2-氨基-4H-咪唑啉-4-酮衍生物的快速平行合成法

咪唑啉酮衍生物是一类具有良好生物活性和药理活性的杂环化合物 [1,2 ] ,尤其是一些 2 -氨基咪唑啉酮表现出良好的杀菌、抗炎及抗癌活性 [3 ,4 ] .从自然界如一些海洋生物中可分离得到含 2 -氨基咪唑啉酮结构的生物碱 [5,6] .最近 ,组合化学方法广泛地应用于有机合成 ,它包括固相合成法和液相合成法[7～ 9] .我们曾应用氮杂 Wittig反应制得 2 -氨基取代咪唑啉酮衍生物 ,部分化合物表现出一定的抑菌活性 [10 ,11] .本文进一步报道应用液相平行反应法快速合成 2 -氨基 - 4H-咪唑啉 - 4-酮衍生物 (4) .该方法应用烯基膦亚胺 1与苯基异氰酸酯的…     

7,8-亚甲二氧基-4-氧代-3,4-二氢嘧啶并[4,5-b]喹啉衍生物的合成

为了寻找具有药理活性的喹啉衍生物, 我们合成了五个新的喹啉衍生物和十一个7,8--亚甲二氧基-4-氧代-3,4-二氢嘧啶并[4,5-b]喹啉衍生物. 这些化合物的结构均经核磁共振光谱, 红外光谱和元素分析予以证实 .     

邻氨基苯硫基-1-丙酮缩合反应动力学及机理

1，5-苯并硫氮杂（Ⅱ）是一类重要的七元杂环化合物，具有明显的生理活性．多年来，其合成、结构及药理活性的研究一直受到广泛关注[1-5]．（Ⅱ）通常由1，3-二烃基-3-邻氨基苯硫基-1-丙酮（简称氨基酮）分子内缩合反应合成．本文用紫外分光光度法结合核磁共振监测反应中间过程     

多取代-5-氨基-3,7-二苯基-7H-噻唑并[3,2-a]嘧啶-6-腈衍生物的合成及生物活性

以朝格尔碱衍生物(5,12-二甲基-3,10-二苯基-双-1H-吡唑[b,f][4,5]-1,5-二氮杂双环[3.3.1]-2,6-辛二烯,1)为催化剂,以取代的α-溴代苯乙酮、芳香醛、丙二腈和硫脲为原料四组分一锅法合成了一系列噻唑并[3,2-a]嘧啶衍生物.通过1H NMR和化学实验探讨了该反应的机理.体外药理活性实验结果表明,多个产物对人肝癌细胞(Hep G2)、人非小细胞肺癌细胞(247)和人非小细胞肺癌细胞(A549)中的一个或多个细胞株具有较高抑制活性,七个产物对耐甲氧西林金黄色葡萄球菌具有抑菌活性.这些结果表明该类化合物在新药开发中具有巨大潜力.     

6-(4-取代苯基)-5-甲基-4,5二氢-3(2H)哒嗪酮化合物的合成及其抑制血小板聚集作用

血小板聚集在血栓形成中起着先导而关键的作用,而严重威胁人类生命健康的心脑血管疾病多数与血栓形成和血栓栓塞有着密切的联系[1]。二氢哒嗪酮类化合物对抑制血小板聚集有较强的药理活性,对二磷酸腺苷(ADP)、花生四烯酸(AA)、血小板活化因子(PAF)和胶原(Collagen)引起的血小板聚集均有抑制作用。深入研究二氢哒嗪酮类化合物的构效关系,以期寻找活性更强的抗血小板聚集药物,是开发新型心脑血管系统疾病药物的重要研究方向之一。本文设计合成了6-(4-取代苯基)-5-甲基-4,5二氢-3(2H)哒嗪酮类化合物[2,3,4],并进行了体外药理实验。1实验部…     

4-甲基-苯磺酸-2-氧-2-[3-(5-芳基-[1,3,4]噁二唑-2-基)-硫脲]-乙基酯的合成及生物活性研究

合成了12个未见文献报道的4-甲基-苯磺酸2-氧-2-[3-(5-芳基-[1,3,4]噁二唑-2-基)-硫脲]-乙基酯, 其结构经元素分析、¹H NMR和IR确证. 初步活性测试结果表明: 部分化合物有较好的杀菌活性.     

2,3a-二氢-苯并吡喃[4,3-c]吡唑-3-酮类衍生物的合成及其活性

为了进一步寻找新型黄酮类农药,以苯并吡喃[4,3-c]并吡唑-3-酮为先导结构,以4-氯苯甲醚为起始原料.设计合成了33种新型的2,3a-二苯并吡喃[4,3.c]吡唑-3-酮类化合物,其结构经MS,~1H NMR和元素分析确证.并对化合物7k的单晶进行了结构测定,对目标化合物进行了杀虫和杀菌活性测试.结果表明,大部分化合物显示出一定的杀菌活性和弱的杀虫活性.     

3-[2,6-二氯-4-(3,3-二氯烯丙氧基)苯氧基]丙基吡唑-5-羧酸酯类衍生物的合成及杀虫活性

以3-[2,6-二氯-4-(3,3-二氯烯丙氧基)苯氧基]丙醇和5-吡唑甲酸衍生物为原料,设计并合成了14个未见报道的3-[2,6-二氯-4-(3,3-二氯烯丙氧基)苯氧基]丙基吡唑-5-羧酸酯类衍生物.目标化合物的结构经IR,1HNMR和元素分析测定确认.初步杀虫活性测试结果表明,该类化合物对鳞翅目害虫具有较好的杀虫活性.     

新型4-(5-N-取代-1,3,4-噻二唑-2-巯基)-苯并[4,5]呋喃[3,2-d]嘧啶类衍生物的合成及其抗癌活性

将5-取代胺基-2-巯基-1,3,4-噻二唑引入苯并[4,5]呋喃[3,2-d]嘧啶中,设计并合成了10个新型的4-(5-N-取代-1,3,4-噻二唑-2-巯基)-苯并[4,5]呋喃[3,2-d]嘧啶类衍生物(3a～3j),其结构经1H NMR,13C NMR,IR和MS确认。用MTT法测定了3a～3j对人胃腺癌细胞体(MGC)的体外增殖活性。结果表明,3a～3j均具有不同程度的抑制MGC的活性,其中4-(5-N-2’-甲氧基苯基-1,3,4-噻二唑-2-巯基)-苯并[4,5]呋喃[3,2-d]嘧啶(3j)在10μmol·L-1的浓度下对MGC的抑制率为86.4%。     

S-烃基-1-烃基-3-[4-(苯并咪唑-2-巯基)苯基]异硫脲的合成及其iNOS抑制活性

以2-巯基苯并咪唑(1)为原料,经缩合和还原得到2-(4-氨基苯硫基)苯并咪唑(3),再与异硫氰酸苯甲酰酯或异硫氰酸烃基酯反应得到取代硫脲(5和7),最后与卤代烃反应得到20个新的S-烃基-1-烃基-3-[4-(苯并咪唑-2-巯基)苯基]异硫脲化合物(6和8),其结构经IR,¹HNMR,MS及元素分析确证.初步的药理试验表明,20个目标化合物均有不同程度的iNOS抑制活性,其中化合物6b,8d和8f的iNOS抑制活性与阳性对照药氨基胍相当.     

A Convenient Synthesis of N-Substituted 1,6-Dihydro-3(2H)-Pyridinones

N-Substituted 1,6-dihydro-3(2H)-pyridinones have been synthesised from N-substituted piperidine-3,5-diones via the methyl enol ethers. Reduction of the latter with sodium borohydride (NaBH₄) is described.     

Catalytic hydroformamination of 2,5-dimethoxy-2,5-dihydrofurans

N-Substituted 3- and 4-formylpyrroles have been obtained by hydroformamination of 2,5-dimethoxy-2,5-dihydrofurans in the presence of HRh(CO)(PPh₃)₃.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 8, pp. 1837–1840, August, 1990.     

Synthesis and structure of N-substituted 2-amino-3-phenacylidene-3,4-dihydroquinoxalines

N-Substituted 2-imino-5-aryl-2,3-dihydro-3-furanones react with o-phenylenediamine to form N-substituted 2-amino-3-phenacylidene-3,4-dihydroquinoxalines.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, pp. 528–531, April, 1989.     

Nad(p)+-nad(p)H model. Reduction of pyridinium salts to 1,4-dihydropyridines using glyceraldehyde

N-Substituted 3-carbamoylpyridinium salts were reduced by glyceraldehyde to give 1,4-dihydronicotinamide derivatives, which may be regarded as a model for oxidation by glyceraldehyde-3-phosphate dehydrogenase.     

Acyl and aroyl derivatives of 4-amino-1,2,5-trimethylpiperidine

N-Substituted amides of some aliphatic and aromatic acids, respectively, have been obtained by the acylation and aroylation of 4-amino-1,2,5-trimethylpiperidine.     

N-Substituted 3-methoxycarbonyl-4-phenyl-2-pyrrolidones in reactions with nitroethenes

N-Substituted 3-methoxycarbonyl-4-phenyl-2-pyrrolidones react with 2-aryl(heteryl)-1-nitroethenes as typical CH-acids to give nucleophilic addition products. The structure of compounds obtained was studied by IR, ¹H and ¹³C NMR spectroscopy using HOESY experiment.     

4H-dithieno[2,3-b:3',2'-e][1,4]thiazines--synthesis and electronic properties of a novel class of electron rich redox systems

Quantum chemical screening reveals that 4H-dithieno[2,3-b:3',2'-e][1,4]thiazines possess the highest HOMO among four constitutional isomers, even 0.27 eV higher in energy than the well established 10H-phenothiazine. N-Substituted 4H-dithieno[2,3-b:3',2'-e][1,4]thiazines are readily accessible by twofold Pd-catalyzed amination. According to cyclic voltammetry dithienothiazines are reversibly oxidized and can be considered as new donors for functional π-systems.     

A study on one-electron oxidation of phenothiazine derivatives BV piperidine oxoammonium ion in SDS micelle

N-Substituted phenothiazines were oxidized by 2,2,6,6-tetramethy-4-acetyloxypiperidine oxoammonium hexachloroantimonate (TAPO) to the corresponding radical cations in sodium dodecyl sulfate (SDS) micellar solution. The radical cations of phenothiazine derivatives were generated and stabilized by the anionic micelle in queous solution. An electron transfer mechanism has been proposed.     

Synthesis and cyclization of N-(2-hydroxyphenyl)-and N-(2-benzyloxyphenyl)-Β-alanines

N-Substituted -alanines have been synthesized by treating o-aminophenol or o-benzyloxyaniline with acrylic, methacrylic, or crotonic acids. Their cyclization to 2-benzoxazolinones and dihydro-2,4(1H,3H)-pyrimidinediones has been studied.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, pp. 527–531, April, 1991.     

Synthesis of diverse phenylglycine derivatives via transformation of Ugi four-component condensation primary adducts

3-(N-Substituted)amino-4-arylamino-1H-isochromenones (isocoumarins) which can be regarded as the enediamine tautomers of the Ugi four-component condensation primary adducts between 2-formylbenzoic acids, arylamines, and isocyanides undergo a facile ring cleavage with amines to give a series of phenylglycine derivatives. Thus, a synthetically useful post-condensation transformation of Ugi four-component condensation primary adducts is described for the first time.