%0 Journal Article
%T Dipyrazolo[1,5-a:4',3'-c]pyridines ¨C a new heterocyclic system accessed via multicomponent reaction
%A Wolfgang Holzer
%A Gyt£¿ Vilkauskait£¿
%A Egl£¿ Arba£¿iauskien£¿
%A Algirdas £¿a£¿kus
%J Beilstein Journal of Organic Chemistry
%D 2012
%I 
%R 10.3762/bjoc.8.251
%X The synthesis of dipyrazolo[1,5-a:4',3'-c]pyridines is described. Easily obtainable 5-alkynylpyrazole-4-carbaldehydes, p-toluenesulfonyl hydrazide, and an aldehyde or ketone containing an ¦Á-hydrogen atom were reacted in a silver triflate catalyzed multicomponent reaction affording new tricyclic compounds with a dipyrazolo[1,5-a:4',3'-c]pyridine core. Detailed NMR spectroscopic investigations (1H, 13C and 15N) were undertaken with all obtained compounds.
%K cyclization
%K nitrogen heterocycles
%K NMR spectroscopy
%K multicomponent reaction
%K pyrazole
%U http://dx.doi.org/10.3762/bjoc.8.251