Synthetic chemotherapeutic agents. IV. Synthesis of 3-substituted thiazolo(5,4-f)quinoline derivatives.

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Abstract
A method of synthesizing for 3,6-disubstituted 2,9-dioxo-2,3,6,9-tetrahydrothiazolo[5,4-f]quinoline-8-carboxylic acids via the thiazolium salts was studied and was practical. The reactions of the thiazolium salt with various nucleophilic reagents afforded several new derivatives. Gould-Jacobs reaction of the benzothiazole-2-ones and benzothiazole-2-thione derivatives were also carried out.