Iron(III)-catalyzed highly efficient, one-pot synthesis of triazolo[1,2-a]indazoletriones and spirotriazolo[1,2-a]indazoletetraones

Article abstract of DOI:10.1246/cl.130164

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 excelle