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An effective method for the synthesis of N-ethyl-2,1,3-benzoselenadiazolamines 11 and 15 has been described. Modified Gould-Jacobs reaction of N-ethylbenzoselenadiazol-4-amine 15 provided 9-ethylselenadiazoloquinolone derivatives 2 and 19 in high yields. Acid-promoted ring closure of enamine 18c unexpectedly afforded completely deacetylated product - 9- ethylselenadiazoloquinolone 2. Identical product was obtained by ethylation of selenadiazolo(3,4-h)quinolone 1 and by basic hydrolysis of ethyl ester 19b followed by thermal decarboxylation of the corresponding acid 20 .

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Synthesis of 9-ethyl[1,2,5]selenadiazolo[3,4-h]quinolones by the application of modified Gould-Jacobs reaction to N-ethyl-2,1,3-benzoselenadiazol-4-amine