Abstract The synthesis of 4, 5-dihydro-7-phenylthiazolo [2, 3-c][1, 2, 4] triazepin-3 (2H)-one (4) from 2-propenoic acid 2-(4-phenyl-2-thiazolyl) hydrazide (14), is reported. A synthesis of 4 which was reported earlier by Mahajan, Sondhi and Ralhan (9), from 3-chloropropanoic ...
![7-phenyl-4,5-dihydro-2H-[1,3]thiazolo[2,3-c][1,2,4]triazepin-3-one Structure](https://image.chemsrc.com/caspic/460/61323-72-6.png)
![7,8-Dihydro-3-phenylthiazolo[3,2-b][1,2,4]triazepin-6(5H)-one Structure](https://image.chemsrc.com/caspic/257/84253-09-8.png)