Okafor, Charles O. published the artcileThe first branched benzoxazinophenothiazine ring system and its aza analogs, Application of 5-Chlorothiazolo[5,4-b]pyridin-2-amine, the publication is Tetrahedron (1988), 44(4), 1187-94, database is CAplus.
The synthesis of a branched benzoxazinophenothiazine heterocycle is described. The parent compound benzo[a][1,4]-benzoxazino[3,2-c]phenothiazine (I), was obtained from 2,3-dichloro-1,4-naphthoquinone, 2-aminophenol and 2-(amino)thiophenol. Monoaza-, diaza- and triaza- analogs of this novel heterocycle were also synthesized. The parent compounds, 16-oxa-15-thia-4,5,10-triazabenzo[h]pentaphene and 16-oxa-15-thia-4,5,10,14-tetraazabenzo[h]pentaphene were also synthesized as well as 4-amino-16-oxa-15-thia-4,5,10,12,14-pentaazabenzo[h]pentaphene. They are intensely colored high-melting solids suitable for application as pigments. Their ease of reduction with Na2S2O4 and the ready oxidation of the reduced compounds to the quinoid forms by atm. oxygen suggest their applicability also as vat dyes.
Tetrahedron published new progress about 31784-71-1. 31784-71-1 belongs to thiazole, auxiliary class Other Aromatic Heterocyclic,Chloride,Amine, name is 5-Chlorothiazolo[5,4-b]pyridin-2-amine, and the molecular formula is C6H4ClN3S, Application of 5-Chlorothiazolo[5,4-b]pyridin-2-amine.
Referemce:
https://pubchem.ncbi.nlm.nih.gov/compound/thiazole,
Thiazole | chemical compound | Britannica