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以二茂铁二甲酸为原料,经酯化、部分水解、与叠氮化钠反应、在叔丁醇中发生Curtius重排得到11-甲酸甲酯-1-叔丁氧胺基二茂铁(5),5经三氟乙酸脱保护、与(z)-2-苯基-4-苯甲基噁唑-5-酮反应,合成了含α,β-不饱和氨基酸残基的二茂铁-肽缀合物CH3O-Fc-NH-APhe-COPh (7) (△Phe为α,β-不饱和苯丙氨酸).用红外、核磁、质谱和元素分析对其结构进行鉴定和表征.用循环伏安(CV)法对产物的电化学性能进行研究,结果表明化合物7的氧化峰和还原峰的电位分别为0.802和0.714 V,峰电位之差△Ep为88 mV,峰电流密度之比Jpa/Jpc为1.06.用荧光光谱研究了近生理条件下化合物7与牛血清白蛋白(BSA)的相互作用,结果表明化合物7与BSA间的相互作用为静态猝灭过程,反应结合位点数为0.93,结合常数为3.8×104 L·mol-1. 相似文献
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以香叶木素或野漆树苷为原料,经过O-甲基化、酸性水解、O-苄基化和过氧丙酮(DMDO)氧化等反应步骤,合成了5,7,3’,4’-四甲氧基黄酮醇(1),5,7,3’-三苄氧基-4’-甲氧基黄酮醇(2),5,7,4’-三甲氧基黄酮醇(3),金合欢素(4)和5,7-二羟基-4’-苄氧基黄酮(5),运用"点击化学"方法,将所合成黄酮类的炔基化合物6~10与β-叠氮化乙酰基半乳糖通过铜催化的1,3-偶极环加成反应链接起来,合成了一系列未见文献报道的新型黄酮半乳糖缀合物11~20.MTT蛋白染色法体外抗肿瘤细胞生物活性测试发现,化合物11,13和20对白血病细胞(HL-60)、肝癌细胞(SMMC-7721)、乳腺癌细胞(MCF-7)、结肠癌细胞(SW480)和肺癌细胞(A-549)具有一定的抑制活性. 相似文献
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报道了甘油脂与Germatranes缀合物的合成,合成中以DCC为缩合剂,以吡啶为催化剂,经缩合反应得到目标产物,对缩合方法和反应条件进行了探讨,化合物结构经HNMR、IR和元素分析确证。 相似文献
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以二茂铁二甲酸为原料,经酯化、部分水解、与叠氮化钠反应、在叔丁醇中发生Curtius重排得到1’-甲酸甲酯-1-叔丁氧胺基二茂铁(5),5经三氟乙酸脱保护、与(Z)-2-苯基-4-苯甲基噁唑-5-酮反应,合成了含α,β-不饱和氨基酸残基的二茂铁-肽缀合物CH3O-Fc-NH-ΔPhe-COPh(7)(ΔPhe为α,β-不饱和苯丙氨酸).用红外、核磁、质谱和元素分析对其结构进行鉴定和表征.用循环伏安(CV)法对产物的电化学性能进行研究,结果表明化合物7的氧化峰和还原峰的电位分别为0.802和0.714 V,峰电位之差ΔEp为88 mV,峰电流密度之比Jpa/Jpc为1.06.用荧光光谱研究了近生理条件下化合物7与牛血清白蛋白(BSA)的相互作用,结果表明化合物7与BSA间的相互作用为静态猝灭过程,反应结合位点数为0.93,结合常数为3.8×104L mol-1. 相似文献
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基于具有三元环状结构的化合物的广泛生理活性和氟尿嘧啶的抗癌作用机制,本文设计、合成并表征了一系列新型5-氟尿嘧啶(5-FU)的三元碳环缀合物及三元氧杂环缀合物。并对5-FU 的N-1和N-3位的选择性烷基化方法进行了系统研究,发现苄氧甲酰氧甲基保护基具有稳定性高、有效保护性好、制备方便、易于脱除等特点,适宜于在本类反应中应用。测试了所合成的新型5-FU三元环缀合物的体外抗肿瘤活性,化合物7、8、12、13显示了对人食管癌细胞Ec9706不同程度的抑制活性。 相似文献
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尿苷环甘油磷脂缀合物的合成 总被引:1,自引:0,他引:1
报道尿苷2-烷基(酰基)-1,3-甘油硫代环磷酸酯的合成,用碘活化的六乙基亚磷酰三胺作为磷酸化试剂,分离得到了硫代环磷酸酯的两个顺反异构体。初步生物活性测试结果表明,该化合物具有一定的细胞毒性。 相似文献
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甾体化合物是一类生物体中广泛存在并起重要功能的生物分子。其特殊结构使这类化合物具有亲脂性,膜亲合性以及与低密度脂蛋白的特异性结合等性能。利用这些特性设计合成各种药物分子的甾体缀合物,可增加药物分子的脂溶性,提高跨膜渗透能力,在特定组织中的分布以及甾体缀合物自身具有独特的生物活性,对探索新型生物活性分子具有重要意义。本文介绍了近年来在设计合成新型甾体缀合物领域的研究进展,包括甾体药物缀合物、含磷甾体缀合物、作为离子通道和分子载体的缀合物及甾体二聚缀合物等。 相似文献
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Oligonucleotides modified by a 2′-deoxy-2′-(N-methoxyamino) ribonucleotide react readily with aldehydes in slightly acidic conditions to yield the corresponding N-(methoxy)oxazolidine-linked oligonucleotide-conjugates. The reaction is reversible and dynamic in slightly acidic conditions, while the products are virtually stable above pH 7, where the reaction is in a ‘‘switched off-state’’. Small molecular examinations have demonstrated that aldehyde constituents affect the cleavage rate of the N-(methoxy)oxazolidine-linkage. This can be utilized to adjust the stability of this pH-responsive cleavable linker for drug delivery applications. In the present study, Fmoc-β-Ala-H was immobilized to a serine-modified ChemMatrix resin and used for the automated assembly of two peptidealdehydes and one aldehyde-modified peptide nucleic acid (PNA). In addition, a triantennary N-acetyl-d-galactosamine-cluster with a β-Ala-H unit has been synthesized. These aldehydes were conjugated via N-(methoxy)oxazolidine-linkage to therapeutically relevant oligonucleotide phosphorothioates and one DNA-aptamer in 19–47% isolated yields. The cleavage rates of the conjugates were studied in slightly acidic conditions. In addition to the diverse set of conjugates synthesized, these experiments and a comparison to published data demonstrate that the simple conversion of Gly-H to β-Ala-H residue resulted in a faster cleavage of the N-(methoxy)oxazolidine-linker at pH 5, being comparable (T0.5 ca 7 h) to hydrazone-based structures. 相似文献
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Dr. Chenguang Lou Josephine Tuborg Boesen Dr. Niels Johan Christensen Dr. Kasper K. Sørensen Prof. Peter W. Thulstrup Dr. Martin Nors Pedersen Prof. Ernest Giralt Prof. Knud J. Jensen Prof. Jesper Wengel 《Chemistry (Weinheim an der Bergstrasse, Germany)》2020,26(25):5676-5684
DNA nanostructures have been designed and used in many different applications. However, the use of nucleic acid scaffolds to promote the self-assembly of artificial protein mimics is only starting to emerge. Herein five coiled-coil peptide structures were templated by the hybridization of a d -DNA triplex or its mirror-image counterpart, an l -DNA triplex. The self-assembly of the desired trimeric structures in solution was confirmed by gel electrophoresis and small-angle X-ray scattering, and the stabilizing synergy between the two domains was found to be chirality-independent but orientation-dependent. This is the first example of using a nucleic acid scaffold of l -DNA to template the formation of artificial protein mimics. The results may advance the emerging POC-based nanotechnology field by adding two extra dimensions, that is, chirality and polarity, to provide innovative molecular tools for rational design and bottom-up construction of artificial protein mimics, programmable materials and responsive nanodevices. 相似文献
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Several peptide-oligonucleotide and peptide-(oligonucleotide phosphorothioate) conjugates were synthesized on new solid supports. These supports are designed to link the 3′-terminus of an oligonucleotide to the C-end of a peptide via a phosphodiester or phosphorothioate bond in the process of stepwise solid-phase assembly. 相似文献
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Dr. Kaveh Matinkhoo Antonio A. W. L. Wong Dr. Chido M. Hambira Brandon Kato Charlie Wei Dr. Christoph Müller Dr. Torsten Hechler Dr. Alexandra Braun Dr. Francesca Gallo Dr. Andreas Pahl Prof. David M. Perrin 《Chemistry (Weinheim an der Bergstrasse, Germany)》2021,27(40):10282-10292
Alpha-amanitin, an extremely toxic bicyclic octapeptide extracted from the death-cap mushroom, Amanita phalloides, is a highly selective allosteric inhibitor of RNA polymerase II. Following on growing interest in using this toxin as a payload in antibody-drug conjugates, herein we report the synthesis and biochemical evaluation of several new derivatives of this toxin to probe the role of the trans-hydroxyproline (Hyp), which is known to be critical for toxicity. This structure activity relationship (SAR) study represents the first of its kind to use various Hyp-analogs to alter the conformational and H-bonding properties of Hyp in amanitin. 相似文献
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发展位点特异且具有明确拓扑结构的蛋白质-高分子偶联物是高分子和化学生物学领域共同面对的挑战之一.在聚合物末端精确引入一个或多个具有特殊反应活性的生物正交官能团是实现位点特异生物偶联的关键前提.这一过程通常比较低效、需要多步骤的官能团转化、聚合后修饰以及保护脱保护,费时且繁琐.最近,通过在聚合过程中原位生成官能团,以一锅-两步的过程得到可直接用于蛋白质偶联的异遥爪聚合物,从而实现了多种不同拓扑结构的蛋白质-聚氨基酸偶联物的快速构筑.这一简洁的合成路线实现了以前尚未获得的头-尾相接的环状偶联物的制备,使这些偶联物表现出了很强的体外酶稳定性以及热稳定性.该工作是蛋白质-高分子偶联化学的一次创新的尝试;同时,利用该方法所制备的偶联物在蛋白质药物领域具有广阔的应用前景. 相似文献
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Dr. Dieter Verzele Dr. Yara Ruiz García Prof. Dr. Annemieke Madder 《Chemistry (Weinheim an der Bergstrasse, Germany)》2020,26(21):4701-4705
Handling of the individual fragments remains a bottleneck in the convergent assembly of peptides. Overlooked since the emergence of ligation chemistries during the past two decades, so-called resin-to-resin transfer reactions (RRTR) are here described as a strategic shortcut in this context. Condensation of the involved moieties at an acceptor resin is facilitated by shuttling peptide segments directly from a donor resin in a one-pot fashion. The straightforward synthesis of a sterically constrained 13-mer peptidosteroid model illustrates the utility of this approach, presenting the first successful application of the RRTR methodology in the field of multivalent design and bioconjugation. Relying on established procedures to generate, monitor and isolate intermediates and products, the solid-phase nature of the entire strategy allows for the fast construction of polypeptide adducts and libraries thereof. As such, a rejuvenated use and new opportunities for RRTR are reported. 相似文献