Abstract
Derivatives of [1]benzothieno[2.3-c]pyrazole, a new heterocyclic ring system, were synthesized by 1.3-dipolar cycloadditions: benzo[b]thiophene-1.1-dioxide and derivatives thereof reacted with diazomethane and diazoethane to yield substituted [1]benzothieno[2.3-c]pyrazolines. A similar reaction with ethyl diazoacetate gave the corresponding cyclopropa[b][1]benzothiophene-2.2-dioxide derivative.
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Wir danken Herrn Dr.L. Otruba aus unserem Arbeitskreis für die Ausführung der Reaktionen zu den Verbindungen15 bis18.
G. M. Badger, H. J. Rodda undJ. M. Sasse, J. Chem. Soc. [London]1958, 4777.
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Sauter, F., Büyük, G. Synthese von [1]Benzothieno[2,3—c]pyrazol-Derivaten. Monatshefte für Chemie 105, 550–557 (1974). https://doi.org/10.1007/BF00912607
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DOI: https://doi.org/10.1007/BF00912607