One-pot, procedure for the preparation of some thiazino[2,3-b]quinoxaline derivatives was written by Bakavoli, Mehdi;Eshghi, Hossein;Azizollahi, Hamid;Saberi, Sattar;Bazrafshan, Faezeh. And the article was included in Journal of Chemical Research in 2014.SDS of cas: 51395-52-9 This article mentions the following:
An efficient and convenient synthesis of new thiazino[2,3-b]quinoxaline derivatives I (R = CH3, C6H5, 4-MeC6H4, etc.) has been developed by employing a one-pot cyclocondensation of several α-haloketones and 3-aminoquinoxaline-2-thiol in acetic acid. A similar reaction with 4-bromo-3-methyl-4,5-dihydro-1H-5-pyrazolone gave a new heterocyclic system, 3-methyl-1,4-dihydropyrazolo[4′,3′:5,6][1,4]thiazino[2,3-b]quinoxaline. In the experiment, the researchers used many compounds, for example, 4-Bromo-3-methyl-1H-pyrazol-5(4H)-one (cas: 51395-52-9SDS of cas: 51395-52-9).
4-Bromo-3-methyl-1H-pyrazol-5(4H)-one (cas: 51395-52-9) belongs to pyrazole derivatives. Pyrazoles, a five-membered heterocycle containing two adjacent nitrogen atoms, are the core structures found in a number of molecules that possess a wide range of pharmaceutical and agricultural activities. Pyrazole rings have been used as core components of several leading non-steroidal anti-inflammatory drugs (NSAIDs) and antihypertensive drugs. It has also been found to be useful as a bifunctional ligand for metal catalysis.SDS of cas: 51395-52-9
Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics