Synthesis 2002(6): 0723-0725
DOI: 10.1055/s-2002-25771
SHORTPAPER
© Georg Thieme Verlag Stuttgart · New York

Preparation of New Cyclic Quaterbenzoxazole and -Imidazole Derivatives

Erich Tauer*
Max-Planck-Institut für biophysikalische Chemie, Abteilung Spektroskopie und Photochemische Kinetik, 37070 Göttingen, Germany
Fax: +49(551)2011501; e-Mail: idreger@gwdg.de;
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Publikationsverlauf

Received 12 January 2001
Publikationsdatum:
26. April 2002 (online)

Abstract

The new cyclic quaterbenzoxazole 5 and -imidazole 8 have been synthesized by cyclization of 3-amino-2-hydroxybenzamide (4) and the ammonium salt of 2,3-diaminobenzoic acid (7), respectively, with polyphosphoric acid. Both compounds represent a new heterocyclic nine ring system, which can be built up from four identical (or different) benzo-x-azoles in a cyclic arrangement.