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- W4239829128 abstract "Treatment of 2,3-dichloroquinoxalines with 2-amino-6-picoline-3-thiol gave a mixture of 2,3-bis(2-amino-6-picolinyl-3-thio)quinoxalines (16, R = H, CI) and 2,3-bis (N,N-dimethylamino)quinoxalines (15, R = H, CI) separated by fractional crystallization. A similar reaction of 3-amino-6-methoxypyridine-2(1H)-thione (9) with 4,5-dichloropyridazin-3(2H)-one (21) gave 4-chloro-5-(3-amino-6-methoxypyridyl-2-thio)pyridazin-3(2H)-one (22). Concentrated hydrochloric acid-catalysed cyclization of 22 gave the non-rearranged 7-methoxy-2,3,6-triazaphenothiazin-1(2H)-one. The action of compound 22 in refluxing glacial acetic acid gave, on the other hand, 7-methoxy-2,3,6-triazaphenothiazin-4(3H)-one via a Smiles rearrangement. These cyclized compounds are the first known derivatives of the new 2,3,6-triazaphenothiazine ring system." @default.
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- W4239829128 date "1983-01-01" @default.
- W4239829128 modified "2023-09-28" @default.
- W4239829128 title "Synthesis of analogues of the 2,3,6,-triazaphenothiazine ring system" @default.
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- W4239829128 doi "https://doi.org/10.1002/jhet.5570200141" @default.
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