Heterocyclisch [c]??anellierte cumarine aus 4??azido??3??cumarincarbaldehyden

T Steinführer, A Hantschmann…

Index: Steinfuehrer, Thorsten; Hantschmann, Achim; Pietsch, Michael; Weissenfels, Manfred Liebigs Annalen der Chemie, 1992 , # 1 p. 23 - 28

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Citation Number: 17

Abstract

4-Azido-3-coumarincarbaldehydes 2a-d are useful starting superior to the corresponding 4- chloro-3-coumarincarbalde-materials for syntheses of a variety of 3, 4-disubstituted cou- hydes la-d, from which they were prepared. An improved marins as well as heterocyclic [c]- fused coumarins, eg isox-method for the preparation of la-d from 4-hydroxyazoles, pyrazoles and 1, 5-diazepines, under mild conditions. In coumarins is described. these reactions, 2 ...