Purine is a nitrogen-containing heterocyclic compound, colorless needle crystal or white powder, melting point 216 ~ 217 ° C (rapid heating part sublimation), soluble in water, UV λ max 260 nm in pH = 1 aqueous solution, in pH = 7 aqueous solution The medium UV λ max 263 nm is insoluble in an organic solvent and forms a salt with an acid or a base, respectively. Due to its presence of conjugated double bonds, Purine exhibits aromaticity, is quite stable, and has a strong UV absorption spectrum. Purine body does not exist in nature, its derivatives are widely found in nature such as adenine, guanine is an important component of nucleic acids, some alkaloids such as caffeine, theobromine, some animal excrement such as uric acid, are Purine Class of compounds. Further, such clinical drugs as 6-mercaptopurine, pyrazolidine and the like are anthracene derivatives.
Purine is a condensate of a pyrimidine ring and an imidazole ring. Since the two rings interact with each other, the basicity of ruthenium is between pyrimidine and imidazole, and the electrophilic substitution mainly occurs in the 8-position and is not easy to occur. The nucleophilic reaction occurs at the 2-position and the 6-position.
Scopolamine is a derivative of the parent quinone. The various RNAs and DNA molecules contain the same two purine bases, adenine and guanine. In addition, there are freely available purine bases in the body, such as jaundice, hypoxanthine, uric acid and the like. The former two are intermediates of nucleic acid catabolism, the latter being one of the final products of nucleic acid catabolism, and the content of urine is more.
Purine is a nitrogen-containing heterocyclic compound
