Synthesen mit 2??Diazo??1, 3??diketonen, III. Cyclokondensationen mit H??Nucleophilen

L Capuano, W Fischer, H Scheidt…

Index: Capuano,L. et al. Chemische Berichte, 1978 , vol. 111, p. 2497 - 2509

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Citation Number: 13

Abstract

Abstract Die durch thermische Wolff-Umlagerung der 2-Diazo-1, 3-diketone 1 erzeugten Acylketene 4 reagieren mit Urethanen. Harnstoffen, Amidinen bzw. einem Imidokohlensäureester durch 4+ 2-Cyclokondensation zu den Oxazinen 2, 12, 16 bzw. Pyrimidinen 13, 17; durch 2+ 2-Cyclisierung zu den β-Keto-enaminen 18. Mit Arylhydrazinen werden 4-Aryl-3-pyrazolin-5-one 6 gewonnen. In Gegenwart von Methylhydrazin bzw. ...

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