2-氰基-3-N-烷氨基-3-(N-2-氟苯乙氨基)丙烯酸乙酯类化合物的合成及生物活性研究

把由氰基乙酸乙酯、二硫化碳、硫酸二甲酯在乙醇钠作用下反应得到的2-氰基.3,3-二甲硫基丙烯酸乙酯中间体用邻氟苯乙胺胺化,再和甲胺等烷胺进行胺化反应,合成了含氟2-氰基丙烯酸乙酯类化合物.结构经元素分析、IR、1H NMR、13C NMR等证实,抗烟草花叶病毒(TMV)生物活性的初步测定表明,所合成的化合物有一定抗TMV活性.     

1,2-二[3-(6,8-二叔丁基-3,4-二氢-1,3-苯并(口恶)嗪)基]乙烷的合成及晶体结构

N-取代的3,4-二氢-1,3-苯并(口恶)嗪具有生物活性,是潜在的安定剂和镇静剂,还是制备酚醛树脂的潜在中间体[1-3].一般以酚、伯胺和甲醛为原料,通过Mannish缩合反应来制备[4].本文通过2,4-二叔丁基苯酚、乙二胺和甲醛反应,合成了亚乙基桥联的双(口恶)嗪,X-射线单晶衍射测定了它的晶体结构.     

1，2-二[3-（6，8-二叔丁基-3，4-二氢-1，3-苯并噁嗪）基]乙烷的合成及晶体结构

N-取代的3，4-二氢-1，3-苯并噁嗪具有生物活性，是潜在的安定剂和镇静剂，还是制备酚醛树脂的潜在中间体。一般以酚、伯胺和甲醛为原料，通过Mannish缩合反应来制备。本文通过2，4-二叔丁基苯酚、乙二胺和甲醛反应，合成了亚乙基桥联的双噁嗪，X-射线单晶衍射测定了它的晶体结构。     

新型N-(2'-芳胺嘧啶-4'-基)-N,2,3-三甲基-2H-吲唑-6-胺衍生物的合成及其抗肿瘤活性

以3-甲基-6-硝基-1H-吲唑为原料,经N-甲基化、催化还原、亲核取代及烷基化反应制得关键中间体N-(2'-氯嘧啶-4'-基)-N,2,3-三甲基-2H-吲唑-6-胺(5);5与芳胺经亲核取代反应合成了一系列新型的N-(2'-芳胺嘧啶-4'-基)-N,2,3-三甲基-2H-吲唑-6-胺衍生物,其结构经1H NMR和MS确证。初步生物活性测试结果表明,部分化合物具有明显的抗肿瘤活性。     

2-氰基-3-取代胺基-3-[2-(4-氟苯基)-乙胺基]丙烯酸乙酯类化合物的合成及生物活性研究

以氰基乙酸乙酯为原料,经与二硫化碳、硫酸二甲酯反应合成了2-氰基-3,3-二甲硫基丙烯酸乙酯(1),然后引入对氟苯乙胺得到化合物(3),其与脂肪胺反应合成了新型含对氟苯乙氨基的2-氰基丙烯酸乙酯类化合物5a～5h,其结构经元素分析,IR1H NMR和13C NMR等确证.初步生物活性试验表明,部分化合物具有一定抗烟草花叶病毒活性.     

5-芳基-1,3,4-噻二唑-2-胺衍生物的合成

在冰醋酸催化下,芳香醛(2a～2g)分别和氨基硫脲(3)反应合成得到芳亚胺基硫脲衍生物(4a～4g),中间体4无需经柱层析纯化,然后在三氯化铁作用下反应关环,得到7个目标化合物5-芳基-1,3,4-噻二唑-2-胺(1a～1g).产物结构经1 H NMR、13 C NMR和ESI-MS确证.然后分别以中间体(E)-2-苄...     

色酮-3-甲酸合成研究进展

色酮-3-甲酸是黄酮类天然产物的结构单元,属于苯并吡喃型化合物,具有优良的生物活性,如抗菌、抗病毒、抗癌、抗炎、抗氧化等。分子中C-3位上的羧基具有较强的反应活性,可用于制备醛、酯、酰胺、醇等重要的有机合成中间体物质,是进一步构建复杂分子的重要有机砌块,其合成方法持续受到关注并得到了很大发展。在分析色酮-3-甲酸结构特征的基础上,对其合成方法进行了综述,并预测和讨论了该化合物合成今后的发展方向。     

1-(5-二茂铁基-1,3,4-噻二唑-2-基)哌啶-2-酮的合成及表征

本文报道1-(5-二茂铁基-1,3,4-噻二唑-2-基)哌啶-2-酮(1)的合成。首先,在乙酸催化下,二茂铁甲醛(2)和氨基硫脲(3)反应得到二茂铁亚胺基硫脲衍生物(4)。然后,在三氯化铁作用下,中间体4发生关环反应得到5-二茂铁基-1,3,4-噻二唑-2-胺(5)。中间体5再与5-溴戊酰氯(6)发生N-酰基化反应得到5-溴-N-(5-二茂铁基-1,3,4-噻二唑-2-基)戊酰胺(7)。最后,在碱性条件下,中间体7发生分子内关环反应得到目标化合物(1)。中间体及产物结构经¹H NMR、¹³C NMR和ESI-MS表征,产物1结构进一步通过X-单晶衍射确证。然后分别考察了中间体5及产物1收率的主要影响因素,确定中间体5合成的适宜条件为：三氯化铁的用量为n(三氯化铁)∶n(中间体4)=4∶1,反应温度80℃,反应时间为15 h,在该条件下,中间体5的收率达到61.9%;确定产物1合成的适宜条件为：反应溶剂为二氧六环,物料比为n(DIEA)∶n(6)∶(5)=3.0∶1.2∶1.0、反应温度为80℃,反应时间为4 h,在该条件下,产物1收率达到68...     

9-羟基-9-呫吨羧酸甲酯和中间体的合成

9-羟基-9-咕吨羧酸甲酯是合成咕吨类抗胆碱能药物的一种重要的中间体.本文以9-咕吨羧酸为原料,通过微波催化先合成了中间体9-咕吨羧酸甲酯,然后很简便地得到了9-羟基-9-咕吨羧酸甲酯.在中间体的合成中,利用正交设计,探讨了微波辐射时间、功率以及催化剂用量对反应的影响,实验结果表明微波辐射时间的影响最为显著.     

N-取代-α-氧代环十二烷基磺酰胶的合成及其杀菌活性

以易得的环十二酮为原料，由磺化获得中间体α-氧代环十二烷基磺酸后，再经生成磺酰、氯和胺化反应合成了一系列N-取代-α-氧代环十二烷基磺酰胺（Ⅲ）．生物活性测定结果表明，它们对小麦赤霉病菌（Gibberellazeae）的生长具有抑制作用，其中活性最高的是氮上取代有一氯苯基的化合物（Ⅲ7、Ⅲ8），通过构象分析讨论了它们的结构-活性关系．     

Comparison of the use of single capillaries and coupled capillaries based on micellar electrokinetic chromatography (MEKC) and sweeping-MEKC modes

The use of single capillaries (25 and 50 microm inner diameter (ID)) and coupled capillaries of different diameters (100-50 and 75-25 microm ID) based on micellar electrokinetic chromatography (MEKC) and sweeping-MEKC modes is compared and reported. Naphthalene-2,3-dicarboxaldehyde (NDA)-derivatized dopamine was selected as the model compound by examining the fluorescence intensity when a violet (410 +/- 7 nm, 2 mW) light-emitting-diode (LED) was used as the light source. When a single capillary (50 microm ID) was used, the detection limit for NDA-derivatized dopamine was determined to be 2.0 x 10(-7) M (Signal-to-nose ratio S/N = 3) based on the MEKC mode. This was improved to 4.0 x 10(-9) M when the sweeping-MEKC mode was applied. In addition, this can be further improved to 1.0 x 10(-9) M and 5.6 x 10(-10) M when 100-50 and 75-25 microm ID coupled capillaries are used. The use of the coupled capillary is also helpful for improving the separation efficiency. Based on the sweeping-MEKC mode, the number of theoretical plates (N) for the detected peaks were determined to be 6.3 +/- 2.7 x 10(5) by means of a single capillary (50 microm ID). This can be improved to 9.4 +/- 3.6 x 10(5) and 9.4 +/- 0.9 x 10(6) when the 100-50 and 75-25 microm ID coupled capillaries were applied.     

Assessment of the bioactive compounds,antioxidant and antibacterial activities of Isodon rubescens as affected by drying methods

The influence of natural drying (ND), hot-air drying (HD), vacuum drying (VD), infrared drying (ID) and freeze drying (FD) on bioactive compounds and bioactivities of Isodon rubescens (Hemsl.) was investigated in this study. The results showed that different drying methods resulted in the differences in bioactive compositions’ content, antioxidant and antibacterial activities of extracts from I. rubescens. FD sample possessed the highest content of total phenolics, total flavonoids and several main phenolic compounds, as well as the stronger antioxidant and antibacterial activities, followed by ND, HD and VD, the lowest for ID samples. For this reason, freeze drying would seem to be more advisable for the drying I. rubescens, and future studies could focus on the quality evaluation and optimising various drying parameters.     

乙酰胆碱酯酶AChE与1,7-二氮杂咔唑抑制剂的作用机理的分子动力学模拟

通过分子对接、分子动力学(MD)模拟以及成键自由能分析方法,从原子水平上模拟研究了3种1,7-二氮杂咔唑衍生物(分别记为M1、M2和M3)与ACh E的结合模式及相互作用机理,分析和讨论了研究体系的静电相互作用和范德华相互作用(vd W)。用MM-PBSA方法计算的3种抑制剂与ACh E之间的结合自由能与抑制剂的实验生物活性数据(IC50值)相对应。分析结果表明,残基S286与抑制剂之间形成的氢键作用有利于抑制剂与ACh E之间的结合。范德华相互作用,尤其是抑制剂与关键残基W279和Y334的作用,对抑制剂与ACh E之间的结合自由能有较大的贡献,在区分抑制剂M1(或M2)和M3的生物活性上发挥着重要的作用。     

乙酰胆碱酯酶AChE与1,7-二氮杂咔唑抑制剂的作用机理的分子动力学模拟

通过分子对接、分子动力学（MD）模拟以及成键自由能分析方法,从原子水平上模拟研究了3种1,7-二氮杂咔唑衍生物（分别记为M1、M2和M3）与AChE的结合模式及相互作用机理,分析和讨论了研究体系的静电相互作用和范德华相互作用（vdW）。用MM-PBSA方法计算的3种抑制剂与AChE之间的结合自由能与抑制剂的实验生物活性数据（IC₅₀值）相对应。分析结果表明,残基S286与抑制剂之间形成的氢键作用有利于抑制剂与AChE之间的结合。范德华相互作用,尤其是抑制剂与关键残基W279和Y334的作用,对抑制剂与AChE之间的结合自由能有较大的贡献,在区分抑制剂M1（或M2）和M3的生物活性上发挥着重要的作用。     

N-[2-(4-吗啉基)乙基]苯甲酰胺类单胺氧化酶抑制剂的合成及其生物活性研究

以取代苯甲酸为原料,经缩合反应制得N-(2-溴乙基)苯甲酰胺类化合物(4a~4i);4a~4i经N-烷基化反应合成N-[2-(4-吗啉基)乙基]苯甲酰胺类化合物(1a~1i),其结构经~1H NMR,~(13)C NMR,MS和元素分析表征。并对其生物活性进行了初步实验。实验结果表明:1a~1i对单胺氧化酶(MAO-A)有良好的抑制作用,其中1a最好,当IC50=3.652μmol·L~(-1)时,SI=42.32。     

3-氰基-2-羟基吡啶磷酸酯的合成

β-酮醛和氰乙酰胺在碱的作用下环化得到3-氰基-2-羟基吡啶,用亚磷酸二乙酯在Atherton-Todd条件下磷酰化可以高产率得到3-氰基-2-羟基吡啶磷酸二乙酯,这些化合物显示了一定的生物活性,并可用于磷酸酯酶抑制剂的活性结构的设计。     

具有生物活性的4-色满酮衍生物的合成进展

4-色满酮衍生物在自然界中广泛存在,大多数都具有生物活性。具有生物活性的4-色满酮衍生物又大多具有手性,尤其C2位置。有关它们的不对称合成引起了有机合成工作者的广泛关注。C2(手性)-4-色满酮衍生物合成的关键是C2手性中心的控制合成。本文根据4-色满酮衍生物构建方式的不同进行分类,概述了近十几年来合成C2(消旋或手性)4-色满酮衍生物的最新方法, 侧重讨论了合成立体结构专一的C2(手性)-4-色满酮的反应特点。     

Syntheses and biological evaluation of vinblastine congeners

Sixty-two congeners of vinblastine (VLB), primarily with modifications of the piperidine ring in the carbomethoxycleavamine moiety of the binary alkaloid, were synthesized and evaluated for cytotoxicity against murine L1210 leukemia and RCC-2 rat colon cancer cells, and for their ability to inhibit polymerization of microtubular protein at < 10(-6) M, and for induction of spiralization of microtubular protein, and for microtubular disassembly at 10(-4) M concentrations. An ID50 range of >10(7) M concentrations was found for L1210 inhibition by these compounds, with the most active 1000x as potent as vinblastine.     

Selenium containing macrocycles:transformation between Se-N/Se-S/Se-Se bonds

Macrocycles possess potential applications in supramolecular chemistry and biosystems.Thus development of new kinds of macrocycles is of significance.Herein,novel macrocycles containing Se-Se/Se-S bonds were synthesized via transformation between selenium related dynamic covalent bonds.A monomer containing two ebselen moieties was synthesized(M1).The Se-N bonds in M1 were reduced by dithiothreitol,forming Se-S linked dimer(D1).To realize the transformation from Se-S bonds to Se-Se bonds,guest molecules were added as template,triggering the formation of Se-Se linked dimer(D2).The formation of these two new kinds of macrocycles was determined by ~1H NMR and ~(77)Se NMR,and the necessity of guest molecules was also confirmed.The introduction of ebselen moieties and Se-S bonds or Se-Se bonds into macrocycles may endow it with new responsiveness and bioactivities,as well as new types of host-guest chemistry.     

Synthesis of phosphaisoquinolin-1-ones by Pd(II)-catalyzed cyclization of o-(1-alkynyl)phenylphosphonamide monoesters

A Pd(II)-catalyzed intramolecular cyclization of o-(1-alkynyl)phenylphosphonamide monoethyl esters was examined, and a new class of six-membered phosphorus heterocycles (phosphaisoquinolin-1-ones) were formed with high regioselectivity and good yields. The present reaction is the first example of intramolecular addition of P-NH to substituted alkynes, which provides a valuable way to synthesize novel phosphorus heterocycles with potential bioactivities.