Catalytically reductive ring closure for 1-acylamino-3,4-phthalo

Details Catalytically reductive ring closure for 1-acylamino-3,4-phthalo Catalytically reductive ring closure for 1-acylamino-3,4-phthalo

1982-01-19

1983-05-17

Daus, Donald G.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

106288Q, 260377, C09B 1500

Patent

active

043841198

ABSTRACT:
The present invention relates to an advantageous novel process for producing 1-acylamino-3,4-phthaloylacridones by a hydrogenating ring-closure reaction of 1-acylamino-4-anilidoanthraquinone-2'-carboxylic acid esters.
The ring-closure reaction according to the invention to the acridone ring is performed under mild conditions, with regard to temperature and alkalinity of the reaction medium, with the use of a hydrogenating catalyst. The first step to effect the ester formation can be carried out, as a single-vessel reaction, with the use of a polar solvent as the reaction medium, and of an alkylphosphoric acid dialkyl ester as the esterifying agent.

REFERENCES:
patent: 4258190 (1981-03-01), Taggi

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