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• W2001399266 abstract "Novel method of N-dealkylating quinobenzothiazinium salts 2, promoted by reaction with benzimidazole, led to a series of new azaphenothiazine derivatives having 12(H)-quino[3,4-b][1,4] benzothiazine 4 structure. Reaction of compounds 4 in an alkaline milieu with alkylating agents occur as N-alkylation of the thiazine nitrogen and yields quinobenzothiazine derivatives 7. In vitro antiproliferative activity of compounds 4 and 7 was tested using two cancer cell lines (SNB-19 and C-32) and cisplatin as a reference. Most of the studied azaphenothiazine derivatives showed activity against both cell lines investigated (5.6–12.4 μg/ml concentration range tested). Compounds 4(b–e) containing a halogen atom or methyl group at the 9-position of the quinobenzothiazine ring show activity in the tested concentration range only against C-32 cell line. Compound 4f with methyl group in 11-position of quinobenzothiazine ring lacked activity against either cell line. The presence of additional aminoalkyl substituents at the thiazine nitrogen atom in compounds 7 increases their activity against both examined cell lines, when compared to compounds 4." @default.
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• W2001399266 date "2012-12-24" @default.
• W2001399266 modified "2023-10-12" @default.
• W2001399266 title "Synthesis and in vitro antiproliferative activity of novel 12(H)-quino[3,4-b][1,4]benzothiazine derivatives" @default.
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• W2001399266 doi "https://doi.org/10.1007/s00044-012-0384-4" @default.
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