Preparation of new cyclic quaterbenzoxazole and -imidazole derivatives

Tauer, E.

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Preparation of new cyclic quaterbenzoxazole and -imidazole derivatives

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Tauer, E.
Max Planck Society;

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Tauer, E. (2002). Preparation of new cyclic quaterbenzoxazole and -imidazole derivatives. Synthesis-Stuttgart, (6), 723-725. Retrieved from https://www.thieme-connect.de/ejournals/pdf/synthesis/doi/10.1055/s-2002-25771.pdf.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0012-F3D6-0

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.