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Synthesis 2002(6): 0723-0725
DOI: 10.1055/s-2002-25771
DOI: 10.1055/s-2002-25771
SHORTPAPER
© Georg Thieme Verlag Stuttgart · New York
Preparation of New Cyclic Quaterbenzoxazole and -Imidazole Derivatives
Further Information
Received
12 January 2001
Publication Date:
26 April 2002 (online)
Publication History
Publication Date:
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.
Key words
heterocycles - cyclotetramerization - macrocycles - photodimerization
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