Interactions between [AuX4]− (X = Cl, CN) and cytosine and guanine model nucleobases: salt formation with (hemi-) protonated bases, coordination, and oxidative degradation of guanine
摘要:
Complexes of composition AuCl3L with L= 1,9-dimethylguanine (1,9-DimeG) (1), 2-amino-6-methoxy-9-methylpurine ((OMe)-Me-6-9-MeG) (2), 9-methylguanine (9-MeGH) (3), and 9-ethylguanine (9-EtGH) (4) were prepared from Na[AuCl4] or H[AuCl4] and L in water at pH 3.2 +/- 0.5. The X-ray crystal structures of 1 and 2 were determined. In both complexes, Au(III) binding is via N(7) of the purine ring. The coordination sphere of Au(III) is completed by three Cl ligands in a square plane and a weaker intermolecular contact with an adjacent molecule (Au ... Cl, 3.59(5) Angstrom (1) and 3.48(1) Angstrom (2)), thereby making each Au atom approximately square-pyramidal. In addition, three salts containing the fully or hemiprotonated model nucleobases 7,9-dimethylguanine (7,9-DimeGH), 9-MeGH and 1-methylcytosine (1-MeC) were X-ray structurally characterized: [7,9-DimeGH] [AuCl4] (5), [(9-MeGH(2)) . (9-MeGH) ] [Au(CN)(4)] (6), and [ ( 1-MeCH) . (1-MeC) ] [Au(CN)(4)] . 2H(2)O (7). Although poorly soluble in water, compounds 1-4 redissolve in a slow process that takes weeks to months with destruction of the purine skeleton and formation of guanidinium and parabanic acid derivatives as well as other products, depending upon the conditions applied. (C) 1998 Elsevier Science S.A. All rights reserved.
[EN] ECTONUCLEOTIDASE INHIBITORS AND METHODS OF USE THEREOF<br/>[FR] INHIBITEURS D'ÉCTONUCLÉOTIDASE ET LEURS MÉTHODES D'UTILISATION
申请人:CALITHERA BIOSCIENCES INC
公开号:WO2018119284A1
公开(公告)日:2018-06-28
The invention relates to novel heterocyclic compounds and pharmaceutical preparations thereof. The invention further relates to methods of treating or preventing cancer using the novel heterocyclic compounds of the invention.
HgCl2 coordination to guanine derivatives: structural and spectroscopic studies on the interactions with 9-ethylguanine, 1,9-dimethylguanine and 2-amino-6-methoxy-9-methylpurine (6,9-dimethylguanine)
作者:Stephan Menzer、Edda C. Hillgeris、Bernhard Lippert
DOI:10.1016/s0020-1693(00)85606-6
日期:1993.9
955(2), b=17.176(6), c=21.829(9) A, Z=4) are reported. Binding of HgCl2 is through N7 of the purine bases. In 1 discrete molecules are formed, while 2 is a linear polymer with (HgCl)n chains to which the guanine bases and chloro ligands are coordinated. The solution behavior is characterized by a rapid ligand exchange and low complex formation constants, log β1=0.4 (1), 1.3 (1:1 adduct of 2) and 1.0 [HgCl2·9-EtGH]
COMPOSITION COMPRISING PURINE DERIVATIVES OR SALT THEREOF FOR PREVENTING OR TREATING ATOPIC DERMATITIS
申请人:Daewoong Co., Ltd.
公开号:EP2837382A1
公开(公告)日:2015-02-18
The present invention provides a pharmaceutical composition for preventing or treating atopic dermatitis comprising 2-amino-1,9-dimethylpurin-6-one or its pharmaceutically acceptable salt as an active ingredient. And also, the present invention provides a cosmetic composition for improving atopic dermatitis comprising 2-amino-1,9-dimethylpurin-6-one or its pharmaceutically acceptable salt; and a food (i.e., a functional food) for preventing or improving atopic dermatitis comprising 2-amino-1,9-dimethylpurin-6-one or its pharmaceutically acceptable salt.
Chemical reactivity of alkylguanines. I. Methylation of O6-methylguanine derivatives
作者:Kohfuku Kohda、Kunihisa Baba、Yutaka Kawazoe
DOI:10.1016/s0040-4039(01)91353-x
日期:1987.1
Photoemission properties of methyl-substituted guanines: photoelectron and fluorescence investigations of 1,9-dimethylguanine, O6,9-dimethylguanine, and 9-methylguanine
作者:Pierre R. LeBreton、Xu Yang、Shigeyuki Urano、Sharon Fetzer、Min Yu、Nelson J. Leonard、Shiv Kumar