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ChemInform Abstract: Three-Component Condensation of 5-Aminopyrazole Derivatives with Isatins and Meldrum′s Acid. Synthesis of 1,7-Dihydrospiro[pyrazolo [3,4-b]pyridine-4,3′-indole]-2′,6(1′H,5H)-diones.

✍ Scribed by B. V. Lichitsky; A. N. Komogortsev; A. A. Dudinov; M. M. Krayushkin

Publisher: John Wiley and Sons
Year: 2010
Weight: 21 KB
Volume: 41
Category: Article
ISSN: 0931-7597
DOI: 10.1002/chin.201048136

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## Abstract 3‐Amino‐5‐methylpyrazole, ethyl cyanoacetate and aromatic aldehydes undergo an acid‐catalyzed condensation to generate diastereomeric mixtures of pyrazolopyridinones (III)/(IV).