Process for the preparation of 3-hydroxy-N-benzimidazolon-5-yl-2

Details Process for the preparation of 3-hydroxy-N-benzimidazolon-5-yl-2 Process for the preparation of 3-hydroxy-N-benzimidazolon-5-yl-2

1995-11-16

1998-05-26

Richter, Johann

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D23526

Patent

active

057567573

ABSTRACT:
The invention relates to a process for the preparation of 3-hydroxy-N-benzimidazolon-5-yl-2-naphthamide, which comprises reacting 5-aminobenzimidazolone and sodium carbonate in N-methylpyrrolidone with a solution of 3-hydroxy-2-naphthoyl chloride in xylene or toluene, filtering, washing with xylene or toluene, introducing the filter cake into water to which sodium carbonate has been added and steam-distilling, filtering off the residue with suction, washing and drying.

REFERENCES:
Kraska, J. et al, Dyes and Pigments 12: "Synthesis of Amides of 3-Hydroxy-2-Naphthoic Acid: Derivatives of Benzimidazolone and Benzoxazolone", pp. 57-63 (1990).
Chemical Abstract, vol. 92, No. 9, Abstract No. 76179k, p. 741, Mar. 3, 1980.
Chemical Abstract, vol. 112, No. 13, Abstract No. 118816e, p. 647, Mar. 26, 1990.
M. Vata et al, "Unkonventionelle Syntheses des 5-Amino-Benzimidazolon-(2)-naphtharylids", Revue Roumaine De Chimie, pp. 719-722, Jun. 6, 1992.

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