新型4-芳基-5,6,7,8-四氢喹唑啉-2-胺类化合物的合成及其生物活性研究

以α-蒎烯为原料,经加成-氧化后与多种芳香醛缩合制得中间体4-芳亚甲基异松蒎酮3a~3h,3a~3h与盐酸胍在叔丁醇钾催化作用下合成8种新型4-芳取代-5,6,7,8,-四氢喹唑啉-2-胺类化合物4a~4h.其结构经IR,1H NMR,13C NMR,GC-MS和元素分析表征.初步探讨了所合成化合物对人乳腺癌细胞MCF-7和人肺癌细胞A549的体外生物活性,结果显示部分化合物具有很好的抗肿瘤活性.     

含苯并咪唑的2,4-取代喹唑啉衍生物的合成及抗肿瘤活性评价（英文）

为了寻找高效的抗肿瘤药物,设计并合成了一系列新型的2,4-取代喹唑啉类衍生物,采用噻唑蓝(MTT)法对目标化合物在人类胃癌细胞(MGC-803)、乳腺癌细胞(MCF-7)和人正常胃黏膜上皮细胞GES-1进行抗肿瘤活性评价,结果显示部分化合物对MGC-803和MCF-7表现出中度至强效的抗肿瘤活性.喹唑啉的4位被不同芳胺取代时,2-(((1H-苯并[d]咪唑-2-基)甲基)硫基)-N-(4-甲氧基苯基)喹唑啉-4-胺(15e)对MGC-803具有较好的抗肿瘤活性,IC50值为4.60μmol·L-1;喹唑啉的4位被不同查尔酮取代时,(E)-1-(4-((2-(((1H-苯并[d]咪唑-2-基)甲基)硫基)喹唑啉-4-基)氨基)苯基)-3-(3-硝基苯基)丙-2-烯-1-酮(15k)对MGC-803具有很强的抗肿瘤活性, IC50值为0.97μmol·L-1,明显优于化合物15e.但是化合物15e对GES-1的毒性远远大于化合物15k,化合物15k的毒性与对照药品5-氟尿嘧啶和吉非替尼相近.分子对接结果显示,化合物15k与表皮生长因子受体(EGFR)的结合模式优于15e,为研究新型的EGFR抑制剂提供了新的思路.     

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-取代的6-溴甲基-4(3H)-喹唑啉酮的合成

2-取代的6-溴甲基-4(3H)-喹唑啉酮的合成;4(3H)-喹唑啉酮;苯并噁嗪酮;N-溴代琥珀酰亚胺; 合成     

2-取代苯氨基喹唑啉衍生物的合成及抗肿瘤活性研究

以2,4-喹唑啉二酮为起始原料,通过氯代、Suzuki偶联和芳环亲核取代反应得到一系列2-取代苯氨基喹唑啉衍生物,并经~1H NMR,~(13)C NMR和HRMS进行结构确证.应用溴化噻唑蓝四氮唑(MTT)法对目标化合物进行了初步体外抗肿瘤细胞增殖活性研究.结果表明,部分化合物具有较好的体外抗肿瘤细胞增殖活性,其中活性化合物4u和4v对Hela,A549和MCF-7三种肿瘤细胞株的增殖均有明显抑制作用.     

新型香豆素类衍生物的合成及抗肿瘤活性研究

为了寻找结构新颖、活性较好的抗肿瘤化合物,设计合成了19个未见文献报道的3,4,5-三甲氧基苯基香豆素类化合物,并用核磁共振(NMR)和高分辨质谱(HRMS)等方法对化合物结构进行表征.用四甲基偶氮唑盐(MTT)法评价了该类化合物对人前列腺癌细胞(PC-3)、人食管癌细胞(EC-109)和人胃癌细胞(MGC-803)三种肿瘤细胞的抑制活性.结果显示,N-苄基-2-((4-甲基-2H-色烯-2-酮-7-基)氧基)-N-(3,4,5-三甲氧基苯基)乙酰胺(4a)和N-((5-氯苯并[b]噻吩-3-基)甲基)-2-((4-甲基-2H-色烯-2-酮-7-基)氧基)-N-(3,4,5-三甲氧基苯基)乙酰胺(4n)对三种肿瘤细胞的抑制活性优于阳性对照药5-氟尿嘧啶,其中化合物4n对人前列腺癌细胞(PC-3)的抑制活性最好,其IC_(50)为4.18μmol/L.     

6-取代-3-（3，4，5-三甲氧基苯基）-1，2，4-三唑[3,4-b][1,3,4]噻二唑的合成与生物活性

以3,4,5-三甲氧基苯甲酸为原料,通过4步反应得到4-氨基-5-(3,4,5-三甲氧基苯基)-3-巯基-1,2,4-三唑,再与取代芳酸反应,得到11个6-取代-3-(3,4,5-三甲氧基苯基)-1,2,4-三唑[3,4-b][1,3,4]噻二唑衍生物5a～5k。其结构经IR,1H NMR,MS和元素分析确证。初步生物活性测试结果表明部分化合物有一定的杀菌活性。     

2-甲硫基-4-芳胺喹唑啉衍生物的合成及抗肿瘤活性评价

为了寻求高效的新型抗肿瘤药物,设计并合成了一系列新型2-甲硫基-4-苯胺喹唑啉衍生物,对这些化合物在人类四种癌细胞MGC-803(人胃癌细胞)、PC-3(人前列腺癌细胞)、HGC-27(人胃癌细胞)和A549(人非小细胞肺癌细胞)进行抗肿瘤活性评价.结果显示部分化合物具有较好的抗肿瘤活性,其中N-(4-氟苯基)-2-(甲硫基)喹唑啉-4-胺(9c)和N-(4-甲基苯基)-2-(甲硫基)喹唑啉-4-胺(9m)显示出较高的抗肿瘤活性, IC_(50)值分别为0.18和0.68μmol·L~(-1).     

2,3-二取代喹唑啉-4(3H)-酮化合物的合成及生物活性研究

设计合成了一系列2,3-二取代喹唑啉-4(3H)-酮化合物,并研究了常用无机干燥剂对目标化合物合成的影响,发现无水硫酸镁能够促进2,3-二取代喹唑啉-4(3H)-酮化合物的形成.所有化合物通过核磁共振氢谱、核磁共振碳谱、高分辨质谱等方法进行结构表征,并首次报道了6-氯-3-苄氨基-2-新戊基-8-甲基喹唑啉-4(3H)-酮的单晶结构.通过生物活性测试发现部分化合物在200 mg/L浓度下对小麦白粉病(Blumeria graminis)具有较好的活体防效.     

水相中可见光下苯甲醇氧化合成喹唑啉酮衍生物的研究

通过在水相中可见光下2-氨基苯甲酰胺与苄醇氧化制备喹唑啉酮的环化反应,应用廉价易得、操作简单的单质碘作为光催化剂,在室温下反应获得较好收率的产物.目标产物的最高产率可达92%,为喹唑啉酮类化合物的合成提供了一种绿色经济的方法.运用此策略合成的N-(2-氟-5-甲基苯基)-6-(2,2,2-三氟乙氧基)蝶啶-4-胺对肿瘤细胞具有明显的抑制活性.     

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%.     

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.     

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.     

Selective syntheses of 2H-1,3-oxazines and 1H-pyrrol-3(2H)-ones via temperature-dependent Rh(II)-carbenoid-mediated 2H-azirine-ring expansion

The Rh(II)-catalyzed reaction of 2-carbonyl-substituted 2H-azirines with ethyl 2-cyano-2-diazoacetate or 2-diazo-3,3,3-trifluoropropionate provides an easy access to 2H-1,3-oxazines and 1H-pyrrol-3(2H)-ones. These compounds can be selectively prepared from the same starting material using temperature as the only varied parameter. The 2-azabuta-1,3-diene intermediate, a common precursor for both heterocyclic products, isomerizes into 2H-1,3-oxazine under kinetic control, while 1H-pyrrol-3(2H)-one is the sole product of the reaction at elevated temperatures. According to DFT-calculations a one-atom oxazine ring contraction involving ring-opening to a 2-azabuta-1,3-diene intermediate, followed by a 1,5- and 1,2-prototropic shift leads to the consecutive formation of imidoylketene and azomethine ylide, which then further undergo cyclization to the pyrrole derivative.     

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.