J. Quiroga, Y. Díaz, B. Insuasty
May 26, 2010
Citations
0
Influential Citations
12
Citations
Journal
Tetrahedron Letters
Abstract
Abstract Novel 6-chloropyrazolo[3,4- b ]pyridine-5-carbaldehydes 5 have been synthesized from the 4,5-dihydropyrazolo[3,4- b ]pyridine-6-ones 4 via Vilsmeier–Haack reaction. Further treatment of carbaldehydes 5 with acetophenones 6 and hydrazine hydrate afforded chalcone analogues 7 and dipyrazolo[3,4- b :4′,3 ′ - e ]pyridines 8 , respectively.