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Oxazepines and thiazepines 46. Synthesis of tetracyclic 1,5-benzothiazepines by the reaction of α,β,γ,δ-unsaturated ketones with 2-aminothiophenol
Lévai, Albert; Jekő, József
ARKIVOC,
01/2009, Letnik:
2008, Številka:
17
Journal Article, Web Resource
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Synthesis of Pyrazoles by Treatment of 3-Benzylchromones, 3-Benzylflavones and Their 4-Thio Analogues with Hydrazine
Lévai, Albert; Silva, Artur M. S.; Cavaleiro, José A. S. ...
European Journal of Organic Chemistry,
06/2006, Letnik:
2006, Številka:
12
Book Review, Journal Article
The synthesis of pyrazoles 13–24 has been accomplished by treatment of 3‐benzylchromones 1–5, 3‐benzylflavones 6–12 and their 4‐thio analogues 25–29 with hydrazine hydrate in hot pyridine. A ...
plausible reaction mechanism for the formation of pyrazoles 13–24 is discussed. A 1H NMR study in D6DMSO allowed the presence of both pyrazole annular tautomers to be observed, due to the presence of intramolecular hydrogen bonds in each tautomer (OH‐‐N and NH‐‐O). GIAO/B3LYP/6‐311++G** calculations were carried out on some model pyrazoles to provide a theoretical basis for the NMR experimental observations.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)
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