81-83-4Relevant articles and documents
Independent Generation and Reactivity of 2′-Deoxyguanosin- N1-yl Radical
Zheng, Liwei,Greenberg, Marc M.
, p. 8665 - 8672 (2020)
2′-Deoxyguanosin-N1-yl radical (dG(N1-H)?) is the thermodynamically favored one-electron oxidation product of 2′-deoxyguanosine (dG), the most readily oxidized native nucleoside. dG(N1-H)? is produced by the formal dehydration of a hydroxyl radical adduct of dG as well as by deprotonation of the corresponding radical cation. dG(N1-H)? were formed as a result of the indirect and direct effects of ionizing radiation, among other DNA damaging agents. dG(N1-H)? was generated photochemically (λmax = 350 nm) from an N-aryloxy-naphthalimide precursor (3). The quantum yield for photochemical conversion of 3 is ～0.03 and decreases significantly in the presence O2, suggesting that bond scission occurs from a triplet excited state. dG is formed quantitatively in the presence of excess β-mercaptoethanol. In the absence of a reducing agent, dG(N1-H)? oxidizes 3, decreasing the dG yield to ～50%. Addition of 8-oxo-7,8-dihydro-2′-deoxyguanosine (8-oxodGuo) as a sacrificial reductant results in a quantitative yield of dG and two-electron oxidation products of 8-oxodGuo. N-Aryloxy-naphthalimide 3 is an efficient and high-yielding photochemical precursor of dG(N1-H)? that will facilitate mechanistic studies on the reactivity of this important reactive intermediate involved in DNA damage.
Novel chiral naphthalimide-cycloalkanediamine conjugates: Design, synthesis and antitumor activity
Costales, Paula,Ríos-Lombardía, Nicolás,Lorenzo-Herrero, Seila,Morís, Francisco,González-Sabín, Javier
, (2021/04/15)
A novel series of enantiopure naphthalimide-cycloalkanediamine conjugates were designed, synthetized and evaluated for in vitro cytotoxicity against human colon adenocarcinoma (LoVo), human lung adenocarcinoma (A549), human cervical carcinoma (Hela) and human promyelocytic leukemia cell lines (HL-60). The cytotoxicity of the compounds was highly dependent on size and relative stereochemistry of the cycloalkyl ring as well as length of the spacer. By contrast, any kind of enantioselection was observed for each pair of enantiomers. Flow cytometric analysis indicated that compounds 22 and 23 could effectively induce G2/M arrest in the four previous cell lines despite a mild apoptotic effect.
Cytotoxicity, anticancer, and antioxidant properties of mono and bis-naphthalimido β-lactam conjugates
Borazjani, Nassim,Behzadi, Maryam,Dadkhah Aseman, Marzieh,Jarrahpour, Aliasghar,Rad, Javad Ameri,Kianpour, Sedigheh,Iraji, Aida,Nabavizadeh, S. Masoud,Ghanbari, Mohammad Mehdi,Batta, Gyula,Turos, Edward
, p. 1355 - 1375 (2020/05/14)
This article reports the diastereoselective synthesis of some novel naphthalimido and bis-naphthalimido β-lactam derivatives and a preliminary evaluation of their anticancer properties. The reactions were completely diastereoselective, leading exclusively to the formation of cis-β-lactams 11a–l and trans-bis-β-lactams 16a–g. All of these compounds were obtained in good to excellent yields and their structures were established based on IR, 1H NMR, 13C NMR spectral data, and elemental analysis. Each of the β-lactams was screened for antioxidant and anticancer activities. Our results showed that all the compounds lacked cytotoxicity against HepG2 cells, whereas 16a and 16b exhibited excellent anticancer activity with IC50 values below 191.57 μM on MCF-7 cell line and also, bis-β-lactams 16a–g showed excellent antitumor activity against the TC-1 cell line. Antioxidant experiments of 16a–d by the diphenylpicrylhydrazyl (DPPH) assay showed IC50 values ranging from 7 to 32.3 μg/ml. Interaction of 16a, 16b, 16d–g with calf-thymus DNA (CT-DNA) was also supported by absorption titration studies. The compounds exhibit good binding propensity to CT-DNA and the DNA binding affinity (Kb) of the compounds varies as 16a; 16b; 16e; 16g > 16d; 16f. Interaction of 16d with CT-DNA was also investigated by fluorescence spectroscopy. The results support an intercalative interaction of 16d and 16f and non-intercalation mechanism for 16a, 16b, 16e, and 16g.
