Title of article
Preparation of 6-chloropyrazolo[3,4-b]pyridine-5-carbaldehydes by Vilsmeier–Haack reaction and its use in the synthesis of heterocyclic chalcones and dipyrazolopyridines
Author/Authors
Quiroga، نويسنده , , Jairo and Diaz، نويسنده , , Yurina and Insuasty، نويسنده , , Braulio and Abon?a، نويسنده , , Rodrigo and Nogueras، نويسنده , , Manuel and Cobo، نويسنده , , Justo، نويسنده ,
Issue Information
هفته نامه با شماره پیاپی سال 2010
Pages
3
From page
2928
To page
2930
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.
Keywords
Formylation , 4-b]pyridine , Chalcones , 4-b:4? , 3?-e]pyridine , Vilsmeier–Haack reaction
Journal title
Tetrahedron Letters
Serial Year
2010
Journal title
Tetrahedron Letters
Record number
1872234
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