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- W2168533747 abstract "Pyrimidines carrying an ω-alkyne side-chain -XCH2CH2CCH (X=O,N,S,SO,SO2) at the 2 or 5 position undergo intramolecular inverse electron demand Diels-Alder reactions across the C-2 and C-5 positions; elimination of hydrogen (or alkyl) cyanide from the intermediate adducts leads to condensed pyridines. The influence of the hetero atom (X) in the dienophilic side-chain and that of substituents in the pyrimidine ring on the reactivity is discussed." @default.
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- W2168533747 date "1989-01-01" @default.
- W2168533747 modified "2023-10-09" @default.
- W2168533747 title "Ring-transformations of pyrimidines by intramolecular diels-alder reactions. Synthesis of annelated fyridines" @default.
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- W2168533747 doi "https://doi.org/10.1016/0040-4020(89)80111-5" @default.
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