Some New 2-Amino-4-(N-substituted-1H- indol - 3-yl) thiophene-3-carbonitriles and their Antimicrobial Properties | ||||
| Egyptian Journal of Chemistry | ||||
| Article 3, Volume 55, Issue 3, June 2012, Page 239-258 PDF (587.81 K) | ||||
| DOI: 10.21608/ejchem.2012.1153 | ||||
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| Abstract | ||||
| ANOVEL series of 2-amino-4-(N-substituted-1H-indol-3-yl) thiophene-3-carbonitriles (3a-f) were prepared via reaction of 2-(1-(N-substituted -1H-indol-3-yl) ethylidene) malononitriles (2a-f) with sulfur (Gewald reaction). Reaction of 3a-f with formic acid, formamide or malononitrile led to the formation of fused thieno [2,3-d] pyrimidin-4(3H)-ones (6a-f) thieno[2,3-d] pyrimidin-4-amines (7a-f) and thieno[2,3-d] pyridine-3-carbonitriles (8a-f), respectively. On the other hand, a series of 2-(2-(4-nitrophenyl)-4-oxothiazolidin-3-yl)-4-(N-substituted-1H-indol-3-yl) thiophene-3-carbonitriles (10a-f) and N-3- [3-cyano-4-(N-substituted-1H-indol-3-yl)- (2-thienyl) -4-oxo-2- imino thiazolidinylidenes (12a-f), were prepared via reaction of Schiff bases 9a-f with thioglycollic acid or reaction of chloroacetamids 11a-f with potassium thiocyanate, respectively. Moreover, reaction of 3a-f with ethylenediamine yielded 3-(4,5-dihydro-1H-imidazol-2-yl)-4-(N-substituted-1H-indol-3yl) thiophen-2-amines (13a-f). The antimicrobial activity of the newly synthesized compounds revealed that, 2-(2-(naphthalene-1-yl)diazenyl)-4-(N-substituted-1H-indol-3-yl)thiophene-3-carbonitriles (4a-f) showed potent inhibition of 25-33 and 18-26mm at a dose of 20 and 10 μg per disc, respectively towards Aspergillus fumigatus compared to reference drug cycloheximide. | ||||
| Keywords | ||||
| ndole; 2-Aminothiophene-3-carbonitriles; 3-d] pyrimidine; Thieno [2; 3-d] pyridine; Thiazolidine and Antimicrobial activity | ||||
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