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- W2074593966 abstract "Synthesis of 4‐Alkylcytosine Nucleosides and Evaluation of Cytostatic Activity in the L1210 Murine Leukemia 4‐Alkylcytosine nucleosides 2 were prepared by nucleophilic substitution of the 4‐(1, 2, 4‐triazol‐1‐yl) residue of uracil nucleoside derivatives 1 using different amino compounds. The antitumor activity against L1210 murine leukemia of fifteen 4‐alkylcytosine nucleosides dissolved in buffer or incorporated into liposomes was tested. Liposomal 1‐(β‐ D ‐arabinofuranosyl)‐4‐octadecylamino‐2(1 H ) ‐pyrimidinone ( 2d ) having the highest activity gave an increase of life span (ILS) of 706% and 6/6 survivors at 400 μmol/kg. The structurally related and well‐known antitumor drug 1‐(β‐ D ‐arabinofuranosyl)cytosine (araC) dissolved in buffer gave only 179% ILS and 0/6 survivors under corresponding conditions. Derivatives 2a‐c and 2e‐f having shorter or longer alkyl chains were less active. All the other derivatives showed no antitumor effect. The activity of the 4‐alkylcytosine nucleoside was also lost, when the arabinose residue was replaced by ribose or deoxyribose. magnified image" @default.
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- W2074593966 title "Synthese von 4-Alkylcytosinnucleosiden und deren cytostatische Wirkung im L1210 Leukämiemodell der Maus" @default.
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- W2074593966 doi "https://doi.org/10.1002/jlac.15619940504" @default.
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