1,3-二(乙氧基甲基)-5-N,N-二甲氨基-6-甲基尿嘧啶的合成

报道了1,3-二(乙氧基甲基)-5-N,N-二甲氨基-6-甲基尿嘧啶方便、高产率的合成方法. 以6-甲基尿嘧啶(1)为起始物, 经硝化、嘧啶N¹,N ³-烷基化、还原及氨基甲基化, 首次高产率合成了1,3-二(乙氧基甲基)-5- N,N -二甲氨基-6-甲基尿嘧啶(5), 并对其化学结构进行了表征.     

N-[3-氰基-1-(2,6-二氯-4-三氟甲基苯基)-1H-吡唑-5-基]菊酰胺类化合物的合成及生物活性

为了寻求新的N-芳基吡唑类先导化合物, 用5种拟除虫菊酯类农药的活性基团——菊酸与高活性杀虫剂氟虫腈和其中间体5-氨基-3-氰基-1-(2,6-二氯-4-三氟甲基-苯基)吡唑在其氨基位置采用亚结构对接的方法合成得到了10个新的芳基吡唑菊酰胺类化合物. 经¹H NMR, ESI-MS和元素分析对化合物的结构进行了表征. 初步生物活性测定结果表明, 在37.5 mg/L浓度下, N-[3-氰基-1-(2,6-二氯-4-三氟甲基苯基)-4-(三氟甲基亚磺酰基)-1H-吡咯-5-基]-3-(2,2-二氯乙烯基)-2,2-二甲基环丙酰胺(3b)对小菜蛾Amaranthus spinosus抑制活性达到100%, LC₅₀为15.1 mg/L. 初步雌雄大鼠急性经口毒性综合评价属中毒级, 同时还检测了2-(4-氯苯基)-N-[3-氰基-1-(2,6-二氯-4-三氟甲基苯基)-1H-吡唑-5-基]-3-甲基丁酰胺(3i)的晶体结构.     

3-巯基-5-芳香基-4-芳基亚甲胺基-4H-1,2,4-三唑的合成及波谱研究

5-取代-4-氨基-3-巯基-1,2,4-三唑与芳香醛在弱酸性乙醇溶液中反应, 合成了一系列3-巯基-5-芳香基-4-芳基亚甲胺基-4H-1,2,4-三唑(3a～3d)及水溶性的3-巯基-5-(D-葡萄糖-1-基)-4-(4-氯代苯基)亚甲胺基-4H-1,2,4-三唑(3e)新化合物. 以元素分析, IR, NMR, MS实验技术对其结构进行了表征, 并研究其NMR波谱特征.     

2-(1-苯基-1H-四唑-5-硫基)-N-芳基乙酰胺的合成及其生物活性研究

采用微波法通过2-氯乙酰芳胺与1-苯基-1H-四唑-5-硫醇反应合成了一系列2-(1-苯基-1H-四唑-5-硫基)-N-芳基乙酰胺. 其结构经 IR, ¹H NMR, ¹³C NMR 和元素分析表征. 生物活性实验结果表明, 该类化合物在较低浓度下对油菜籽和小麦的生长表现出良好的促进作用.     

手性2-氨基-1-苯基乙醇类化合物的不对称合成研究进展

对近年来手性2-氨基-1-苯基乙醇类药物的不对称合成方法进行了总结和概述. 重点介绍了不对称氢化、CBS还原、不对称Henry反应等新方法在2-氨基-1-苯基乙醇类药物如R-沙丁胺醇、R-沙美特罗和D-索他洛尔等合成中的应用.     

离子液体中6-(2,3-环氧丙氧基)-2(1H)-喹啉酮及其衍生物的合成

6-(3-氨基-2-羟基丙基)-2-(1H)-喹啉酮衍生物被发现具有新的正性肌力的活性. 设计合成了一系列新的氨丙醇类喹啉酮化合物. 首先研究了6-羟基-2-(1H)-喹啉酮环氧化物2在离子液体中的合成, 该反应后处理简便, 收率高, 对环境友好. 然后用合成得到的2-(1H)-喹啉酮环氧化合物在离子液体中与一系列具有生物活性的有机碱反应, 合成了氨丙醇类2-(1H)-喹啉酮化合物3. 然后由6-羟基-2-(1H)-喹啉酮出发, 在离子液体中, 进行了一锅法合成氨丙醇类2-(1H)-喹啉酮化合物的研究. 制得的2b, 3b～3f 6个新化合物用IR, ¹H NMR, MS和元素分析进行了结构表征.     

1,3-偶极环加成合成新型3a,6a-二氢-4,6-二氧代吡咯啉并[3,4-d]吡唑类衍生物

α-氯代-4-氧代-4H-1-苯并吡喃-3-甲醛芳腙与N-取代苯基-马来酰亚胺在三乙胺作用下通过1,3-偶极环加成合成了一系列含3-(4-氧代-4H-1-苯并吡喃-3-基)-3a,6a-二氢-4,6-二氧代吡咯啉并[3,4-d]吡唑类衍生物. 化合物结构经元素分析, IR, ¹H NMR及MS确证.     

在离子液体中6-羟基-2(1H)喹啉酮的合成及反应性研究

6-羟基-2(1H)-喹啉酮是心血管和降压药物的重要中间体. 设计合成了一种在[Bmim]AlCl₄离子液体中合成6-羟基-2-(1H)-喹啉酮的新方法; 研究了离子液体中6-羟基-2(1H)-喹啉酮母体环上羰基、氨基和不饱和键部位的化学反应. 此法后处理简便, 收率高, 是一种环境友好的绿色化学合成技术.     

2(5H)-呋喃酮类化合物的合成研究新进展

含2(5H)-呋喃酮结构的化合物广泛存在于天然产物中, 具有多种生物活性. 对其合成方法进行了分类综述.     

微波辐射下2-氨基-7-甲基-4-芳基-5-氧代-4H,5H-吡喃并[4,3-b]吡喃-3-腈的一步合成

芳醛、丙二腈与6-甲基-4-羟基-2-吡喃酮在微波辐射下, 一步反应得到一系列2-氨基-7-甲基-4-芳基-5-氧代-4H,5H-吡喃并[4,3-b]吡喃-3-腈, 该反应时间短、产率较高、环境友好、后处理简单. 产物的结构经红外光谱、核磁共振谱和元素分析表征, 产物4g的结构经单晶X射线衍射进一步确证; 并对反应过程提出了可能的机理.     

Structural study and thermal behavior of novel interaction product of 4-amino-5-(furan-2-yl)-4H-1,2,4-triazole-3-thione with molecular iodine

Abstract

As a part of investigation of thyreostatic activity of mercapto-substituted triazoles, the structure, spectroscopic properties of 4-amino-5-(furan-2-yl)-4H-1,2,4-triazole-3-thione were obtained. 4-amino-5-(furan-2-yl)-4H-1,2,4-triazole-3-thione forms steady charge-transfer complex in dilute chloroform solution, coordinating one iodine molecule (lgβ?=?3.47). The reaction product of 4-amino-5-(furan-2-yl)-4H-1,2,4-triazole-3-thione is presented by uncharged adduct: C₆H₆N₄OS·I₂. The crystal structure of the adduct was studied in detail by single crystal X-ray diffraction. The results of thermogravimetric analysis revealed the stability of adduct in a solid state at the temperature range 50–500?°C.     

Isopropylidenemalononitrile in the synthesis of 2-amino-4,6,6-trimethylcyclohexa-2,4-diene-1,1,3-tricarbonitrile, 6-amino-2-(4-methoxybenzoylmethylsulfanyl)-4,4-dimethyl-1,4-dihydropyridine-3,5-dicarbonitrile, and fused 2-aminopyrans according to Michael

Michael reactions of isopropylidenemalononitrile with cyanothioacetamide (in the presence of 4-methoxyphenacyl bromide), cyclohexane-1,3-dione, and 4-hydroxycoumarin, gave 6-amino-2-(4-methoxy-benzoylmethylsulfanyl)-4,4-dimethyl-1,4-dihydropyridine-3,5-dicarbonitrile, 2-amino-4,4-dimethyl-5-oxo-5,6,7,8-tetrahydro-4H-chromene-3-carbonitrile, and 2-amino-4,4-dimethyl-5-oxo-4H,5H-pyrano[3,2-c]-chromene-3-carbonitrile, respectively. In the reaction of isopropylidenemalononitrile with cyanoacetamide, only dimerization product of the former, 2-amino-4,6,6-trimethylcyclohexa-2,4-diene-1,1,3-tricarbonitrile, was isolated. Its structure was proved by X-ray analysis.     

Synthesis of 2-(2′,3′-dihydroxypropyl)-5-amino-2H-1,2,4-thiadiazol-3-one and 3-(2′,3′-dihydroxypropyl)-5-amino-3H-1,3,4-thiadiazol-2-one

The synthesis of two new acyclic nucleoside analogs, 2-(2′,3′-dihydroxypropyl)-5-amino-2H-1,2,4-thiadiazol-3-one (1) and 3-(2′,3′-dihydroxypropyl)-5-amino-3H-1,3,4-thiadiazol-2-one (2), is reported. The first compound, 1, was obtained by reaction of 3-chloro-1,2-propanediol with the sodium salt of 5-amino-2H-1,2,4-thiadiazol-3-one (3) in anhydrous dimethylformamide. Similarly, 5-amino-3H-1,3,4-thiadiazol-2-one (4) reacted with 3-chloro-1,2-propanediol to give 2. The thiadiazole 4 was prepared by condensation-cyclization of hydrazothiodicarbonamide (9).     

Hydrolysis Reactions and Resolution of (±)-2-Acetamido-3-hydroxy-1-(4-nitrophenyl)-1-propanone

IntroductionChloramphenicol,which was isolated fromStreptomyces venezuelae in 1 947[1] ,is used as abroad- spectrum antibiotic possessing activityagainst many Gram- negative and Gram- positivemicroorganisms. (± ) - 2 - Acetamido- 3 - hydroxy- 1 -(4- nitrophenyl) - 1 - propanone[(± ) - 1 ]is one of theintermediates of producing chloramphenicol.Petrow et al.[2 ] reported some transformations of(± ) - 1 in hydrolysis reactions. However,thereaction products were complicated under multiplehydr…     

Novel Synthesis of 5-Amino-3-bromo-1-(tert-butyl)-1H-pyrazole-4-carbonitrile: A Versatile Intermediate for the Preparation of 5-Amino-3-aryl-1-(tert-butyl)-1H-pyrazole-4-carboxamides

A simple, novel, and efficient route for the synthesis of 5-amino-3-aryl-1-(tert-butyl)-1H-pyrazole-4-carboxamides 1 has been devised. Preparation of pyrazole bromide 3 from potassium tricyanomethanide can be accomplished in only two steps in good yield and features a selective Sandmeyer reaction on the corresponding diaminopyrazole. This allows for a more versatile synthesis of 5-amino-3-aryl-1-(tert-butyl)-1H-pyrazole-4-carboxamides 1 than was previously possible.     

Efficient synthesis of 3H-imidazo[4,5-b]pyridines from malononitrile and 5-amino-4-(cyanoformimidoyl)imidazoles

1-Aryl-5-amino-4-(cyanoformimidoyl)imidazoles 2 were reacted with malononitrile under mild experimental conditions and led to 3-aryl-5,7-diamino-6-cyano-3H-imidazo[4,5-b]pyridines 5, when the reaction was carried out in the presence of DBU, or to 3-aryl-5-amino-6,7-dicyano-3H-imidazo[4,5-b]pyridines 3, in its absence. Both reactions evolved from the adduct formed by nucleophilic attack of the malononitrile anion to the carbon of the cyanoformimidoyl substituent. A 5-amino-1-aryl-4-(1-amino-2,2-dicyanovinyl)imidazole 4 was isolated when this reaction was carried out in the presence of DBU. The structure of compound 4 was confirmed by spectroscopic methods and by reaction with triethyl orthoformate and with acetic anhydride, leading respectively to 9-aryl-6-(cyanomethylidene)purines 11 and 12. Imidazole 2b was also reacted with ethyl acetoacetate, a carbon acid with a pK(a) comparable to that of malononitrile. Similar reaction conditions were used and the product isolated was a 6-carbamoyl-1,2-dihydropurine 10, showing that a different mechanism was operating in this case.     

一种制备(1R,3S)-3-氨基-1-环己烷羧酸的新方法

介绍了一种简单的制备(1R,3S)-3-氨基1环己烷羧酸的方法。以环己烷-1,3-二羧酸的顺反混合物为原料。经过关环得顺式的酸酐,然后酯化,在脂肪酶AY-30的作用下进行去对称性水解。得光学活性的环己烷-1,3-二羧酸的单乙酯产物,经过改进的Curtis重排反应后,羧酸基团转变为氨基。然后经过酯水解、去保护基团,得到光学纯的(1R,3S)-3-氨基-1-环己烷羧酸。     

Synthesis of 1-(dihydroxypropyl)-5-substituted uracils

Novel 1-(dihydroxypropyl)-5-substituted uracils were synthesized in the reaction of 1-(4-nitrophenyl)-5-substituted uracil derivatives with appropriate aminopropanediols under mild conditions. In the case of 3-amino-1,2-propanediol both racemic and enantiomerically enriched products were obtained. These compounds may be considered as new building blocks for oligonucleotide synthesis.     

Reaction of sulfene and dichloroketene with open-chain N,N-disubstituted α-aminomethyleneketones. Synthesis of N,N-disubstituted 4-amino-3,4-dihydro-(5-methyl-6-phenyl)(5,6-diphenyl)-1,2-oxathiin 2,2-dioxides and of 4-amino-3-chloro-5-methyl-6-phenyl-2H-pyran-2-ones

Cycloaddition of sulfene to N,N-disubstituted 3-amino-2-methyl-1-phenyl-2-propen-1-ones (I) and 3-amino-1,2-diphenyl-2-propen-1-ones (II) occurred in good to moderate yield only in the case of aliphatic N-substitution to give 4-dialkylamino-3,4-dihydro-(5-methyl-6-phenyl)(5,6-diphenyl)-1,2-oxathiin 2,2-dioxides. Polar 1,4-cycloaddition of dichloroketene to I and II occurred only in the former case, giving in good to moderate yield N,N-disubstituted 4-amino-3,3-dichloro-3,4-dihydro-5-methyl-6-phenyl-2H-pyran-2-ones which were dehydrochlorinated with DBN to N,N-disubstituted 4-amino-3-chloro-5-methyl-6-phenyl-2H-pyran-2-ones. In the reaction of 2-methyl-1-phenyl-3-diphenylamino-2-propen-1-one with dichloroketene, a product was isolated which was proven by uv, ir, nmr and chemical evidence to be the dipolar ion VI, the supposed intermediate of the polar 1,4-cycloaddition of dichloroketene to N,N-disubstituted enaminones.     

Synthesis, structure and properties of N-acetylated derivatives of methyl 5-amino-1H-[1,2,4]triazole-3-carboxylate

Methyl 5-amino-1H-[1,2,4]triazole-3-carboxylate hydrochloride (1). and free ester (2). were obtained and 2 was reacted with Ac(2)O to give the acetylated products 3-6. Compounds 1-6 were studied using HPLC, GC-MS, FTIR and multinuclear NMR spectroscopy, including the cross-polarisation magic angle spinning (CPMAS) technique. The results of the acetylation of 2 were compared to those of the acetylation of 5-amino-1H-[1,2,4]triazole, and for 2 a significant decrease in the susceptibility to acetylation was found. The reaction of 2 with Ac(2)O at 20 degrees C, regardless of the amount and the concentration of the latter, including neat Ac(2)O, proceeds fully regioselectively and leads to one product: methyl 1-acetyl-5-amino-1H-[1,2,4]triazole-3-carboxylate (3). In sharp contrast to 5-amino-1H-[1,2,4]triazole, neither an additional monoacetylated isomer, whether annular or exocyclic, nor any diacetylated derivative could be detected. The diacetylation of 2 requires the process to be carried out in neat boiling Ac(2)O and, as in the case of 5-amino-1H-[1,2,4]triazole, gives two diacetylated isomers. These are methyl 1-acetyl-3-(acetylamino)-1H-[1,2,4]triazole-5-carboxylate (4) and 1-acetyl-5-(acetylamino)-1H-[1,2,4]triazole-3-carboxylate (5). Hypothetical pathways of their formation have been suggested. A mixture of 4 and 5 upon hydrolysis of the ring acetyl group gives the monoacetylated derivative methyl 5-(acetylamino)-1H-[1,2,4]triazole-3-carboxylate (6). The spectroscopic, structural and conformational characteristics of compounds 1-6 have been given and methods for their preparation have been provided.