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The synthesis and characteristic absorption spectra of 2,3,8-trisubstituted-indeno[2,1-b]thiophene compounds 5, 6 and 7 were reported. Cyclization of 3-dicyanovinyl-indan-1-one 3 with sulfur gave 2-amino-8-oxo-8H-indeno[2,1-b]thiophene-3-carbo-nitrile compound 5. The reaction of compound 5 with malononitrile and with ethyl cyanoacetate gave the indeno[2,1-b]thiophene derivatives 6 and 7, respectively...
Condensation of 3-dicyanovinylindan-1-one 3 with arylamines 5a–5c afforded 2-[3-(substituted-amino)-inden-1-ylidene]-malononitriles 7a–7c, which were converted to 2-amino-indeno[2,1-b]thiophene 8a–8c using the Gewald reaction. Cyclization of ethyl(1-indanylidene)-cyanoacetate 4 with elemental sulfur gave 2-amino-8H-indeno[2,1-b]thiophene-3-carboxylic acid ethyl ester 9. Acetylation of 9 with acetic...
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