Process for the preparation of 2-(arylamino)-3-carboxy-9(10H)-ac

Details Process for the preparation of 2-(arylamino)-3-carboxy-9(10H)-ac Process for the preparation of 2-(arylamino)-3-carboxy-9(10H)-ac

1988-10-06

1990-06-26

Rivers, Diana G.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

546 49, C07D21908

Patent

active

049373455

ABSTRACT:
A process for the preparation of 2-(arylamino)-3-carboxy-9(10H)-acridones of the formula A ##STR1## in which R and R' represent hydrogen, fluorine, chlorine or bromine atoms, alkyl(C.sub.1 -C.sub.4)-, oxalkyl(C.sub.1 -C.sub.4)- or carbonamide groups and x and y denote integers from 1 to 4, by cyclizing 2,5-diarylaminoterephthalic acids of the formula D ##STR2## in which R, R', x and y have the meanings mentioned previously, in a 5- to 15-fold amount by weight of polyphosphoric acid (P.sub.4 O.sub.10 content 80 to about 85%) or of an acidic polyphosphate (P.sub.4 O.sub.10 contents 75 to about 85%) as a water-abstracting agent at about 60.degree. C. to about 100.degree. C.

REFERENCES:
patent: 3257405 (1966-06-01), Gerson et al.
patent: 3342823 (1967-09-01), Dien et al.
patent: 4544746 (1985-10-01), Holtje

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