[1]Benzothieno[3,2-f]quinolinecarboxylic acids

Details [1]Benzothieno[3,2-f]quinolinecarboxylic acids [1]Benzothieno[3,2-f]quinolinecarboxylic acids

1975-08-25

1977-04-19

Daus, Donald G.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

2603305, 260332, 260485N, 260578, 424258, C07D49522

Patent

active

040187802

ABSTRACT:
4-Hydroxy[1]benzothieno[3,2-f]quinoline-2-carboxylic acids and esters thereof are prepared by the reaction of an optionally substituted 2-aminobenzothiophene with dimethyl acetylenedicarboxylate followed by ring closure. The sulfur atom of the intermediate compounds in the process can be oxidized to oxide or dioxide state, then hydrolyzed to the acids, or first hydrolyzed to the acids and then oxidized, if desired. The acids are physiologically active as anti-allergic agents in the acid form or as salts.

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