title: Nitrosoureidonucleosides.
abstract: 3-Deoxyl-1,2-O-isopropylidine-3-(3-methylureido)-alpha-D-ribofuranose (2) was converted to 1,2,5-tri-O-acetyl-3-deoxy-3-(3-acetyl-3-methylureido)-D-ribofuranose (4) and the corresponding glycosyl chloride (7). These sugars were converted to the 3-deoxy-3-(3-methylureido)-beta-D-ribofuranosyl derivatives of adenine (6c), 2-chloroadenine (6d), cytosine (6f), and uracil (6g). Nitrosation of these nucleosides gave the corresponding 3-methyl-3-nitrosoureidonucleosides 8c,d,f,g. 5'-Amino-5'-doxyadenosine (10a), 5'-amino-5'-deoxyuridine (10b), and 5'-amino-5'-deoxycytidine (10c) were all converted to the corresponding 5'-(methylureido)-5'-deoxynucleosides 15a--c by reaction with methyl isocyanate. Nitrosation of these compounds gave the methylnitrosoureidonucleosides 16a--c. These nitrosoureas, potential active-site-directed irreversible enzyme inhibitors, showed little cytotoxicity or activity against leukemia L1210 in vivo.
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000138:chemical synthesis*; D066298:In Vitro Techniques; D007939:Leukemia L1210 / Q000188:drug therapy; D009607:Nitrosourea Compounds / Q000138:chemical synthesis* / Q000494:pharmacology; D009705:Nucleosides / Q000138:chemical synthesis* / Q000494:pharmacology
chemical_list: D000970:Antineoplastic Agents; D009607:Nitrosourea Compounds; D009705:Nucleosides