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Note | Regular issue | Vol 75, No. 8, 2008, pp.2035-2042
Published online, 28th March, 2008
DOI: 10.3987/COM-08-11371
2-Pyrazolin-5-ones Bearing a Basic Dialkylaminoalkyl Substituent at the N1-Position: Preparation and NMR Spectroscopic Investigations

Barbara M. T. Wolf, Gernot A. Eller,* and Wolfgang Holzer*

*Department of Drug and Natural Product Synthesis, University of Vienna, Althanstrasse 14, A-1090 Vienna, Austria

Abstract

2n-5-ones (= tautomers to 5-hydroxypyrazols) bearing dialkylaminoyalkyl substituents at the ring nitrogen atom N-1 are prepared from the corresponding hydrazines and beta-ketoesters. Detailed NMR spectroscopic investigations (1H, 13C, 15N) with the obtained compounds are undertaken and the tautomerism of such pyrazolones in solution is discussed.