Journal
JOURNAL OF HETEROCYCLIC CHEMISTRY
Volume 55, Issue 9, Pages 2055-2060Publisher
WILEY
DOI: 10.1002/jhet.3242
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Funding
- Research Council of Ferdowsi University of Mashhad [3/44510]
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A straightforward approach for the regioselective synthesis of highly functionalized pyrazolo[5,1-b]purine from the annulation of 6-bromo-3-cyano-2-(ethylthio)-5-methyl-7-oxo-6,7-dihydropyrazolo[1,5-a]pyrimidine with thiourea as a bisnucleophilic reagent under reflux condition in CH3CN in the presence of Et3N has been developed. The N-alkylation of the synthesis compound was also accomplished. The true regioisomer was determined by D-2-NOESY NMR spectroscopy, as well.
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