4-芳氨基-6,7-二甲氧基喹唑啉的合成及生物活性研究

以4-氯-6,7-二甲氧基喹唑啉和4-(2-芳基)乙烯基苯胺或4-[2-(2-呋喃基)]乙烯基苯胺为原料合成了5种4-芳氨基-6,7-二甲氧基喹唑啉类化合物.利用IR、NMR和元素分析等表征手段对其进行了结构确认.这5种化合物对HT-29和MDA-MB-231两种细胞模型的体外抗癌活性测试结果表明,部分化合物具有良好的...     

3-氨基-7,8-二甲氧基香豆素及其衍生物的合成及抗氧化活性

合成了3-氨基-7,8-二甲氧基香豆素及其衍生物共11个化合物,其中3个化合物(2b、2d、2e)为新型香豆素芳酰胺类化合物。 通过猝灭1,1-二苯基-2-三硝基苯肼(DPPH)、2,2'-联氮二(3-乙基苯并噻唑-6-磺酸)二铵盐阳离子自由基(ABTS^+·)和羟自由基实验考察了所合成化合物的抗氧化活性,结果表明化合物2b对DPPH自由基、羟自由基的清除能力超出或接近对照品维生素C,而衍生物2a、2b和2c的抗氧化活性优于母体。 故酰化可提高3-氨基-7,8-二甲氧基香豆素的抗氧化性能,尤其是普遍提高了羟基自由基的清除能力。     

6,7-二甲氧基喹啉衍生物的合成及体外抗肿瘤活性研究

以3,4-二甲氧基苯胺和丙二酸为原料,经过多步反应合成得到一系列6,7-二甲氧基喹啉衍生物(3～7b),中间体及产物结构经~1H NMR和ESI-MS表征。并着重考察了Suzuki反应中,物料比对化合物5a和5b收率的影响,确定适宜物料比为n(化合物4)∶n(乙烯基硼酸频哪醇酯)=1∶2.0。在该反应条件下,化合物5a和5b收率分别为54.5%和33.8%。采用MTT法测定6,7-二甲氧基喹啉衍生物3～7b对人肝癌细胞HepG2及人非小细胞肺癌A549的体外抗肿瘤活性。结果表明,化合物7b对HepG2细胞的体外生长具有显著的抑制活性,IC_(50)为8.9±0.95μM·L~(-1)。     

3-取代-12-氧代-N,N-双(2-氯乙基)脱氧胆酰胺的合成及其抑制癌细胞活性

以7-脱氧胆酸(1)为原料,由Jones试剂氧化得到3,12-二氧代-7-脱氧胆酸(2),然后与双(2-氯乙基)胺反应,得到3,12-二氧代-N,N-双(2-氯乙基)-7-脱氧胆酰胺(4),进一步通过对化合物4中的3-位羰基进行官能团转换,得到2个3-位分别被肟基、缩胺硫腙基取代的12-氧代-N,N-双(2-氯乙基)-7-脱氧胆酰胺类型化合物。同时,初步测试了合成物对肿瘤细胞增殖抑制活性,结果表明,化合物对宫颈癌细胞的生长有显著的抑制活性。     

1,7-双(N-取代氨基甲基)-2,8-二羟基-朝格尔碱的合成及其催化的Aldol-Ullmann反应（英文）

合成了新型1,7-双(N-取代氨基甲基)-2,8-二羟基-朝格尔碱(4),以4为催化剂催化了4-羟基香豆素和2-亚苄基丙二腈[或甲基(乙基)-2-氰基-3-苯基丙烯酸]的Aldol反应,获得了一系列化合物8;以4为配体与钯联合催化了串联Aldol-Ullmann反应,得到了化合物10和12.测试了所有化合物对人三阳性乳腺癌细胞(MCF-7)、人三阴性乳腺癌细胞(MDA-MB-231)、人肝癌细胞(HepG2)和人肝癌细胞(MHCC-97H)的抗癌活性以及对人肝细胞(LO2)的细胞毒性.其中,1,7-双((甲基氨基)甲基)-6H,12H-5,11-甲二苯并[b,f][1,5]二氮芳辛-2,8-二醇(4b)对MCF-7(抑制率>30%)、1,7-双((((1-苯乙基)氨基)甲基)-6H,12H-5,11-甲二苯并[b,f][1,5]二氮芳辛-2,8-二醇(4d)和1,7-双(((吡啶-2-基甲基)氨基)甲基)-6H,12H-5,11-甲基二苯并[b,f][1,5]重氮-2,8-二醇(4e)对MDA-MB-231具有较高的选择性和抑制活性, 2-氨基-5-氧代-4-(3,4,5-三甲氧...     

新型N-[2-((取代苯基)氨基)吡啶-3-基]嘧啶甲酰胺的合成、杀菌活性及分子对接

为寻找新型结构的琥珀酸脱氢酶抑制剂,以高效杀菌剂啶酰菌胺为先导化合物,设计、合成了17种N-[2-((取代苯基)氨基)吡啶-3-基]-4-甲基-2-甲硫基嘧啶-5-甲酰胺(4a～4g)和N-[2-((取代苯基)氨基)吡啶-3-基]-4-甲氧基-2-甲硫基嘧啶-5-甲酰胺(4h～4q),并通过~1H NMR、~(13)C NMR和MALDI-TOF-MS确证了化合物的结构.离体杀菌活性试验表明,在剂量为50μg/mL时, 16种化合物对菌核菌表现出较高的杀菌活性,抑制率在90%以上.一些化合物在此剂量下对灰霉菌显示出中等活性,抑制率为70%～84%.分子对接研究揭示了具有较高活性的化合物,N-[2-((3-氟-4-甲基苯基)氨基)吡啶-3-基]-2-甲硫基-4-甲氧基嘧啶-5-甲酰胺(4p)与琥珀酸脱氢酶(SDH)靶酶氨基酸形成4个氢键和一个阳离子-π相互作用.     

微波辐射下"一锅煮"法合成9-芳基-1,8-二氧代-9H-二苯并[c,h]-2,7,10-三氧杂蒽

以芳醛、4-羟基香豆素为原料,乙醇为能量转移剂,在微波辐射下一步合成了一系列9-芳基-1,8-二氧代-9H-二苯并[c,h]-2,7,10-三氧杂蒽,反应在4～8min内完成,产率57%～97%.     

4(3H)-喹唑啉酮芳胺衍生物的合成及其抗肿瘤活性评价

根据非经典抗叶酸剂的结构特点,将抗肿瘤药效团三甲氧基苯基与4(3H)-喹唑啉酮结构相结合,设计了一系列具有芳胺侧链的4(3H)-喹唑啉酮衍生物。使用适量的卤代烷,在室温下对3．4,5-三甲氧基苯胺进行N-烷基化反应,制得了4种N-取代的3,4,5-三甲氧基苯胺,收率为30．3％～60．6％。将2-甲基-6-溴甲基-4(3H)-喹唑啉酮与3,4,5-三甲氧基苯胺、N-取代的3,4．5-三甲氧基苯胺以及其它芳胺在室温下反应,以30．8％～71．9％的收率合成了目标化合物8a～8m,其结构用ESI-MS、~1H NMR、元素分析或HRMS测试技术进行了表征。采用MTF法测试了化合物8a～8m对人非小细胞肺癌A-549、结肠癌HCT-8和肝癌Bel-7402细胞的体外抗肿瘤活性。结果表明,在5×10~(-6)g/mL质量浓度下所合成的化合物对3种肿瘤细胞的体外生长的抑制率均低于25％。     

水介质中1,6-二氧-5-氧代-1,4,5,6-四氢化菲衍生物的三组分一锅合成

水介质中在氯化三乙基苄基铵(TEBA)催化下, 芳醛与丙二腈和4-羟基香豆素三组分一锅反应合成了2-氨基-4-芳基-3-氰基-1,6-二氧-5-氧代-1,4,5,6-四氢化菲, 该反应具有产率高、污染少、操作简单、环境友好等优点.     

基于呋喃酚构建2-(4-芳氧苯氧基)丙酰胺及除草活性

以呋喃酚为原料, 采用2条合成路线制备2种关键中间体2-氨基-1-(2,2-二甲基-7-烷氧基-2,3-二氢苯并呋喃-5-基)乙酮盐酸盐(2)和n-(2,2-二甲基-2,3-苯并呋喃-7-氧基)烷胺(9), 再经2-(4-芳氧苯氧基)丙酰化合成了17种基于呋喃酚的2-(4-芳氧苯氧基)丙酰胺, 其化学结构经核磁共振谱、 高分辨率质谱和旋光度确证. 除草活性测试结果表明, 在1500 g/hm²剂量下, 大部分化合物对单子叶杂草马唐(Crabgrass)和稗草(Barnyard grass)均具有较高的抑制活性. 在化合物4和5中, 有7个化合物对单子叶杂草表现为A级除草活性, 如化合物4a, 4b, 4i, 5a, 5c, 5e和5h对马唐和稗草的抑制率为100%. 初筛结果显示, 在375 g/hm²剂量下, 化合物4a, 4b, 4i, 5e和5h对稗草的茎叶处理抑制率达96%以上.     

二氧化碳和丙烯直接合成甲基丙烯酸的NiPMo/TiO2催化剂的研究

用溶胶-凝胶法以磷钼酸(MPA)的镍盐溶液水解钛酸四丁酯制备了NiPMo/TiO2催化剂.使用ICP、 XRD、 TG-DTA、 IR、 TPD-MS和微反应技术研究了催化剂的化学组成、热稳定性、化学吸附性质和催化反应性能.杂多钼酸盐与TiO2通过O2-在TiO2表面发生了键合.在623 K下,杂多阴离子仍保持原有的Keggin结构.CO2在Lewis酸位Ni(Ⅱ)和Lewis碱位Ni-O-Mo的桥氧协同作用下生成CO2卧式吸附态Ni(Ⅱ)←O-(CO)←(O--Ni).丙烯有多种吸附态在催化剂上吸附.在563 K、 1 MPa和空速1500 h-1的反应条件下,丙烯的摩尔转化率为3.2%,产物MAA选择性为95%.     

Synthesis of 1-benzyloxypyrazin-2(1H)-one derivatives

Different approaches for the synthesis of 1-benzyloxypyrazin-2(1H)-one derivatives from simple amino acids have been investigated. A library of 33 precursors for the preparation of N-hydroxy pyrazinones was obtained in moderate to good yields.     

Toward new camptothecins. Part 6: Synthesis of crucial ketones and their use in Friedländer reaction

In the context of the preparation of camptothecin and luotonin A analogs, the synthesis of some key keto-precursors and their use in Friedländer condensation are described. This paper also focuses on the stability of these keto intermediates and emphasizes the major differences between indolizinones and pyrroloquinazolinones series. Noteworthy is also the report of some original structures isolated as by-products of some experiments.     

CoFe2O4自形成磁性液体场致结构化对磁化的影响

The Langevin paramagnetic theory can’t describe the relation between magnetization of ferrofluids and applied magnetic field. The structuralization of ferrofluids, which is considered the main influence factor of the magnetization, is regarded. The part of magnetization works is deposited when the structure is forming. This action influences the magnetization of ferrofluids directly or indirectly. On the base of the “compressing” model, the Langevin function that usually describes the magnetization of ferrofluid is modified, and a well-fitted curve is obtained. An equation of the relation between the equivalent volume fraction after being “compressed” and the intensity of magnetic field is discovered, which approximately describes the process of magnetization. The relation between the approximate initial susceptibility and the volume fraction can be obtained from modified formula.     

Highly regioselective Buchwald–Hartwig amination at C-2 of 2,4-dichloropyridine enabling a novel approach to 2,4-bisanilinopyridine (BAPyd) libraries

The highly regioselective Buchwald–Hartwig amination at C-2 of the cheap and readily accessible reagent, 2,4-dichloropyridine with a range of anilines and heterocyclic amines is described. This new methodology is robust and provides a facile access to 4-chloro-N-phenylpyridin-2-amines on 0.25 mol scale. These intermediates undergo a further Buchwald–Hartwig amination at higher temperature to enable rapid exploration of the chemical space at C-4 and to provide a library of 2,4-bisaminopyridines.     

KMnO4-mediated oxidative CN bond cleavage of tertiary amines: Synthesis of amides and sulfonamides

KMnO₄-mediated oxidative CN bond cleavage of tertiary amines producing secondary amine was introduced, which was trapped by electrophiles (acyl chloride and sulfonyl chloride) to form amides and sulfonamides. The reaction could take place at mild condition, tolerating a wide range of function groups and affording products in moderate to excellent yields.     

Chemistry of heterocyclic compounds at the A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, over 50 years (Review)

The review contains a concise historical account and information on the most significant researches undertaken by the staff at the A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences on the Chemistry of Heterocyclic Compounds. Dedicated to Academician of the Russian Academy of Sciences B. A. Trofimov on his 70th jubilee. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1443–1502, October, 2008.     

A general and convenient synthesis of 4-(tosylmethyl)semicarbazones and their use in amidoalkylation of hydrogen,heteroatom, and carbon nucleophiles

A general synthesis of previously unknown semicarbazone-based α-amidoalkylating reagents, 4-(tosylmethyl)semicarbazones, has been developed. The synthesis involved three-component condensation of semicarbazones of aliphatic or aromatic aldehydes with the same or other aldehydes and p-toluenesulfinic acid. The scope and limitations of this reaction were investigated. The compounds obtained were demonstrated to be an efficient α-(4-semicarbazono)alkylating agents. They were reacted with H- (sodium borohydride), O- (sodium methylate), S- (sodium phenylthiolate), N- (pyrrolidine, sodium succinimide), P- (trialkyl phosphites), and C-nucleophiles (sodium diethyl malonate) to give the corresponding products of the tosyl group substitution, 4-substituted semicarbazones, including analogues of nitrofurazone. Among the prepared compounds tested in vitro for antibacterial and antifungal activity, three nitrofuryl-containing semicarbazones exhibited high biological activities with minimum inhibitory concentration (MIC) values of 8–32 μg/mL.     

Sulfur-directed metal-free and regiospecific methyl C(sp3)–H imidation of thioanisoles

Regiospecific and direct imidation of the methyl C(sp³)–H bond of thioanisoles is realized under mild and metal-free conditions with N-fluorobis(benzenesulfonyl)imide as an oxidant and nitrogen source. Proposed mechanism suggests that thionium ion intermediates and a Pummerer-type reaction are involved. The imidation has advantages such as high step-economy, excellent functionality tolerance, and regiospecificity, giving structurally diverse imidation products.     

Synthesis of novel chiral bidentate hydroxyalkyl-N-heterocyclic carbene ligands and their application in palladium-catalyzed Mizoroki–Heck couplings and asymmetric addition of diethylzinc to benzaldehyde

A small library of new chiral bidentate hydroxyalkyl-imidazolium salts 1 is conveniently synthesized on multi-gram scale from inexpensive and commercially available chiral pool amino acids. The corresponding carbenes, generated by deprotonation of imidazolium salts 1, in combination with palladium(II) chloride were tested in the Mizoroki–Heck coupling reaction. The most significant results in terms of yields and reactivities were achieved with low catalyst loading. The catalytic activities of these imidazolium salts were also investigated in the asymmetric addition of diethylzinc to benzaldehyde. The use of MgO nanoparticles as an additive in conjunction with these ligands played a crucial role in increasing the efficiency of these reactions.