Synthesis and Properties of Some New 1,4-Dihydrothieno[3,2-e][1,2,4]triazepin-5-ones

Salim S. Sabri, Naser S. El-Abadla, Mustafa M. El-Abadelah, Wolfgang Voelter
2006 Zeitschrift für Naturforschung. B, A journal of chemical sciences  
Methyl 3-aminothiophene-2-carboxylate reacts readily, in the presence of triethylamine, with hydrazonoyl chlorides (7a - c) to afford good yields of the corresponding N-arylamidrazones (8a - c). The latter acyclic adducts undergo, in the presence of t-BuOK/t-BuOH, cyclocondensation accompanied by elimination of the acetyl group present in 8, to deliver the respective thieno-1,3,4-triazepin- 5-ones 10a - c.
doi:10.1515/znb-2006-0113 fatcat:kicbiqsklbekvasw7e3e7pu5ou