One-pot synthesis, antibacterial and antifungal activities of novel 2,5-disubstituted-1,3,4-oxadiazoles

A series of novel 2,5-disubstituted-1,3,4-oxadiazoles have been synthesized from long-chain alkanoic and alkenoic acids. The structures of these compounds have been elucidated by elemental and spectral （IR, ^1H NMR, ^13C NMR, MS） analysis. Furthermore, compounds were screened for in vitro antibacterial activity against the representative panel of two Gram-positive and two Gram- negative bacteria. All the synthesized compounds were also tested for their inhibitory action against five strains of fungus. The various compounds show potent inhibitory action against test organisms. 2007 Abdul Rauf. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.     

Design,synthesis and biological evaluation of sulfenimine cephalosporin sulfoxides as β-lactamase inhibitors

A series of sulfenimine cephalosporin sulfoxide derivatives(7a–v) were designed, synthesized and evaluated for their inhibitory activity against TEM-1 and cephalosporinase in cell-free systems. Some of the tested compounds showed enhanced inhibitory activity against class C b-lactamase cephalosporinase compared with the tazobactam. The most promising compounds 7c and 7n(IC50= 7.6 and8.6 mmol/L, respectively) were further investigated in combination with cefradine against a variety of clinical isolated b-lactamase-producing bacterial strains.     

Synthesis and in vitro cytotoxic activities of sorafenib derivatives

A series of novel sorafenib derivatives have been designed and synthesized.The cytotoxic activities of these compounds were tested in three tumor cell lines.Most of the compounds showed potent antiproliferative activity against the tested cell lines with IC50= 0–20 mmol/L.Some compounds demonstrated competitive antiproliferative activities to sorafenib against all three cancer cell lines.Among them,compound 5g demonstrated significant inhibitory activity against A549,ACHN and MDAMB-231 cell lines with IC50values of 1.29,1.99,3.11 mmol/L,respectively.     

Syntheses and Anti-cancer Activities of Derivatives of Tetrandrine and Fangchinoline

A series of derivatives of tetrandrine and fangchinoline was designed and synthesized to find more active anti-cancer compounds. Their anti-cancer activities were tested against human hcpatocellular carcinoma BEL-7402 and PLC/PRF/5 cells, human lung adenocarcinoma A549 cells as well as human leukaemia K562 cells, and the structure-activity relationship（SAR） was also studied. All the compounds except BI exhibited superior inhibitory ac- tivities against PLC/PRF/5 cells with half maximal inhibitory conccntration（ICs0） values of less than 15 μmol/L, and compounds A2, A4, B2 and B4 showed IC50 values of less than 9 pmol/L. Compounds A2, A6, B2 and B4 showed potent anti-cancer activities against all the tested cells with 1C5o values of less than 10 pmol/L. The results show that terandrine and fangchinoline derivatives are potential suppressors to human cancer.     

Gold-catalyzed oxazoles synthesis and their relevant antiproliferative activities

Nine 5-aryl-2-methyloxazole derivatives were synthesized via gold-catalyzed alkyne oxidation. All of the compounds have been screened for their antiproliferative activities against MCF-7 cell （human breast carcinoma）, A549 cell （human lung carcinoma） and Hela cell （human cervical carcinoma） lines in vitro. The results revealed that compounds 1b, 1c and 1d exhibited strong inhibitory activities against the MCF-7 cell lines （with ICso values of 4.6, 9.7 and 2.2 μmol/L, respectively）.     

Synthesis and bioactivity of novel 3-(1-hydroxyethylidene)-5-substituted-pyrrolidine-2,4-dione derivatives

Ten novel 5-substituted derivatives of 3-(l-hydroxyethylidene)pyrrolidine-2,4-dione were synthesized.The compounds were confirmed by IR,:H NMR,MS and elemental analysis.The bioassay indicated that these compounds showed noticeable herbicidal activities,and compounds 6f and 6j exhibited excellent inhibitory activities against the stalk of Echinochloa crusgalli,with EC50 values of 94.4 and 72.7 mg/L,respectively.     

Design,synthesis and biological evaluation of indole derivatives as novel inhibitors targeting B-Raf kinase

A series of novel indole derivatives were designed and synthesized and their inhibitory activity against B-Raf and HepG2 cell were also described. Among them, compounds 7a and 7b exhibited excellent potency, which showed the potential for further research as lead compounds.     

Design, synthesis and antitumor activity of a series of novel coumarin-stilbenes hybrids, the 3-arylcoumarins

<正>A series of novel coumarin-stilbenes hybrids called 3-arylcoumarins were synthesized via Perkin reaction and evaluated as potential antitumor agents.The results showed that some compounds exhibited in vitro activity against KB,KV,MCF-7,MCF-7/ ADR cell lines to some extent.Compound 3a showed remarkable effect against KB tumor cells with an IC_(50) value of 5.18μmol/L.     

Acrosin structure-based design,synthesis and biological activities of 7-azaindol derivatives as new acrosin inhibitors

A series of 7-azaindol derivatives were designed based on the homologous 3D model of human acrosin.These compounds were synthesized and evaluated for their human acrosin inhibitory activities in vitro.Compounds 7a,7i,7j,7k and 7n showed highly inhibitory activity against human acrosin.The three-dimensional structure-activity relationship was investigated through a CoMFA model,which provided valuable information to further study of potential human acrosin inhibitors.     

Identification of hydrazone moiety-bearing aminopyrimidines as potent antitumor agents with selective inhibition of gefitinib-resistant H1975 cancer cells

Based on our previous work,a series of hydrazone moiety-bearing aminopyrimidines were synthesized.The compounds were evaluated for inhibitory activities against EGFRT790M/L858 R and antiproliferative activities against H1975 and A549 NSCLC cell lines harboring different forms of EGFR.Compounds 7f and7 k exhibited potent and selective activity in inhibition of gefitinib-resistant H1975 cancer cells(IC_(50);0.45,0.2μmol/L) while were much less active on A549 cancer cells(IC_(50);52.83,100μmol/L).Both compounds could be served as promising lead compounds for further investigation.     

Design, synthesis and antitumor activity of 3-substituted quinolone derivatives (Ⅰ)

A series of quinolone derivatives containing benzimidazole, benzoxazole or benzothiazole ring were synthesized. The cytotoxicity of 12 new compounds was evaluated in KB, Be17402, A2780 and HT-29 cell lines. Most of synthesized compounds showed moderate inhibitory activity against cancer cells. The inhibitory activities of 6k, against KB and A2780 tumor cells are comparable to that of topotecan, one of topoisomerase I inhibitors.     

Synthesis of 2-(2,3,4-trimethoxyphenyl)-1-(substituted-phenyl)acrylonitriles: in vitro anticancer activity against MCF-7, PC-3 and A2780 cancer cell lines

A series of 2-(2,3,4-trimethoxyphenyl)-1-(substituted-phenyl)acrylonitrile (2–9) were designed and synthesized to develop new cancer drugs. The structures of synthesized compounds 2–9 were described by using melting point, mass (MALDI-TOF-MS), FT-IR, elemental analysis, ¹H, ¹³C, ¹³C-APT and 2D NMR spectroscopy. The in vitro anticancer activities of 2–9 against human breast cancer (MCF-7), human prostate cancer (PC-3) and human ovarian cancer cells (A2780) were investigated by [3-(4,5-dimethylthiazol)-2-yl]-2,5-diphenyl-2H-tetrazolium bromide] (MTT) assay method. Additionally, the LogIC₅₀ values of these compounds on A2780, MCF-7 and PC-3 cell lines were calculated by using inhibition % values by the GraphPad Prism 6 program on a computer. The results indicated that these compounds have high anticancer activity against MCF-7, PC-3 and A2780 cell lines (especially A2780 cell lines, p < 0.05).     

Design, synthesis and antitumor activity of a series of novel coumarin-stilbene hybrids, the 3-arylcoumarins

A series of novel coumarin-stilbene hybrids called 3-arylcoumarins were synthesized via Perkin reaction and evaluated as potential antitumor agents. The results showed that some compounds exhibited in vitro activity against KB, KV, MCF-7, MCF-7/ADR cell lines to some extent. Compound 3a showed remarkable effect against KB tumor cells with an IC50 value of 5.18 μmol/L.     

Synthesis and cytotoxic evaluation of new colchicine derivatives bearing 1, 3, 4-thiadiazole moieties

In search of novel anticancer agents, a series of N-methyl colchiceinamide derivatives (7a-7i) containing 1,3,4-thiadiazole moieties were synthesized, and their structures were confirmed by spectral analysis. Cytotoxicity of these compounds was evaluated by MTT assay in vitro against four human tumor cell lines, i.e. A2780, A549, BEL7402, and MCF-7. The results indicated that most of the derivatives showed significant anticancer activities, particularly, compounds 7h and 7i showed more potent cytotoxic activities of all screened cancer cells than colchicine.     

Two new tricycloalternarenes from Hawaiian endophytic fungus Didymella sp. FT433

Two new compounds, tricycloalterenes M and N (1 and 2) and six known analogs were isolated from the cultured broth of Didymella sp. FT433. The structures of all the compounds were elucidated through the analysis of HRMS and NMR spectroscopic data. The absolute configurations (AC) of the new compounds were determined by CD. All compounds were tested against A2780 and cisplatin resistant A2780 (A2780CisR) cell lines, and pathogenic bacteria Staphylococcus aureus, Escherichia coli, Bacillus subtilis, and Pseudomonas aeruginosa, but none was active.     

5-氟尿嘧啶自旋标记衍生物的合成及其抗肿瘤活性研究

将4种稳定氮氧自由基引入5-氟尿嘧啶,合成了10个新的5-氟尿嘧啶(Fu)自旋标记衍生物2a-8.经元素分析、IR、UV、MS和ESR确定了其组成和结构.化合物对KB、HCT-8和A 2780细胞毒性实验结果表明,化合物2a和3a的抗癌活性高于5-Fu,与HCFU的活性相当.     

A new series of titanocene dichloride derivatives bearing cyclic alkylammonium groups: Assessment of their cytotoxic properties

Ten new water soluble titanocene dichloride derivatives have been synthesized and characterized and their cytotoxicities against the human lung cancer cell line A549 have been assessed. The potencies of the compounds vary greatly, but dicationic 3-picolylium and 4-picolylium compounds exhibit IC₅₀ values that are unusually low for this class of compounds. In view of their potency against A549 cells, three of the new complexes were tested further on additional human cell lines including the small cell lung cancer cell line H69, the widely used cervical carcinoma cell line HeLa, the ovarian carcinoma cell line A2780 and its cisplatin resistant derivative A2780/CP. All three compounds exhibited potencies in all cell lines comparable to or better than those observed with the A549 cells, while one complex is actually more potent than cisplatin for HeLa cells.     

Synthesis and antitumor activity of α-aminophosphonate derivatives containing thieno[2,3-d]pyrimidines

Two series of thieno[2,3-d]pyrimidine derivatives were designed and synthesized, in which bioactive a-aminophosphonate subunits were introduced at the N3 position through an N–N bond connection.The in vitro cytotoxic activity of the novel compounds was tested against human esophageal carcinoma cells(EC109), human hepatocarcinoma cells(Hep G2), human gastric carcinoma cells(MGC-803),respectively, by the MTT method. The evaluation results revealed that compounds 6mb, 6mf, 6mg, 6nd and 6nh exerted the most potent inhibition against Hep G2, MGC-803 and EC109 cells, respectively. In particular, compound 6mg presented excellent inhibitory effect against Hep G2(91.2%) and MGC-803(94.4%) cells.     

Total synthesis and cytotoxicity of (−)-jorumycin and its analogues

(?)-Jorumycin and its 15 C-22 analogues were prepared employing l-tyrosine as the chiral starting material via 21 steps. These analogues, along with (?)-jorumycin itself, were evaluated in vitro for cytotoxicity against HCT-8, BEL-7402, Ketr3, A2780, MCF-7, A549, BGC-823, Hela, HELF, and KB cells. The IC₅₀ values of the cytotoxicity of most of these analogs were at the level of nM, which was similar to that of (?)-jorumycin. Among these analogs including (?)-jorumycin, hippuric acid ester derivative 23 exhibited the most potent and broad-spectrum cytotoxic activity against the ten cell lines with an average IC₅₀ of 2.12 nM.