Design,Synthesis and Antitumor Activity of Novel Indolin-2-one Derivatives Containing 4-Thiazolidinone Moiety

A series of novel indolin-2-one derivatives containing 4-thiazolidinone moiety(7a―7r) were synthesized and evaluated for their in vitro antitumour activities against MDA-MB-231(human breast cancer), H460(human lung cancer) and HT-29(human colon cancer) cell lines by standard 3-(4,5-dimethylthiazae-2-yl)-2,5-diphenyltetrazo- lium bromide(MTT) assay. Representative compounds(7d, 7k, 7m, 7p) with higher cytotoxicity were further examined against one normal cell line(WI-38, human fetal lung fibroblasts). The preliminary investigation shows that most of the compounds display moderate to excellent potency and high selectivity against different human cancer cell lines. In particular, the most potent compound 7m shows promising cytotoxicity against MDA-MB-231, H460 and HT-29 cell lines with IC₅₀ values of 0.78, 0.056 and 0.018 μmol/L, respectively. The potency is much higher than that of Sunitinib(IC₅₀=3.46 μmol/L against MDA-MB-231, IC₅₀=2.59 μmol/L against H460, IC₅₀=1.50 μmol/L against HT-29) by 4.4, 46.3 and 83.3 fold.     

Synthesis of New 4,5-Dihydro-1-methyl-[1,2,4]triazolo[4,3-a]quinolin-7-amine–Derived Ureas and Their Anticancer Activity

A new series of 1,2,4-triazolo[4,3-a]-quinoline derivatives were designed and synthesized to meet the structural requirements essential for anticancer activity. N-1-(5-Methylisoxazol-4-yl/4-fluoro-2,3-dihydro-1H-inden-1-yl/aryl)-N’-3-(4,5-dihydro-1-methyl-[1,2,4]triazolo[4,3-a]quinolin-7-yl) urea derivatives were accomplished in good yields by the reaction of 4,5-dihydro-1-methyl-[1,2,4]triazolo[4,3-a]quinolin-7-amine with 3-(3-chloro-5-fluoro-2-methoxyphenyl)-5-methyl-isoxazole-4-carboxylic acid, 4-fluoro-2,3-dihydro-1H-indene-1-carboxylic acid, and various simple aromatic carboxylic acids in the presence of diphenyl phosphoryl azide (DPPA). All the newly synthesized title compounds were characterized by elemental and spectral data. Furthermore, anticancer activity was screened for the title compounds (12a–j) in vitro against human neuroblastoma cell lines (SK N SH) and human colon carcinoma cell lines (COLO 205) by using the MTT cell viability method. A few of them (12a and 12b) possess significant cytotoxicity, and some other compounds 12d-f and 12j displayed moderate cytotoxicity against both cell lines.     

Synthesis and antitumor activity of some new pyrazolo[1,5-a] pyrimidines

New series of pyrazolo[1,5-a]pyrimidine derivatives 7a-i, 11a-c and Schiff bases 13a-c were synthesized and screened for their in vitro antitumor activity against three human carcinoma cell lines, namely colorectal carcinoma (HCT116), prostate adenocarcinoma (PC-3) and liver carcinoma (HepG-2) using MTT cytotoxicity assay at 100 μg/mL. Some of the tested compounds displayed good anticancer activities against HCT-116 and PC-3 cells. Whereas, compounds 7d and 11a showed better antitumor activity than the rest of the compounds against both cell lines. A structure-activity relationship (SAR) has been discussed and structures of the newly synthesized compounds were confirmed by different spectral data (MS, IR, ¹H NMR and ¹³C NMR) and elemental analysis.     

Syntheses and Antiproliferative Activities of Novel Diarylthiosemicarbazide Derivatives

A series of novel N-methylpicolinamide-moiety containing diarylthiosemicarbazide derivatives was prepared and evaluated for their in vitro antiproliferative activity against three cancer cell lines(human alveolar epithelial cell A549, human lung cancer cell H460 and human colorectal cancer cell HT-29) by 3-(4,5-dimethyl)thiazolyl-diphenyltetrazoliumromide(MTT) assay. Six compounds(7b―7g) with halogen substituents exhibited preferable cytotoxicity against one or more cell lines in a low micromolar range. Especially, the most promising compound 7g exhibited remarkable antiproliferative activity with the IC50 values of 2.2, 1.8 and 5.2 μmol/L against A549, H460 and HT-29 cell lines respectively, which is comparable to sorafenib.     

Design,Synthesis and Anticancer Activity of Novel 6-（Aminophenyl）-2,4-bismorpholino-1,3,5-triazine Derivatives Bearing Arylmethylene Hydrazine Moiety

In an attempt to develop potent and selective anticancer agents,we designed and synthesized a series of novel bis（morpholino-1,3,5-triazine） derivatives beating aylmethylene hydrazine moiety and evaluated their cytotoxicity,in vitro,against H460（non-small-cell lung cancer）,HT-29（human colorectal cancer） and MDA-MB-231（human breast cancer） cell lines.The pharmacological results indicate that all the compounds exhibit enhanced cytotoxicity than BMCL-200908069-1,and six target compounds（7e,7h,7j,9a,9b,9c） were superior to PAC-1 against all the tested cancer cell lines.The most active compound 7j,with IC50（inhibitory concentration 50％）values of 0.75,0.34 and 0.60 μ mol/L against HT-29,H460 and MDA-MB-231 cancer cell lines,was 39-,28-,and 60-fold more potent than BMCL-200908069-1 （29.24,9.52 and 36.21 μmol/L）,respectively.     

Isolation and Stucture Elucidation of Diterpenes from Wedelia prostrata and Their Cytotoxicity Activities

In this paper, a new diterpene together with seven known diterpenes was isolated from Wedelia prostrata. The chemical structure of the new compound was elucidated via 1D and 2D nuclear magnetic resonance(NMR) techniques and mass spectrometry and identified to be 3α-phenylpropionoyloxy-ent-kaur-16-en-oic acid(1). The isolated diterpenes were tested for their cytotoxicity activities via 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide(MTT) assay. The results show that compounds 1, 2, 3, 4 and 6 exhibit different levels of cytotoxic activities. Especially, compound 2 shows significant cytotoxicity toward HeLa and A549 cell lines(IC₅₀=6.14 and 8.76 μmol/L).     

Cytotoxicity of new 5-phenyl-4,5-dihydro-1,3,4-thiadiazole analogues

A series of 5-phenyl-4,5-dihydro-1,3,4-thiadiazoles were synthesized and their cytotoxicity was examined against four human cancer cell lines, e.g. lung cancer (A549), ovarian cancer (SK-OV-3), skin cancer (SK-MEL-2), and colon cancer (HCT15). The title compounds were synthesized by condensation of thiosemicarbazide with substituted benzaldehydes, followed by cyclization with acetic anhydrides in good yields. Most of the compounds exhibited significant suppressive activity against the growth of all of the cancer cell lines. The 4-hydroxy analogue of 5-phenyl-4,5-dihydro-1,3,4-thiadiazole (2h) was most active in the inhibition of growth of the SK-MEL-2 cell line, with an IC(50) value of 4.27 μg/ml; followed by compound 2a (IC(50) 5.16 μg/ml). The compounds 2j, 2h, and 2b, bearing 3-methoxy-4-hydroxy-, 4-hydroxy- and 4-methyl substituents in the C-5 phenyl ring respectively, exhibited the highest activity against the SK-OV-3 (IC(50) 7.35 μg/ml), HCT15 (IC(50) 8.25 μg/ml) and A549 (IC(50) 9.40 μg/ml) cell lines, respectively. A structure-activity relationship study revealed that an optimal electron density on the C-5 phenyl ring of 1,3,4-thiadiazoles is crucial for their cytotoxic activity against the human cancer cell lines used in the present study.     

An Efficient One-pot Synthesis of Certain Stereoselective Spiro[pyrazole-4,5'-isoxazoline]-5-one Derivatives: In vitro Evaluation of Antitumor Activities,Molecular Docking and In silico ADME Predictions

A library of novel spiro[pyrazole-4,5'-isoxazoline]-5-one derivatives were designed and synthesized using a concise and efficient one-pot reaction protocol through 1,3-dipolar cycloaddition between 4-benzylidene-3-methyl-1-phenyl-1H-pyrazol-5(4H)-one and chlorooximes. The synthesized derivatives were elucidated and characterized based on their spectroscopic data, including infrared spectrometry(IR), ¹H NMR, ¹³C NMR, and elemental and mass spectral analysis. The synthesized compounds were evaluated for their antitumor inhibition potency against four human cancer cell lines, including human prostatic adenocarcinoma (PC3), human colorectal carcinoma(HCT116), human liver hepatocellular carcinoma(HepG2) and breast adenocarcinoma (MCF7). The outcomes were compared with the standard reference drug Doxorubicin. Among the synthesized chlorooximes, compounds 6d and 6e were the most active compounds on all cell lines. The spiro[pyrazole-4,5'-isoxazoline]-5-one derivatives 7a and 7c were active on the HepG2 liver cancer cell line. In comparison, compounds 7f and 7g were moderately active on the MCF7 cell line. The structure-activity relationship was explored for the synthesized compounds. Besides, in silico analysis of physicochemical, adsorption, distribution, metabolism, excretion and toxicity(ADMET) properties were done to determine the potential capacity of drug candidates. Molecular docking study onto the epidermal growth factor(EGF) tyrosine kinase receptor(3POZ) was done for the most active compounds to validate the reliability of in vitro anticancer screenings.     

Synthesis and antitumor activities of a new series of 4,5-dihydro-1H-thiochromeno[4,3-d]pyrimidine derivatives

A new series of 4,5-dihydro-1H-thiochromeno[4,3-d]pyrimidine derivatives have been designed and synthesized.The antitumor activities of the target compounds have been evaluated in vitro against two human cancer cell lines including A549 (human alveolar adenocarcinoma cell) and H460 (human lung cancer) by MTT assay.Most of the target compounds exhibited significant antitumor activities against A549 and H460 cancer cell lines.The most potent compound 4-(benzo[d][1,3]dioxol5-yl)-8,9-difluoro-2-(4-methylpiperazin-1-yl)-4,5-dihydro-1H-thiochromeno[4,3-d]pyrimidine (CH05) (IC50=0.44 M,3.07 M) was 2.0 and 8.4 times more active than gefitinib (IC50=0.89 M,16.81 M) against A549 and H460 cell lines,respectively.     

Semisynthesis and Cytotoxicity Evaluation of a Series of Ocotillol Type Saponins and Aglycones from 20(S)-Ginsenoside Rg2, Rh1, Protopanaxatriol and Their 20(R)-Epimers

With the oxidation treatment, eighteen compounds were separated from 20(S)-ginsenoside Rg₂, Rh₁, protopanaxatriol(PPT) and their 20(R)-epimers in total and cytotoxicity of most of them was evaluated against three human cancer cell lines HeLa, A549 and MCF-7 by 3-(4,5-dimetylthiazol-z-yl)-2,5-diphenyltetrazolium bromide(MTT) assay. Their structures were confirmed by means of nuclear magnetic resonance(NMR) and mass spectrometry and the results were compared with those of previous literature. In this study, we systematically semisynthesized all four ocotillol type saponins, i.e., (20S, 24S), (20S, 24R), (20R, 24S) and (20R, 24R). All the configurations at C20 kept the same with their starting materials. Meanwhile a pair of C24 epimers was generated in terms of ocotillol type saponins. In addition, seven compounds(4-8, 13 and 14) were reported firstly. The cytotoxic results distinguished the ocotillol type products(6, 7, 13 and 14) from 20(R)-PPT and 20(R)-ginsenoside Rh₁, which possessed better cytotoxicities than their correspondents from 20(S)-epimers against HeLa cells, and the carbonyl group at C3 can improve the cytotoxi-city, which helped us to gain deeper insight into Ocotillol type saponins.     

Synthesis and antitumor activity of 1-acetyl-3-(4-phenyl)-4,5-dihydro-2-pyrazoline-5-phenylursolate and 4-chalcone ursolate derivatives

New 4-chalcone ursolate and 1-acetyl-3-(4-phenyl)-4,5-dihydro-2-pyrazoline-5-phenyl ursolate derivatives were synthesized by esterification of UA and chalcone or pyrazoline. The compounds were structurally confirmed by IR, ¹H NMR, ¹³C NMR, and HR-MS spectroscopy. The cytotoxicity of ten derivatives was evaluated against A549, SKOV3, and HepG2 cell lines by MTT assay. The result showed that several compounds were more potent than UA against A549 and SKOV3 cells; however, none of them were more potent than UA against HepG2.     

Design, Synthesis and Anticancer Activities of Diaryl Urea Derivatives Bearing <i>N</i>-Acylhydrazone Moiety

A new series of diaryl urea derivatives bearing N-acylhydrazone moiety were designed and synthesized. All the target compounds were evaluated for their cytotoxic activities in vitro against human lung adenocarcinoma epithelial cell line (A549), human breast cancer cell line (MDA-MB-231) and human leukemia cell line (HL-60) by standard 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay. Several compounds (1a, 1f and 1h) were further evaluated against human embryonic fibroblast, lung-derived cell line (WI38). The pharmacological results indicated that some compounds exhibited promising anticancer activities. In particular, compound 1f showed the most potent cytotoxicity against the tested three cell lines with IC50 values of 0.41?μM, 0.24?μM and 0.23?μM, respectively.     

Design and Synthesis of Hydrazine and Oxadiazole-containing Derivatives of Sorafenib as Antitumor Agents

A series of hydrazine and oxadiazole analogs of Sorafenib was designed, synthesized and characterized by proton nuclear magnetic resonance(¹H NMR) spectrometry and high resolution mass spectrometry(HRMS). The antiproliferative activities of these compounds against human colorectal carcinoma(HCT-116) and human breast cancer (MDA-MB-231) tumor cell lines were evaluated in vitro by MTT method[MTT=3-(4,5-dimethylthiazol-2-yl)-2,5- diphenyltetrazolium bromide]. The bioassay results suggest that most of the synthesized compounds have antitumor potential to HCT-116 cell line compared with MDA-MB-231 cell line. Compounds 8a,8b,8d, 8e,9f and 9j competitive with Sorafenib demonstrated antiproliferative activities on HCT-116 cell line.     

Synthesis and Anti-tumor Activity of Novel Glycyrrhetinic Acid Derivatives

Twenty-five derivatives of glycyrrhetinic acid(GA)modified on the A-ring,at C30 and C11 positions were synthesized.Their in vitro cytotoxicity against various cancer cell lines[henrietta lacks strain o...     

Cytotoxic alkaloids and a flavan from the bulbs of Crinum asiaticum var. japonicum

A new pyrrolophenanthridone alkaloid, criasiaticidine A (1), was isolated from the bulbs of Crinum asiaticum var. japonicum, together with pratorimine (2), lycorine (3) and 4'-hydroxy-7-methoxyflavan (4). The structure of the new alkaloid was determined to be 4,5-etheno-9,10-dihydroxy-6-phenanthridone by spectroscopic means. The cytotoxicity of the isolated compounds 1-4 was evaluated in vitro against Meth-A (mouse sarcoma) and Lewis lung carcinoma (mouse lung carcinoma) tumor cell lines. Furthermore, 3 was examined for in vivo antitumor activity with LLC tumor cells.     

Design, synthesis, and biological evaluation of novel spin-labeled derivatives of podophyllotoxin as potential antineoplastic agents. Part XII

Five novel nitroxyl spin-labeled ester derivatives of podophyllotoxin (11a-11e) have been prepared and their structural information on these nitroxyl spin-labeled ester derivatives of podophyllotoxin (11a-11e) using (1)HNMR spectroscopy was efficiently obtained by application of the in situ reduction of representative nitroxyl spin-labeled ester derivative of podophyllotoxin 11e with phenylhydrazine for the preparation of N-hydroxylamine 12 in the NMR tube. These novel derivatives were further evaluated for their in vitro cytotoxic activity against five neoplastic cell lines (K562, HL-60, SPCA-1, Lewis, and L-1210) using MTT assay. Most of the target compounds (except for all these compounds against SPCA-1) exhibited more pronounced cytotoxicity against several neoplastic cell lines than that of the prototypical inhibitor etoposide.     

New cytotoxic apigenin derivatives from Selaginella doederleinii

75%aqueous ethanol extract from the whole herbs of Selaginella doederleinii was isolated,and two new apigenin derivatives,doederflavones A(1) and B(2),together with ten known compounds(3-12) were characterized.Their structures were assigned by extensive spectroscopic methods including 1D/2D NMR and HR-ESIMS.Compounds 1-6 bear an aryl substituent at the C-8 or C-6 positions in ring A of apigenin skeleton.Compounds 1 and 2 were evaluated for their in vitro cytotoxicity against four human cancer cell lines A549,MCF-7,SMMC-7721,and LoVo,both of which exhibited significant cytotoxicity against A549 with IC_(50) values of 0.82 μmol/L and 1.32 μmol/L,respectively.     

Synthesis, Characterization and Cytotoxicity of Ammine/Methylamine Platinum(Ⅱ) Complexes with Carboxylates

Seven novel platinum (Ⅱ) complexes [Pt (Ⅱ) (NH3) (CH3NH2) X2] (Ⅰ -Ⅶ) (X: CH3COO- ,CH2 ClCOO - , CHCl2COO -, C6H5-COO - , p-CH3O-C6H4 -COO - , p-NH2-C6 H4 -COO - , p-NO2 -C6 H4 -COO-) were prepared and characterized by means of elemental analysis, molar conductivity, thermal analysis,IR, UV, and 1 H NMR spectrometries. The cytotoxicity against HCT-8, BGC-823, MCF-7, EJ, and HL-60 cell lines increases in the following sequence: cisplatin ＞Ⅳ＞Ⅴ＞Ⅵ＞Ⅶ＞Ⅰ＞Ⅱ＞Ⅲ. Moreover, the complexes(Ⅰ -Ⅶ) display substantially greater activities against EJ and HL-60 cell lines than those against the cell lines from other carcinomas. They can induce a concentration-dependent accumulation of HL-60 cells in the G2/M phase of the cell cycle as cisplatin. There is no significant correlation between total DNA platination levels and cytotoxicity of the complexes.     

开口箭化学成分及抗肿瘤活性

从开口箭新鲜根茎中分离得到8个化合物, 通过理化性质分析、 质谱、 红外光谱及核磁共振波谱检测等方法鉴定了其结构, 分别为开口箭皂苷J(1)、 (25S)-26-O-β-D-吡喃葡萄糖基呋甾-1β,3β,22α,26-四羟基-3-O-β-D-吡喃葡萄糖苷(2)、 洋地黄毒苷元-3-O-α-L-吡喃岩藻糖苷(3)、 弯蕊皂苷元B(4)、 异罗斯考皂苷元(5)、 罗斯考皂苷元(6)、 香豌豆酚(7)及(+)-儿茶素(8). 其中, 化合物1为新化合物, 化合物3, 4, 7和8为首次从该属植物中分离得到. 在抗人结肠癌细胞LoVo和胃癌细胞BGC-823活性评价中, 化合物5和6表现出较强的抗肿瘤活性, 半抑制浓度(IC₅₀)值分别达到0.532和0.757 μmol/L.     

Synthesis and Tumor Cytotoxicity of Novel 1, 2, 3-Triazole-substituted 3-Oxo-oleanolic Acid Derivatives

Fifteen novel 3-oxo-oleanolic acid esters bearing aryl substituted 1,2,3-triazolyl methyl moiety were synthesized via the method of Copper(I)-catalyzed Huisgen cycloaddition. The cytotoxicity evaluation results of these compounds against five human tumor cell lines show that most of these compounds presented potent activity and selectivity against A375-S2 and HT1080 cells. Compound 6c, with a p-NO₂ at the bezene ring, possesses the best inhibitory activity against A375-S2(IC₅₀=2.82 μmol/L) and HT1080(IC₅₀=1.69 μmol/L).