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- W2084508713 abstract "5-Chloropyrido[3,4-b]pyrazines were prepared from 1,2-dicarbonyl compounds and 2-chloro-3,4-diaminopyridine. Condensation of unsymmetrical glyoxals provided a mixture of two regiosiomers with 2-substituted pyrido[3,4-b]-pyrazines as the major product. The regiochemistry was unambiguously assigned by 2D-NMR experiments. C-C- and C-N coupling reactions of 5-chloro or 5-oxo intermediates afforded the corresponding C-5 or N-6 substituted derivatives." @default.
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- W2084508713 date "2003-08-05" @default.
- W2084508713 modified "2023-09-27" @default.
- W2084508713 title "Pyrido[3,4-b]pyrazines. A New Application of 2-Chloro-3,4-diaminopyridine." @default.
- W2084508713 cites W2952091978 @default.
- W2084508713 doi "https://doi.org/10.1002/chin.200331182" @default.
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