.130164
日期:2013.8.5
Three-component coupling (3CC) of aldehyde, 1,3-dione, and 4-phenylurazole has been achieved in the presence of 10 mol % anhydrous FeCl3 in acetonitrile under reflux conditions to afford the corresponding triazolo[1,2-a]indazoletriones in excellent yields while the coupling of isatins with 4-phenylurazole and 1,3-diones gave the spirotriazolo[1,2-a]indazoletetraones under similar conditions.