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- W2054388628 abstract "2-Aminopyrido[3,4-e][1,3]thiazin-4-one 4 werden aus 4-Hydroxy-3-pyridincarbonsaureestern 1 uber 4-Chlor-3-pyridincarbonsaureester 2 mit Thioharnstoff erhalten. 1,3-Thiazin-4-one 4 werden durch Alkali sehr leicht zu Acylharnstoffen 5 gespalten. Mit Carbonsaurechloriden und mit Isocyanaten reagieren die Verbindungen 4 am Thiazinonring-Stickstoff zu 3-Acylpyrido[3,4-e]-thiazinonen 7, deren Struktur aus den Massenspektren abgeleitet wird. Chlorameisensaurederivate in N,N-Dimethylformamid uberfuhren dagegen 4a unter Angriff auf den exocyclischen Stickstoff in das Dimethylformamidin 9.Heterocycles by Annelation to 4-Pyridinols, III1) — 2-Aminopyrido[3,4-e][1,3]thiazin-4-ones12-Aminopyrido[3,4-e][1,3]thiazin-4-ones 4 are obtained from 4-hydroxy-3-pyridinecarboxylic esters 1 via 4-chloro-3-pyridinecarboxylic esters 2 and reaction of the latter ones with thiourea. The 1,3-thiazin-4-one ring in 4 is very easily cleaved by alkali to give acylureas 5. Carboxylic chlorides and isocyanates react with compounds 4 at the thiazinone ring nitrogen to yield 3-acylpyrido[3,4-e]thiazinones 7, the structure of which is deduced from mass spectra. On the other hand chloroformic acid derivatives in N,N-dimethylformamide attack the exocyclic nitrogen to transform 4a into the dimethylformamidine 9." @default.
- W2054388628 created "2016-06-24" @default.
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- W2054388628 date "1980-09-26" @default.
- W2054388628 modified "2023-09-27" @default.
- W2054388628 title "Heterocyclen durch Anellierung an 4-Pyridinole, III. 2-Aminopyrido[3,4-e][1,3]thiazin-4-one" @default.
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- W2054388628 doi "https://doi.org/10.1002/jlac.198019800908" @default.
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