title: Stabilities of 7-alkylguanosines and 7-deoxyguanosines formed by phosphoramide mustard and nitrogen mustard.
abstract: 7-Alkylguanosine and 7-alkyldeoxyguanosine were prepared from phosphoramide mustard and nitrogen mustard in nonaqueous conditions. The guanosine products were N-(2-chloroethyl)-N-[2-(7-guanosinyl)ethyl] phosphorodiamidic acid, and N-(2-chloroethyl)-N-[2-(7-guanosinyl)ethyl]methylamine, respectively. These were also formed in aqueous reactions but they rapidly underwent secondary reactions. The half-life of the phosphoramide mustard-guanosine adduct was 3.1 h (37 degrees C, pH 7.4) and that of the nitrogen mustard adduct 1 h (25 degrees C, pH 7.4), as determined by HPLC. The half-lives of the respective adducts for imidazole ring-opening were 9.5 h and 0.78 h (37 degrees C, pH 7.4). The respective deoxyguanosine derivatives depurinated with half-lives of 8.5 h and 1.6 h (25 degrees C, pH 4.2). The mustard adducts are notably more labile than simple alkyl substituted guanosines and deoxyguanosines.
mesh_terms: D000478:Alkylation; D055598:Chemical Phenomena; D002621:Chemistry; D002851:Chromatography, High Pressure Liquid; D003849:Deoxyguanosine / Q000031:analogs & derivatives*; D004355:Drug Stability; D006151:Guanosine / Q000031:analogs & derivatives*; D006207:Half-Life; D007093:Imidazoles; D007700:Kinetics; D008466:Mechlorethamine; D010752:Phosphoramide Mustards; D011687:Purines
chemical_list: D007093:Imidazoles; D010752:Phosphoramide Mustards; D011687:Purines; C030090:phosphoramide mustard; D006151:Guanosine; D008466:Mechlorethamine; D003849:Deoxyguanosine