Dimethylformamide Catalyzed Synthesis of Novel Heterocycles—Their Characterization and Antimicrobial Evaluation

Indandione 1 was brominated to yield 2‐bromoIndandione 2 , which further reacted with substituted thiocarbamides, carbamides, 2‐aminothiophenols, 2‐aminophenol, and triazole to furnished 3‐substituted aniline‐2‐thia‐4‐aza‐6,7‐benzo‐8‐oxo‐bicyclo[3.3.0]‐1(5),3‐octadiene 3 , 3‐substituted aniline‐2‐oxa‐4‐aza‐6,7‐benzo‐8‐oxo‐bicyclo[3.3.0]‐1(5),3‐octadiene 4 , 2‐Thia‐5‐aza‐9‐oxo‐3,4‐(3′‐substituted) benzo‐7,8‐benzo‐bicyclo[4.3.0]‐1(6) nonene 5 , 2‐oxa‐5‐aza‐9‐oxo‐(3, 4)‐(7,8)‐dibenzo‐bicyclo[4.3.0]‐1(6) nonene 6 , 3′‐substituted‐(1′,2′,4′)triazolo[5,6‐b][indeno(2,3‐e)]‐1,3,4‐thiadiazine 7 , respectively. The structures of compounds were elucidated on the basis of spectral techniques, further the representative compounds were screened for their antimicrobial activity .