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.     

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 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.     

Synthesis and Activity Evaluation of Novel Prenylated Flavonoids as Antiproliferative Agents

Twenty prenylated flavonoids 1-20 were synthesized by glycoside hydrolysis, dehydrogenation, selective O-methylation, O-prenylation and Claisen rearrangement reaction, from abundant and inexpensive natural flavonoids naringin, hespiredin, quercetin and myricetin. Among them, 1-7, 10-15 and 17-20 are novel compounds, the natural product 3,3',4',7-tetramethoxy-8-prenyl-5-hydroxy flavonoid(16) was synthesized in a high yield. Their antiprolirative activities were evaluated in vitro on a panel of three human cancer cell lines(HeLa, HCC1954 and SK-OV-3). The results show that most of the target compounds displayed moderate to potent antiprolirative activities against the three cancer cells with half maximal inhibitory concentration(IC₅₀) values from 0.49 μmol/L to 95.07 μmol/L. Among them, 3',4',7-trimethoxyl-5-hydroxyl-8-prenyl flavonoid(12) exhibited the strongest antiprolirative activity against the three cancer cells mentioned above with IC₅₀ values of 0.91-7.08 μmol/L. 3',7-Dimethoxy-5-O-prenyl flavone(6) and 3',4',7-trimethoxy-5-O-prenyl flavone(10) showed selective antiproliferative activity against HCC1954 cells with IC₅₀ value of 0.49 and 5.32 μmol/L, respectively.     

新型紫罗兰酮基双查尔酮缩氨基硫脲的合成及抗肿瘤活性

根据活性亚结构拼接原理,通过紫罗兰酮与(取代)苯甲醛反应合成了紫罗兰酮基双查尔酮,然后经与氨基硫脲缩合得到一系列未见报道的新型含紫罗兰酮、查尔酮及氨基硫脲3种优势结构单元的杂化体,它们的化学结构经傅里叶变换红外光谱(FT-IR)、核磁共振波谱(~1H NMR、~(13)C NMR)、元素分析及质谱(MS)等测试技术所证实。采用溴化噻唑蓝四氮唑(MTT)法初步测定其体外抗肿瘤活性(乳腺癌细胞(MCF-7),肝癌细胞(Hep G2),肺癌细胞(A549)),结果表明,对于不同类型的肿瘤细胞,化合物展现较好的增殖抑制活性。尤其是化合物3a与3b对MCF-7细胞展现较强的抗增殖活性,半数致死量(IC_(50))值分别为10.83和7.62μmol/L,化合物3e对A549细胞显示一定的增殖抑制活性效果(IC_(50)值为13.36μmol/L),化合物3f对Hep G2细胞表现了高效的抗增殖活性(IC_(50)值为8.55μmol/L)。目标物的抗增殖活性与紫罗兰酮结构及查尔酮环上不同电子效应的取代基有关。     

Design,synthesis and antiproliferative activities of diaryl urea derivatives bearing N-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 antiproliferative activities against human leukemia cell line(HL-60),human lung adenocarcinoma epithelial cell line(A549) and human breast cancer cell line(MDA-MB-231) in vitro by standard MTT assay.The pharmacological results indicated that some compounds exhibited promising antitumor activities.Compound 1j showed the most potent antiproliferative activity against the tested three cell lines with IC values of 0.13 mmol/L,0.7 mmol/L and 0.5 mmol/L,respectively.     

Expeditious synthesis,antileishmanial and antioxidant activities of novel 3-substituted-4-hydroxycoumarin derivatives

A series of novel 3-substituted-4-hydroxycoumarin derivatives 6(a–1) were synthesized in high yield using one-pot three component coupling reaction catalyzed by ceric ammonium nitrate. These compounds were evaluated for antileishmanial activity against Leishmania donovani promastigotes and antioxidant activity(DPPH-radical scavenging activity). Two compounds, 6h(IC_(50)= 9.90 μmol/L) and 6i(IC_(50)= 6.90 μmol/L) displayed potent antileishmanial activity when compared with standard antileishmanial agents pentamidine(IC_(50)= 16.15 μmol/L) and miltefosine(IC_(50)= 12.50 μmol/L). Three compounds, 6c(IC_(50)= 10.79 μmol/L), 6h(IC50= 10.60 μmol/L), and 6i(IC_(50)= 10.73 μmol/L) showed significant antioxidant activity favorably with the antioxidant standards butylated hydroxy toluene(IC_(50)= 16.47 μmol/L) and ascorbic acid(IC_(50)= 12.69 μmol/L). A molecular docking study of compounds 6(a–1) suggested a possible mode of binding with the Adenine phosphoribosyltransferase enzyme of L.donovani. ADME properties were predicted in silico and support the potential of 6(a–1) to show favorable drug-like properties.     

新型吲唑-查尔酮杂合物的合成及抗肿瘤活性

设计并合成了一系列新型含查尔酮-吲唑杂合衍生物,并对其体外肿瘤活性进行初步研究。 先以2,6-二氟苯腈和吗啉为起始原料,经过取代和环合两步反应合成4-吗啉-3-氨基-1H-吲唑。 4-吗啉-3-氨基-1H-吲唑与含羧基的查尔酮中间体与经过酰胺化反应制备了9个新型含查尔酮-吲唑杂合衍生物,其结构经傅里叶变换红外光谱仪(FTIR)、核磁共振波谱仪(NMR)、质谱(MS)和元素分析确证。 采用MTT法,以索拉菲尼为阳性对照药,以人胃癌细胞株(MKN45)和人肺癌细胞株(A549)为测试细胞株对目标化合物进行抗肿瘤活性评价。 结果表明,大部分目标化合物显示了较好的抗肿瘤活性,其中化合物4a和4d活性较好,其抑制人胃癌细胞株MKN45的IC₅₀分别为2.65和3.55 μmol/L,均优于阳性对照药索拉菲尼(IC₅₀=4.69 μmol/L)。     

Design,Synthesis and Pharmacological Evaluation of Novel 4-Phenoxyquinoline Derivatives as Potential Antitumor Agents

A series of novel 4-phenoxyquinoline derivatives containing 3-amino-2-cyano-acrylamide framework was designed and synthesized, and the in vitro cytotoxic activities of them against five cancer cell lines(HT-29, H460, A549, MKN-45, and U87MG) were evaluated. Most of the compounds exhibited moderate-to-significant cytotoxicity and high selectivity against one or more cell lines as compared with Foretinib. The studies of their preliminary structure-activity relationships(SARs) indicate that the compounds containing methyl groups, especially methyl groups at 4-position of the phenyl ring(moiety B) are more effective. Among them, compound 36 shows the most potent antitumor activities with IC₅₀ values of 0.04, 0.09, 0.67, 0.39 and 1.10 μmol/L against HT-29, H460, A549, MKN-45 and U87MG cell lines, respectively.     

Design,Synthesis and Biological Evaluation of Novel Benzothiazole Derivatives Bearing Semicarbazone Moiety as Antitumor Agents

A series of novel benzothiazole derivatives bearing semicarbazone as a linker was designed and synthesized, and their in vitro antitumor activities were evaluated against four cancer cell lines(HT29, H460, A549 and MDA-MB-231). Most of them showed moderate to excellent activity against all the tested cell lines. Among them, compounds 12a―12i with fluoro-substituted benzyl-1H-indole moiety displayed more potent activity than those with phenyl moiety. The most promising compound 12d exhibited excellent antitumor activity with IC₅₀ values of 0.015, 0.28, 1.53 and 0.68 μmol/L against the four tested cell lines respectively.     

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 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).     

Synthesis,Docking and Biological Evaluation of Isoquinolonic Acid Derivatives

A series of isoquinolonic acid derivatives（4a-4o） was synthesized via one-pot synthesis for their anti-tumor activity. The structures of all the targeted compounds were confirmed by IH nuclear magnetic resonance （IH NMR） spectrometry and mass spectrometry（MS）. The anti-tumor activities of compounds 4a-4o against MG63（human osteosarcoma cells） and B16-F10（mouse melanoma cells） were examined. To evaluate the antitumor effect of the as-synthesized compounds, we compared the half maximal inhibitory concentration（1C50） of compounds 4a--4o to that of camptothecin（CPT） which appeared to be active against a broad range of human cancers. Among all the compounds, compound 41 shows the most potent biological activity against MG63 cells[IC50=（2.16i0.26） μmol/L] and B16-F10 cells[IC50=（6.95±0.24）μmol/L], thus providing useful information for the antitumor activity and potential practical use of isoquinolonic acid compounds. In addition, we screened out an efficient compound（41） that shows potential inhibit activity against Topoisomerase 1（Topo 1） by docking simulation.     

Synthesis and Antitumor Activities of Novel 4-Morpholinothieno [3,2-d]pyrimidine Derivatives

A series of novel 2-hydrazinyl-4-morpholinothieno[3,2-d]pyrimidine derivatives was designed and synthesized.All of them were screened for their cytotoxic activities against large cell lung cancer（H460）,colon cancer （HT-29） and adenocarcinomic lung cancer（A549） cell lines in vitro.The pharmacological results indicate that most of the target compounds show moderate to significant activities.Especially compound 17 exhibits the most potent antitumor activities against H460,HT-29 and A549 cell lines with IC50 values of 0.57,0.45 and 1.45 μmol/L,respectively.     

Synthesis and structure-activity relationships study of α-aminophosphonate derivatives containing a quinoline moiety

Two series of a-aminophosphonate derivatives containing a quinoline moiety have been designed and synthesized by introducing bioactive quinoline scaffold to a-aminophosphonate. The in vitro cytotoxic activities of target compounds were first investigated against two human cancer cell lines including Eca109 and Huh7 by MTT assay. Results revealed that most of target compounds exhibited moderate to high antitumor activities against the tested cancer cell lines and some demonstrated more potent inhibitory activities compared with Sunitinib. Among them, compounds 4b2 and 4b4 containing methylsubstituted aniline group were found to be more active than Sunitinib against both of two cancer cell lines, with IC50 in the range of 2.26 mmol/L–7.46 mmol/L.     

Design,Synthesis and Activities of Aziridine Derivatives of N5-Methyltetrahydrofolate Against Methionine Synthase

Aziridine derivatives of N⁵-methyltetrahydrofolate were designed and synthesized based on the mechanism of methionine synthase, and their biological activities were investigated as well. The aziridine derivatives 1 and 6 exhibited superior inhibitory activities(IC₅₀: 5.05 and 4.15 μmol/L, respectively) compared to the corresponding chain analogue 4(IC₅₀=24.42 μmol/L). The results suggest that the aziridine derivatives can get potential activities against nucleophilic methionine synthase.     

Design of novel bis-benzimidazole derivatives as DNA minor groove binding agents

A new series of bis-benzimidazole derivatives were designed and synthesized.In vitro cytotoxicity evaluation showed that these compounds exhibited high activity against the selected tumor cells.Among them,compound 9 owned the best potential,its IC_(50) values being 5.95 μmol/L(mononuclear tumor cell line(U937)) and 5.58 μmol/L(cervical cancer cell(HeLa)).Fluorescence and UV-vis studies showed that compound 9 could bind into the minor groove of DNA.     

Development of bis-thiobarbiturates as successful urease inhibitors and their molecular modeling studies

Bis-thiobarbiturate derivatives 1–15 have been synthesized, characterized by1 HNMR and EI-MS and screened for urease inhibition. All compounds showed various degree of urease inhibitory activity with IC_(50) values ranging 7.45 0.12 74.24 0.81 mmol/L while the standard thiourea behaved normally(IC_(50) = 21.10 0.12). Compounds 1(IC_(50) = 7.45 0.12 μmol/L), 9(IC_(50) = 18.17 1.03 μmol/L) and 13(IC_(50) = 8.61 0.45 μmol/L) showed excellent urease inhibitory activity in the series. Molecular modeling studies were performed to understand the binding site with the bimetallic nickel center of the enzyme.Structure-activity relationship has also been established for these compounds. This study identified bisthiobarbiturate as a novel class of urease inhibitors.     

Design,Synthesis, Biological Activity and Molecular Docking Study of Coumarin Derivatives Bearing 2-Methylbiphenyl Moiety

A hybrid pharmacophore approach was used to design and synthesize a series of coumarin derivatives bearing 2-methylbiphenyl moiety, which were evaluated for their in vitro anticancer activities against four cancer cell lines(MCF-75 A549, H460 and HT29) and PD-1/PD-L1 inhibitory activities. Moreover, several compounds with excellent anticancer activities were selected to evaluate the cytotoxicities against one normal cell line(HEK-293). The most promising compound llo showed the best anticancer activities against the four tested cancer cell lines with the IC50 values of 6.45, 8.65, 6,57 and 8.13 gmol/L, respectively, and displayed weak cytotoxicity on the normal cell(HEK-293). Furthermore, screening of PD-1 /PD-L1 inhibitory activity revealed that compound llo could effectively inhibit the binding of PD-1/PD-L1, and the binding interactions of compound llo with PD-L1 protein were explored by molecular docking. All above evidences showed that compound llo might be worthy of further study as a valuable leading compound for the treatment of cancer.     

Synthesis and Anti-leukemia Evaluation of Tetrahydro-4H-pyrano[3,2-c]pyridines and Corresponding Anti-CD14 Monoclonal Antibody Conjugates

A series of novel tetrahydro-4H-pyrano[3,2-c]pyridines（3a-3p） were synthesized and found to possess potent antiproliferative activity against leukemia K562 cells in vitro. Preliminary bioassay indicates that compounds 3a and 3e afford the best activity, the IC50 values of them were 6.93 and 7.51μg/mL, respectively, which were lower than that of the anticancer drug 5-FU（1C50=8.56μg/mL）. To reduce the toxicity of compounds 3a-3p to the prolife- ration of normal bematopoietic cells, a tumor targeted CD14 monoclonal antibody（McAb） was used in conjugation with compounds 3a--3p to get conjugates 4a--4p, respectively. The inhibitory activities of conjugates 4a--4p toward K562 cells were discovered to approach those of compounds 3a--3p. In the presence of CD14 McAb, tumor cells were found to be much more susceptible to conjugates 3a--3p than normal hematopoietic cells. Therefore, the toxicity of conjugates 4a--4p to normal hematopoietic cells declined obviously. For example, as for the toxicity of compound 3a compared with that of compound 4a, the value of ICs0 increased from 35.90 μmol/L to 39.52 μmol/L.