木豆素衍生物的合成及抗肿瘤活性研究

目的设计并合成新型木豆素衍生物,研究其体外抗肿瘤活性和对ERα蛋白表达水平的影响。方法通过Horner-Wadsworth-Emmons反应、选择性去甲基反应、异戊烯基化反应等得到目标化合物;采用MTT法测试目标化合物对人结肠癌细胞HT-29、人乳腺癌细胞MCF-7和人卵巢畸胎瘤细胞PA-1的体外抗增殖活性,采用Western blot实验检测部分化合物对MCF-7细胞ERα蛋白表达水平的影响。结果与结论共合成23个木豆素衍生物,其中,18个化合物未见文献报道,目标化合物的结构经~1H-NMR、~(13)C-NMR谱和高分辨质谱确证。目标化合物的体外抗肿瘤细胞增殖测试结果表明,受试化合物对PA-1细胞的抑制活性明显强于对HT-29和MCF-7细胞。其中,B环引入羟基的衍生物对3种测试细胞株均有较好的抑制活性,且与木豆素和他莫昔芬相比,化合物11下调ERα蛋白表达水平作用更明显,值得进一步深入研究。     

β-锗代-α-氨基酸衍生物的合成及抗肿瘤活性

自六十年代初期发现羧乙基锗倍半氧化物(Ge—132)广泛的生物活性以来,已有许多相应的有机锗化合物被发现,在抗肿瘤活性方面,因有毒性较低、抗瘤谱广等一系列优点而引起人们广泛的兴趣,但由于活性较低影响了应用及发展,据文献报道,有机锗倍半氧     

Synthesis and antitumor activity evaluation of novel ursolic acid derivatives

Eleven novel ursolic acid (UA) derivatives were designed and synthesized with modification at positions of C-2, C-3, and C-28 of UA. Their structures were confirmed by MS, ¹H NMR, and elemental analysis. Their in vitro cytotoxicities against various cancer cell lines (HeLa, HepG2, and BGC-823) were evaluated by MTT assay. The results indicated that all compounds could inhibit cell proliferation of HeLa, HepG2, and BGC-823 cells. Among them, compounds I₃ and I₄ showed more potent cytotoxicity on these three tumor cells than gefitinib (positive control), worthy to be studied further.     

积雪草酸衍生物的合成及体外抗肿瘤活性研究

目的设计合成积雪草酸衍生物并检测其体外抗肿瘤活性。方法采用计算机辅助药物设计的方法设计并筛选目标化合物的结构;以天然产物积雪草酸为起始原料,对其C-2、C-3、C-23位羟基以及C-28位羧基进行结构改造;采用MTT法测试目标化合物对人肝癌细胞(HepG2)和人肺癌细胞(A549)的体外抗肿瘤活性。结果目标化合物对这两种细胞株的抑制活性均优于母体积雪草酸,其中化合物Ⅰ_8和Ⅱ_2表现出较强的抗肿瘤活性,且分子对接模拟也显示化合物Ⅰ_8和Ⅱ_2与Survivin蛋白的结合力较强。结论经结构改造后的积雪草酸衍生物具有一定的抗肿瘤活性,值得进一步研究。     

Investigation of the antitumor activity of podocarpic acid derivatives

As a class, octahydrophenanthrene lactones, podolactones , and related podocarpic acid derivatives have been reported to possess a wide variety of biological activities, including antileukemic activity, inhibition of plant cell growth, and hormonal and anti-inflammatory properties. In the present study, a series of synthetic intermediates derived from podocarpic acid have been prepared and evaluated with respect to their ability to inhibit human epidermoid carcinoma of the nasopharynx in vitro. The significant cytotoxicity demonstrated by methyl 6 alpha-bromo-7-oxo-O- methylpodocarpate (50% inhibition of cells at 8.85 X 10(-9) M) was markedly higher than that of the other derivatives examined. Further evaluation against L1210 and P388 lymphoid leukemias in mice failed to demonstrate significant antitumor activity.     

Synthesis and antitumor activity evaluation of novel oleanolic acid derivatives

Ten novel oleanolic acid (OA) derivatives were synthesized through modifications at positions of A ring and C-28. Inhibitory activities of the oleanolic acid derivatives against SGC7901 and A549 cell lines were evaluated and confirmed by the tetrazolium bromidesalt (MTT) assay. The lab results revealed that all these compounds displayed some antitumor activity against SGC-7901 and A-549 cell lines. Among them, II₄ and II₅ exhibited excellent antitumor activities against SGC7901 cells and A549 cells, compared with gefitinib. Molecular docking studies have shown that compounds II₄ and II₅ produce potent antitumor activities by interacting with C-kit receptor through hydrogen bonds and hydrophobic bonds.     

New compounds: peptide derivatives of the antitumor agent N-phosphonoacetyl-L-aspartic acid

Two peptide forms of the antitumor transition state analogue N-phosphonoacetyl-L-aspartic acid (N2-phosphonoacetyl-N4-glycylglycinamidoethyl-L-asparagine and N1-glycylglycinamidoethyl-N2-phosphonoacetyl-L-isoasparagine ) have been synthesized to obtain potential medicinal agents useful as prodrugs or in a lysosomotropic carrier approach. The bridging unit, ethylenediamine, used for synthetic purposes might be of general interest.     

Anti-inflammatory activity of some novel alpha-amino naphthalene derivatives

alpha-Acetylamino naphthalene (1) was reacted with different aromatic aldehydes and with primary or secondary amines to give alpha-aminonaphthylsubstitutedaryl chalkones (2-5) and alpha-(substituted aminoethyl)-amidonaphthalenes (14-25), respectively. These substituted chalkones were treated with hydrazinehydrate and hydroxylamine hydrochloride to give 1-acetyl-5-substitutedaryl-3-(alpha-aminonaphthyl)-2-pyrazolines (6-9) and alpha-(2-substitutedaryl-isoxazolin-4-yl)-aminonaphthalenes (10-13), respectively. Their chemical structures were confirmed by IR and 1H-NMR spectral data and elemental analysis. Studies of the anti-inflammatory and ulcerogenic activities and acute toxicity of these newly synthesized compounds were performed in vivo and compared with the standard drug, phenylbutazone (CAS 50-33-9). Some of these compounds showed potent anti-inflammatory activity and less ulcerogenic effects than phenylbutazone.     

Design,synthesis, and antitumor activity of oleanolic acid derivatives

Using the techniques of computer-aided drug design, the docking of survivin and known active small molecules was simulated and then the key amino acid residue fragments of the target protein were analyzed. It led to the discovery of active groups capable of binding to the critical sites. Through the use of the natural product, oleanolic acid, as a lead compound, the introduction of the active groups onto the A-ring, and the modification of the carboxyl group at the C-28 position using esterification or amidation, 20 new oleanolic acid derivatives had been designed and synthesized. HepG2 and SGC-7901 cells were used to screen the antitumor activity through the standard MTT method. The compounds, II₃, III₅ and IV_4, exhibited more potent cytotoxicity than positive drugs. Western blot experiment demonstrated that compound II₃ can effectively inhibit the proliferation of HepG2 cells.     

聚乙二醇缀合熊果酸衍生物的合成及体外抗癌活性

目的:合成具有一定水溶性的聚乙二醇(PEG)缀合熊果酸衍生物并考察其体外抗癌活性。方法:以熊果酸(ursolic acid,UA)作为母核,采用PEG、琥珀酸对其C28位进行接合修饰,合成一系列PEG缀合熊果酸衍生物并考察其水溶性和抗癌活性;采用流式细胞术探讨其抗癌机制。结果:所合成系列PEG缀合熊果酸衍生物的水溶性较熊果酸有明显改善,同时具有更显著的体外抗癌活性;化合物8c对5株受试肿瘤细胞的IC50(48 h)均小于10μmol.L-1,将AGS细胞阻滞于G2/M期并具有诱导凋亡作用(凋亡率高于70%)。结论:将熊果酸C28位进行PEG修饰是保持和提高其抗癌活性的有效途径之一。     

土槿乙酸衍生物的合成及其抗肿瘤活性

目的:研究土槿乙酸抗肿瘤作用的构效关系。方法:以土槿乙酸为原料,合成8个土槿乙酸衍生物,其结构经1H-NMR,MS证实。经MTT法筛选了衍生物的抗肿瘤活性。结果:8个化合物均为新化合物,除Ⅱc所有化合物均具有抗肿瘤活性,其中Ⅱf,Ⅱg的抗肿瘤活性显著高于土槿乙酸。结论:某些土槿乙酸酯和酰胺可提高抗肿瘤活性。     

Amino acid derivatives. Part I. Synthesis, antiviral and antitumor evaluation of new alpha-amino acid esters bearing coumarin side chain

A series of amino acid esters bearing coumarin (3-15) were synthesized and evaluated, in vitro, against HIV-1, and bovine viral diarrhea virus (BVDV). The in vitro cytotoxicity of 3-10 and 12 was assayed against a panel of tumor cell lines consisting of CD4 human T-cells. Compound 14 showed inhibition of HIV-1 with EC50 > 1.6 microg mL(-1), meanwhile compound 9 exhibited activity against leukaemia (MT4) with CC50 = 24 micromol L(-1).     

司他夫定衍生物的合成及抗肿瘤活性评价

目的设计合成一系列司他夫定类衍生物,并评价其抗肿瘤活性。方法以司他夫定为原料,经磺酸酯化后与叠氮化钠反应生成5'-叠氮基司他夫定,再通过Huisgen 1,3-偶极环加成反应得到目标化合物。采用MTT法分别以人肝癌细胞(BEL-7402)、人胃癌细胞(BGC-823)、肺癌细胞(A549)为测试细胞株对目标化合物进行体外抗肿瘤活性评价。结果与结论合成了14个5'-脱氧司他夫定衍生物,目标化合物的结构经核磁共振氢谱和碳谱确证。其中化合物4k对人肝癌细胞(BEL-7402)、人胃癌细胞(BGC-823)、肺癌细胞(A549)具有中等的抑制作用。     

羟基胆烷酸类衍生物的抗癌活性研究Ⅱ.3β,5α,6β-三羟基胆甾烷-24-酸及3β,6β-二羟基胆甾-4-烯-24-酸衍生物的合成及其抗癌活性

目的探讨侧链极性的改变对氧代固醇类化合物抗癌活性的影响.方法以去氧猪胆酸为起始原料合成共22个(其中14个未见文献报道)侧链具一定极性、母环结构为3β,5α,6β-三羟基及3β,6β-二羟基-Δ4-烯胆甾-24-酸衍生物,并以3β,5α,6β-三羟基胆甾烷(10)和3β,6β-二羟基胆甾-4-烯(11)为对照,比较其体外抗癌活性.结果与结论少部分化合物的抗癌活性比对照物稍强,大部分基本持平,少部分活性消失.希望从3β,5α,6β-三羟基及3β,6β-二羟基-Δ4-烯胆甾-24-酸衍生物中找到比现有的氧代固醇抗癌活性更强的化合物的设想,目前尚未达到预期目的.     

Morpholinylanthracyclines: cytotoxicity and antitumor activity of differently modified derivatives

Summary The relationship between different chemical modifications on morpholinylanthracyclines and their ability to overcome multidrug resistance (MDR) has been evaluated testing all compounds in vitro on LoVo and LoVo/DX human colon adenocarcinoma cells and in vivo on disseminated P388 and P388/DX murine leukemias.Results obtained led us to the following conclusions: 1) the insertion of the morpholinyl or the methoxymorpholinyl group on position 3 of the sugar moiety confers the ability to overcome MDR in vitro and in vivo; conversely, 4 morpholinyl compounds are effective on MDR cells only in vitro and result inactive in vivo on DX-resistant leukemia; 2) all chemical modifications performed on 3 morpholinyl or methoxymorpholinyl derivatives, that is substitutions on the aglycone or on position 2 of the morpholino ring, do not interfere with the activity of the compounds: all derivatives present in fact the same efficacy on sensitive and resistant models.It is concluded that position 3 in the sugar moiety plays a crucial role in the ability of morpholinylanthracyclines to overcome MDR.     

Synthesis of phosphonic acid and phosphinic acid derivatives for development of biologically active compounds

This paper covers recent publications from our laboratory on the synthesis of a variety of phosphonate and phosphinate derivatives. New methods for the enantioselective synthesis of alpha-hydroxyphosphonates were established by Lewis acid-mediated cleavage of homochiral 1,3-dioxaneacetals with P(OEt)(3) and chiral metal ligand-mediated hydrophosphonylation of aldehydes. Two diastereomers of HPmp derivatives were prepared by an application of these methods. The HPmp derivatives were convered to FPmp derivatives but with low diastereoselectivity. Hydrophosphonylation of alpha-aminoaldehydes afforded threo- and erythro-beta-amino-alpha-hydroxyphosphonates under chelation and nonchelation controlled conditions, respectively. The asymmetric dihydroxylation of alpha, beta-, and beta, gamma-unsaturated phosphonates with AD-mix-alpha and AD-mix-beta reagents gave alpha, beta- and beta, gamma-dihydroxyphosphonates with high enantioselectivity. The method was applied to the kinetic resolution of racemic alpha-oxygetated beta, gamma-unsaturated phosphonates. Treatment of allyloxymethylphosphonates with the base afforded alpha-hydroxyphosphonates via the [2,3]-Wittig reaction. Threo- and erythro-beta-amino-alpha-hydroxyphosphinates were obtained with high diastereoselectivity by phosphinylation of alpha-aminoaldehydes in the presence of (R)- and (S)-ALB, respectively. The phosphinylation of alpha-oxygenated aldehydes afforded the corresponding alpha, beta-dioxygenated phosphinates, but with low diastereoselectivity. Sphingomyelin analogues containing CF(2)PO(OH)(2) were synthesized starting from (S)- and (R)-Garner aldehyde for the purpose of obtaining potent sphyngomyelinase inhibitors. A useful method for the synthesis of alpha, alpha-difluorobenzylphosphonates was established based on the cross coupling reaction of an iodobenzene derivative with ZnCuBr(2)CF(2)PO(OEt)(2). The synthetic utility of ZnCuBr(2)CF(2)PO(OEt)(2) was examined to obtain alpha, alpha-difluoromethylenenphosphonates. The method was applied to a synthesis of PNP-inhibitory active compounds by combination of the purine base and alcohols containing difluoromethylenephosphonate. The methodology for the beta-selective N-glycosylation of 2,3-dideoxy glucoside was established by introducing phosphonothioates at the 3-position of glycosyl doners instead of phosphonate. Synthesis of new acylic nucleotide analogues designed based on the structural modification of ARS2267 is also described. Finally, kiral synthesis of some phosphonates was achieved using lipase through kinetic resolution.     

Synthesis and antitumor activity of new derivatives of xanthen-9-one-4-acetic acid

Xanthen-9-one-4-acetic acid (XAA) analogues in which the substituents in positions 5 and 6 are included in cyclic structures are described. Direct in vitro toxicity of the synthesized compounds against four tumor cell lines was evaluated, and their ability to stimulate mouse peritoneal macrophages and human monocytes in culture to become tumoricidal (indirect toxicity) was also studied. Despite low direct toxicity, almost all the compounds proved to be able to significantly enhance the lytic properties of both murine macrophages and human monocytes as well as the parent compound XAA and its most active derivative DMXAA taken as reference. In particular, compounds 4a, 5a, 7a, 13a,b, and 16a,b showed higher activity than the lead compound on human monocytes, compound 7a being 2.5 times more active than DMXAA, which is the most potent compound synthesized so far. Moreover, compounds 4a, 5a, 7a, 13a, 16a, and 16b proved to be able to induce TNF production in human immune cells.