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- W2118132147 abstract "Reaction of 7-phenyl, 7-p-methoxyphenyl, 7-t-butyl- and 6,7-diphenylpteridine with ethylamine and t-butylamine in the presence of potassium permanganate leads to the introduction of the ethylamino or t-butylamino group at C-4 in the above-mentioned pteridines. In the reaction of ethylamine/potassium permanganate besides the 4-(ethylamino)pteridine derivatives 2-amino-3-formytpyrazines are obtained as side-products. In the reaction with t-butylamine/potassium permanganate the corresponding pteridin-4-ones are obtained as by-products. The 1H nmr spectroscopic studies have revealed that at room temperature ethylamine easily gives a σ-adduct at C-4, yielding a 4-(ethylamino)-3,4-dihydropteridine derivative. t-Butylamine, however, only gives with the pteridines addition at C-4 at low temperature, i.e. at −40°. This adduct dissociates at room temperature. n-Propylamine and n-butylamine show the same behavior as ethylamine." @default.
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- W2118132147 date "1986-05-01" @default.
- W2118132147 modified "2023-10-12" @default.
- W2118132147 title "Alkylamination of pteridines by primary alkylamines - potassium permanganate" @default.
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- W2118132147 doi "https://doi.org/10.1002/jhet.5570230336" @default.
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