手性N-苄氧甲酰基氨基酸芳基酯的合成及其生物活性

在三氯氧磷和吡啶的作用下,N-苄氧甲酰氨基酸和酚发生缩合反应生成了一系列N-苄氧甲酰氨基酸芳基酯(5和6),产率60.7%～76.9%,其结构经1H NMR,13C NMR和IR表征.初步的生物活性结果表明,5和6的杀虫活性较低.     

N-(5-邻氯苯基-2-呋喃甲酰氨基)丙氨酰胺衍生物的合成和 生物活性测定

以5-邻氯苯基-2-呋喃甲酰氯和丙氨酸为起始原料, 通过非均相法得到N-(5-邻氯苯基-2-呋喃甲酰氨基)丙氨酸, 再与10种不同取代苯胺反应, 通过N,N’-二环己基碳二亚胺和4-二甲氨基吡啶(DCC/DMAP)偶合法设计合成了10个未见文献报道的N-(5-邻氯苯基-2-呋喃甲酰氨基)丙氨酰胺类衍生物4a～4j. 通过元素分析, 1H NMR, IR 和MS确定化合物的结构, 初步生物活性测试表明标题化合物具有一定的除草活性.     

一类新型取代乙炔化合物的合成及表征

用二环己基碳酰亚胺(DCC)和N,N-二甲基吡啶(DMAP)催化法合成了系列功能取代乙炔;与酸催化等法进行比较,DCC／DMAP催化法具有反应条件温和、产率高的优点;用元素分析,IR,^1H NMR和DSC等对它们的结构进行了表征和确认。     

含2-(取代苯基)噁唑基的邻甲酰胺基苯甲酰胺类化合物合成及杀虫活性研究

为了研究邻甲酰胺基苯甲酰胺类化合物的杀虫活性,总结该类化合物的构效关系、合成高活性化合物,以2-氨基-3-羟基丙酸与取代2-硝基苯甲酸为原料,经过酯化反应、缩合反应、硝基还原反应、三光气缩合反应等一系列步骤,合成了29个2-(取代苯基)噁唑基的邻甲酰胺基苯甲酰胺类目标化合物,产率在30%~50%之间.根据离体杀东方粘虫活性测定实验结果可知,该类化合物对东方粘虫表现出一定的杀虫活性,其中目标化合物2-(2-溴苯基)-N-(4-氯-2-甲基氨基甲酰基-6-甲基苯基)噁唑-4-甲酰胺(11p)活性最高.通过对目标化合物的结构与杀虫活性的分析,总结出该类化合物的构效关系,筛选出了较高活性的目标化合物.     

N-芳基-4-(吡啶-2-基)-5-(1H-1,2,4-三唑-1-基)噻唑-2-胺衍生物的合成及生物活性研究

利用Hantzsch反应合成了13个N-芳基-4-(吡啶-2-基)-5-(1H-1,2,4-三唑-1-基)噻唑-2-胺衍生物,所有化合物的结构均经1H NMR,MS及元素分析确证.研究发现,溶剂对不同取代基的目标化合物的合成影响很大.生物活性测试结果表明,化合物均具有一定的杀菌活性.其中,化合物6c对番茄早疫和苹果轮纹、化合物6g对番茄早疫、化合物6h对黄瓜黑腥及化合物6i对苹果轮纹均显示80%以上的杀菌活性.     

胆酸酰氧基膦酸酯衍生物的合成及抗肿瘤活性

以胆酸和亚磷酸酯为原料,在缩合剂二环己基碳二亚胺(DCC)和4-二甲基吡啶(DMAP)的催化下进行酯化反应,合成了10个未见报道的胆酸酰氧基膦酸酯衍生物,所有目标化合物均经过TG,IR,1 H NMR,31P NMR和HRMS对其进行了结构确认.利用MTT法测定了目标化合物的抗肿瘤活性,结果显示:目标化合物4H,4I,4J对人肝癌细胞(HepG2)表现出较好的增殖抑制作用.     

含多氟烷基吡唑环的邻甲酰氨基苯甲酰胺类化合物的合成及杀虫活性

以2,3-二氯吡啶和水合肼为起始原料,经取代、缩合、氧化、醚化、成环和开环等多步反应合成一系列结构新颖的含多氟烷基吡唑环的邻甲酰氨基苯甲酰胺类化合物,结构经1H NMR和HRMS确证,并测试了目标化合物的杀虫活性.杀虫活性结果表明,在浓度0.8 mg/L下,大部分化合物对粘虫(Mythimna separata Walker)具有100%杀虫活性;在浓度2 mg/L下,N-(4-氯-2-(异丙基氨基甲酰)-6-甲基苯基)-1-(3-氯吡啶-2-基)-3-((1-甲基-3-五氟乙基-4-三氟甲基-1H-吡唑-5-基)氧基)-1H-吡唑-5-酰胺(8c)和N-(4-氯-2-(环丙基氨基甲酰)-6-甲基苯基)-1-(3-氯吡啶-2-基)-3-((1-甲基-3-五氟乙基-4-三氟甲基-1H-吡唑-5-基)氧基)-1H-吡唑-5-酰胺(8d)对斜纹夜蛾(Prodenia litura Fabricius)杀虫活性大于60%;在浓度0.08 mg/L下,N-(4-氯-2-(二甲基氨基甲酰)-6-甲基苯基)-1-(3-氯吡啶-2-基)-3-((1-甲基-3-五氟乙基-4-三氟甲基-1H-吡唑-5-基)氧基)-1H-吡唑-5-酰胺(8l)对小菜蛾(Plutella xylostella Linnaeus)杀虫活性达到82.5%.     

N-[4-氯-2-取代氨基甲酰基-6-甲基苯基]-1-芳基-5-氯-3-三氟甲基-1H-吡唑-4-甲酰胺的合成及生物活性

通过改变传统氯虫酰胺中吡唑环上氨基甲酰基与吡啶环之间的相对位置, 或以其它芳环取代原分子中的吡啶环, 设计合成了24个结构新颖的N-[4-氯-2-取代氨基甲酰基-6-甲基苯基]-1-芳基-5-氯-3-三氟甲基-1H-吡唑-4-甲酰胺类化合物. 所有目标化合物的结构均通过¹H NMR谱、 元素分析或高分辨质谱表征确定. 初步的生物活性测试结果表明, 部分化合物对东方粘虫具有较好的杀虫活性, 其中化合物6m在浓度为50 mg/L时具有80%的杀虫活性. 同时, 在浓度为50 mg/L时目标化合物对5种常见病菌具有明显的抑制作用, 其中化合物6n和6x对苹果轮纹菌的抑菌率达62.1%.     

2－甲基－3－芳基－7－（5，5－二甲基－3－酮－1－环己烯－1－基）甲酸酯－4（3H）－喹唑啉酮的合成

以2－氨基对苯二甲酸（1）为起始原料，与乙酸酐缩合生成7－羧基乙酰苯邻 甲内酰胺（2）；2和芳胺缩合产生7－羧基－2－甲基－3－芳基－4（3H）－喹唑啉 酮（3）；3和N，N－双环己基碳双亚胺（DCC）加成得到中间体4，4在4－二甲氨基 吡啶（DMAP）催化下和5，5－二甲基－1，3－环己二酮（5）缩合得到目标产物2－ 甲基－3－芳基－7－（5，5－二甲基－3－酮－1－环己烯－1－基）甲酸酯－4（ 3H）－喹唑啉酮（6）。所得15个新型化合物的结构均经^1H NMR、元素分析确证， 部分化合物经IC／MSD确证。     

新型N-(5-烷基-1,3,4-噻二唑-2-基)-11[(杂芳基)甲基]-5-甲基-1H-1,2,3-三唑基-4-甲酰胺的合成与生物活性

为了寻找新型高效低毒的农药先导化合物,采用1-[(杂芳基)甲基]-5-甲基-1H-1,2,3-三唑基-4-甲酰氯与2-氨基-5-烷基-1,3,4-噻二唑的缩合反应,合成了8种未见文献报道的目标化合物,其结构经IR,1H NMR和元素分析确证,部分化合物还经MS的进一步证实.初步的生物活性测试结果表明,部分目标化合物在100 mg/L浓度下对双子叶植物(油菜)显示出中等的除草活性和一定程度的杀虫活性(250 mg/L).     

新型一枝蒿酮酸异噁唑衍生物的合成及其抗A,B型流感病毒活性研究

为了提高一枝蒿酮酸的生物活性,以一枝蒿酮酸和3-取代苯基-5-氨甲基-异噁唑为原料,在偶合试剂DCC,HOBt/DMAP的作用下,合成了6个未见文献报道的含异噁唑的一枝蒿酮酸酰胺衍生物3a～3f.所合成的化合物均经过IR,1H NMR,13C NMR,ESI-MS等分析方法表征及初步体外抗A(H3N2,H1N1)型和B型流感病毒活性研究.初步实验结果表明:化合物3c同时具有抗A(H3N2)型和B型流感病毒活性,化合物3c和3e表现出比母体化合物强的抗B型流感病毒活性.     

Facile Synthesis of Novel Amino Acids Derivatives as Potential Antibacterial Agents using Sustainable Materials

Following the principles of green chemistry, cardanol derivatives have been used as renewable, low‐cost, and available natural starting materials to construct a variety of protected and unprotected amino acids derivatives. The reaction of cardanol derivatives with different phthaloylamino acids including glycine, alanine, phenylalanine, and valine in the presence N,N'‐ dicyclohexylcarbodiimide (DCC ) as coupling reagent afforded high yields of the target compounds. Deprotection of phthaloylamino acids derivatives was achieved by heating with hydrazine hydrate. The chemical structures of all products were confirmed by spectral data (IR , MS , ¹H NMR , ¹³C NMR ) and elemental analyses. Antibacterial evaluation of the synthesized products was performed, which exhibited potent to weak activity in comparison with a standard drug.     

4-N,N-Dimethylaminopyridine promoted selective oxidation of methyl aromatics with molecular oxygen

4-N,N-Dimethylaminopyridine (DMAP) as catalyst in combination with benzyl bromide was developed for the selective oxidation of methyl aromatics. DMAP exhibited higher catalytic activity than other pyridine analogues, such as 4-carboxypyridine, 4-cyanopyridine and pyridine. The sp3 hybrid carbon-hydrogen (C-H) bonds of different methyl aromatics were successfully oxygenated with molecular oxygen. The real catalyst is due to the formation of a pyridine onium salt from the bromide and DMAP. The onium salt was well characterized by NMR and the reaction mechanism was discussed.     

甘草次酸3位氨基酸衍生物的合成及其抑菌活性

以甘草次酸(1)为原料,将其11位羰基还原、30位羧基酯化得11-脱氧甘草次酸-30-乙酯(3)。再以四氢呋喃为溶剂,N,N’-二环己基碳二亚胺(DCC)/4-二甲基氨基吡啶(DMAP)为偶合剂,选用Fmoc保护氨基酸对11-脱氧甘草次酸-30-乙酯的3位羟基进行酯化,得到11-脱氧甘草次酸-30-乙酯-3位氨基酸酯衍生物(4a～4d)。化合物4a～4d在V(CHCl2)∶V(Et2NH)=1∶1溶液中脱去Fmoc保护基得到最终产物(5a～5d),产率80%～87%。化合物5a～5d用1H NMR、EI-MS进行了表征。活性实验结果表明,化合物5a～5d对在高浓度二甲基甲酰胺下生长的枯草芽孢杆菌、大肠杆菌和酵母菌具有保护作用。     

聚丙交酯/聚乙二醇多嵌段共聚物的合成及其性能

聚丙交酯 (ＰＬＬＡ)由于具有良好的生物降解性和生物相容性 ,在医学领域已经得到了广泛的临床应用 ,近来又被制备成细胞支架大量应用于组织工程中[1,2 ] ,但由于其疏水性而造成细胞亲和性不好 .聚乙二醇 (ＰＥＧ)具有良好的亲水性 ,良好的生物相容性 ,但是ＰＥＧ是非降解性的 ,只有低分子量的ＰＥＧ可以被吞噬细胞所吞噬或透过肾滤膜而排出体外 ,因此 ,低分子量的ＰＥＧ常被用来与丙交酯 (Ｌ ＬＡ)共聚以改善ＰＬＬＡ支架的亲水性 .聚丙交酯 聚乙二醇共聚物 (ＰＬＥ)的三嵌段及两嵌段共聚物的合成及其性能的研究已被广泛报道[3～ 5] .研究…     

Reversible inhibition/activation of olefin metathesis: a kinetic investigation of ROMP and RCM reactions with Grubbs' catalyst

The metathesis activity of Grubbs' catalyst 1 was investigated in the presence of N-donor ligands (1-methylimidazole [MIM], 4-(N,N-dimethylamino)pyridine [DMAP], pyridine, and 1-octylimidazole [OIM]). Ring opening metathesis polymerization (ROMP) reactions of cyclooctene (COE), bulk-ROMP reactions of COE and norbornadiene (NBD), and ring closing metathesis (RCM) reactions of diethyl diallylmalonate (DEDAM) were conducted containing various equivalents of N-donor with respect to catalyst. ROMP reactions could be stopped using MIM (1-5 equiv) and DMAP (2-5 equiv), and slowed with pyridine (1-5 equiv) by factors >100, in benzene solution for 24 h. The stopped reactions could be initiated with excess phosphoric acid (H3PO4), and the reactions proceeded faster than with uninhibited Grubbs' catalyst in the first 4 min after reactivation. Thereafter, the reaction proceeded at the same rate as the reaction with the uninhibited catalyst. ROMP reactions in neat COE and NBD could be inhibited for 72 h using 2 equiv of MIM, DMAP, or OIM and activated with H3PO4 to give polymer gels within minutes or less. RCM reactions could be completely inhibited with MIM (1-5 equiv), but upon treatment with H3PO4, the reaction would proceed at a fraction of the initial rate accomplished by uninhibited Grubbs' catalyst 1. A structural investigation of the inhibited species showed that MIM and DMAP completely or partially transform catalyst 1 into the hexacoordinate species 5a or 5b producing free PCy3, which additionally acts as an inhibitor for the ROMP reaction. Upon reactivation, the PCy3 is protonated along the N-donor ligand; however, over the period of 5 min, the phosphine has been found to coordinate back to the ruthenium catalyst. Therefore, the reaction slows to the same polymerization rate as the reaction using the uninhibited catalyst at this point. Complexes 5a and 5b were isolated, characterized, and employed in ROMP and RCM experiments where they exhibited very low catalytic activity.     

5-阿维菌素B1a酯的合成及生物活性

阿维菌素B_1a(AVB_1a)与羧酸在DMAP/DCC体系中直接酯化,得到10个5-AVB_1a酯衍生物,产率50%～79%;其化学结构由IR,¹H NMR,¹³CNMR和MS谱确证.生物活性测定结果表明,部分5-阿维菌素B_1a酯衍生物具有良好的杀虫、杀螨活性.     

Synthesis of and tautomerism in 3-acyltetramic acids

The synthesis of 3-acyltetramic acids, the substructure of bioactive natural products, via O-acylation of tetramic acids with carboxylic acids followed by acyl migration, has been investigated. This acylation sequence is mediated by N,N'-dicyclohexylcarbodiimide (DCC) and 4-dimethylaminopyridine (DMAP) and is very sensitive to the nature of the nitrogen substituent (R(1)), the nature of the carboxylic acid (R(2)CO(2)H), and the amount of DMAP. Acylation of N-acyl tetramic acids with an alkyl carboxylic acid using 1.3 equiv of DMAP (with 1.1 equiv of DCC) unexpectedly gave the 3-acyltetramic acid directly as a result of acyl migration induced by excess amounts of DMAP. On the other hand, N-unsubstituted, N-alkyl, and N-acyl tetramic acids with alkyl and aromatic carboxylic acids gave the O-acyl tetramic acids by using only 0.1 equiv of DMAP (with 1.1 equiv of DCC); these could be further rearranged to the acyl product by treatment with excess DMAP. The tautomeric equilibrium of these 3-acyltetramic acids in solution was found to strongly depend on the nitrogen substituent group (R(1)) rather than the 3-acyl group.     

高效高分子酰化催化剂——含超亲核试剂聚酰胺的合成与表征

以４ 氨基吡啶为原料,制备各种含烷氨基吡啶基团的二元酰氯和二元胺反应性单体,再经缩聚反应得到聚酰胺型高分子超亲核催化剂．用气相色谱跟踪以聚酰胺催化的叔丁醇反应,结果表明,聚酰胺在酰化反应体系中有着良好的溶解性,含烷氨基吡啶基团的线型聚酰胺具有比４ （ Ｎ,Ｎ 二甲基氨基） 吡啶（ＤＭＡＰ） 更高的催化能力,而交联型树脂较其线型聚合物活性有所降低．     

超声波辐射下异阿魏酸对氯苯酚酯的一步合成

室温超声辐射下,4-二甲氨基吡啶(DMAP)作催化剂,二环己基碳二亚胺(DCC)作脱水剂,不需保护异阿魏酸分子中的羟基,异阿魏酸和对氯苯酚的一步反应直接合成了异阿魏酸对氯苯酚酯。在n(异阿魏酸):n(对氯苯酚):n(DCC):n(DMAP)=1:1.2:1.2:0.1混合时,室温超声反应2.5h,得产率76.2%。目标化合物的结构经元素分析、1HNMR和IR测试技术得到确证。缩短了反应时间,提高了产率。