Transformations of the pyrido[1,2-a]pyrazine ring system into imidazo[1,2-a]pyridines, imidazo[1,2-a]pyrimidines and 2-oxa-6a, 10c-diazaaceanthrylenes

Journal of Heterocyclic Chemistry

Volumn 33, Issue 3, 1996, Pages 639-642

  Kolar, Patrik ^a   Pizzioli, Alessandro ^b   Tišler, Miha ^a  

^a UNIVERSITY OF LJUBLJANA   (Slovenia)

^b UNIVERSITY OF TRIESTE   (Italy)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0009930442     PISSN: 0022152X     EISSN: None     Source Type: Journal    
DOI: 10.1002/jhet.5570330319     Document Type: Article

References (25)

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22. When the enamine 2 is heated under reflux in benzene, the anticippated ethyl (1-methoxycarbonyl-4-oxo-4H-pyrido[1,2-a]pyrazin-3-yl)acetate is formed in only 25% yield [2].
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24. 13C nmr spectra could not be recorded because of the insolubility of this compound in common nmr solvents.
25. Only the chemical shifts for the predominanting geometrical isomer are given.