Abstract 4-Benzoyl-5-phenylthiophene-2, 3-dione (1) reacts with o-phenylendiamine to give the quinoxaline derivative 2 which cyclizes either to the furo [2, 3-b] quinoxaline 4 or to the thieno [2, 3-b] quinoxaline 5 depending on the reaction conditions. On the other hand, the pyrrol-2, 3-diones 6 and o-phenylendiamine combine yielding the pyrrolidino [2, 3-b][1, 5] benzodiazepine derivatives 7. The structures of all compounds were confirmed by IR and ...
![phenyl-(2-phenylfuro[3,2-b]quinoxalin-3-yl)methanone Structure](https://image.chemsrc.com/caspic/106/61290-02-6.png)
