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- W2055269792 abstract "This paper describes the unequivocal synthesis of three new heterocycles: 2, 3, 6-triazaphenothiazine (7) and 2, 3, 6, 9-tetraazaphenothiazine (18), both parents of the respective ring systems and the 6, 8-dihydro-7, 9-di-oxo derivative of 2, 3, 6, 8-tetrahydrophenothiazine (12). These compounds were obtained by base-catalysed condensation of 4, 5-dichloropyridazine (8) with the appropriate o-amino-heterocyclic thiols 9, 11, 16. In contrast, reaction of 2, 3, 5-trichloropyrazine (20) with 4, 6-diaminopyrimidine-5-thiol (21) and 2-amino-6-picoline-3-thiol (28) gave 5-chloro-2, 3-bis(diaminopyrimidinyl-5-thio)pyrazine (33) and 5-chloro-2, 3-bis(2-amino-6-picolinyl-3-thio)pyrazine (29), respectively. Chloropyrazine (34) and 3-aminopyridine-2(1H)-thione (9) followed the latter reaction path to 2-(3-amino-2-pyridyl) pyrazinyl sulfide (35) in good yields. Structural assignments were based on their infrared, ultraviolet, nmr and mass spectra." @default.
- W2055269792 created "2016-06-24" @default.
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- W2055269792 date "1983-07-01" @default.
- W2055269792 modified "2023-09-27" @default.
- W2055269792 title "Unequivocal synthesis of 2,3,6-triazaphenothiazine and two new tetraazaphenothiazine heterocycles" @default.
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- W2055269792 doi "https://doi.org/10.1002/jhet.5570200441" @default.
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