共查询到20条相似文献,搜索用时 58 毫秒
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OSW-1是一种高效的抗癌天然产物,也是当今抗癌药物研究的热点之一。本文简要概括了近年来该药物的主要合成方法,并初步探讨了其工业生产的可行性。 相似文献
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以3,5-二甲氧基苯甲醛、对甲氧基苄醇为原料,经合成硫醚和砜的中间产物,再利用Ramberg-Backlund反应将砜转化为反式碳碳双键,最后脱去甲基获得白藜芦醇。研究探讨了反应条件对硫醚氧化和对Ramberg-Backlund反应的影响。结果表明,在以H2O2-SeO2为氧化剂,CH3OH为溶剂的条件下,硫醚的氧化效果最佳,砜的产率可达82%;在以CCl4-KOH作为卤化试剂,V(正丁醇)∶V(水)=6∶1的正丁醇-水作为溶剂的条件下,Ramberg-Backlund反应的效果最好,反式双键产物的产率为84%。该合成路线总产率为41%。产物及各中间体的结构经1H(13C)NMR、IR和ESI-MS确证。 相似文献
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以D-苯丙氨酸和D-亮氨酸为起始原料,采用液相合成法,经典的"3+2"合成策略,通过对氨基酸N端的保护及脱保护、C端的脱保护、氨基酸的甲基化、缩合等步骤,以混合缩合试剂DEPBT/HATU/TBTU关环,合成了两个环五肽HW-1和HW-2,化合物结构通过1HNMR,13CNMR,MS和ICP-MS进行表征。采用MTT法对目标产物HW-1和HW-2进行抗肿瘤活性筛选,结果显示其具有良好的活性,尤其对Hep G2的IC50值分别为3.14和9.2 mg/L。 相似文献
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简要介绍了Alder烯反应及其在有机合成中的应用.着重介绍了烯反应在天然产物合成中的应用。 相似文献
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Aqueous solutions of fulvic acid have been ozonated under simulated water treatment plant conditions and the oxidation products identified by gas chromatography–mass spectrometry. The predominant oxidation products include numerous alkyl phthalates, mono– and di–carboxylic aliphatic acids and a few cyclic keto–compounds. Ozonation of high–fuivic creek water gave many similar products. The significance of these compounds in finished drinking water is briefly discussed. 相似文献
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1—氯甲基杂氮硅三环的合成 总被引:1,自引:0,他引:1
1-氯甲基杂氮硅三是一种在医药,农业等领域具有良好市场前景的化合物。采用氯甲基三乙氧基硅烷与三乙醇胺在碱催化下全成的方法,并对合成工艺进行优化实验研究。 相似文献
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Zhiyong Chi Xueling Ma Guofeng Cui Mingchao Li Fuchun Li 《International journal of molecular sciences》2013,14(8):15827-15837
Astrocytes are important for protecting neurons in the central nervous system. It has been reported that some antioxidants could protect astrocytes from ischemia/reperfusion-induced dysfunction. Cinnamtannin B-1 is a naturally occurring A-type proanthocyanidin that exhibits anti-oxidant properties. In this study, we investigated the effects of cinnamtannin B-1 on spinal cord astrocytes. Astrocytes were subjected to oxygen-glucose-serum deprivation for eight hours followed by reoxygenation with or without cinnamtannin B-1. We found that cinnamtannin B-1 protected astrocytes from oxygen-glucose-serum deprivation and reoxygenation-induced apoptosis. Concurrently, cinnamtannin B-1 promoted the proliferation of astrocytes whereas the extracellular regulated protein kinase (ERK) inhibitor reversed this effect. The results indicated that cinnamtannin B-1 protects astrocytes from oxygen-glucose-serum deprivation/reoxygenation-induced apoptosis by promoting astrocyte proliferation via an ERK pathway. Therefore, as an anti-oxidant, cinnamtannin B-1 might provide extra benefit for astrocyte protection during ischemia/reperfusion in the central nervous system. 相似文献
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1-溴-5-苯基-四氮唑的合成 总被引:1,自引:0,他引:1
以苯甲腈、叠氮钠、溴等为原料,经偶合,溴化合成了1-溴-5-苯基四氮唑。研究了反应时间、反应温度、溶剂与反应物配比对产品收率的影响。实验表明:在n(苯甲腈)∶n(叠氮钠)=1∶1.1,1 mol NH4Cl催化,120℃下反应20 h可得到收率90%的5-苯基四氮唑。在n(5-苯基四氮唑)∶n(溴)∶n(氢氧化钠)=1∶0.97∶0.96,反应4 h,水作溶剂的条件下,可得到56.4%的1-溴-5-苯基四氮唑,两步反应后的总收率为49.1%。 相似文献
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