含1,3,4-(口恶)二唑取代的酰基硫脲的合成及杀菌活性

大量文献报道了1,3,4-(口恶)二唑的合成及广泛的生物活性[1-3],酰基硫脲类化合物也因其广谱的生物活性引起了人们浓厚的研究兴趣[4-5].根据活性因子叠加的原理,本文将一系列1,3,4-(口恶)二唑引入到酰基硫脲中,从对氯苯氧乙酸出发,得到的酰基异硫氰酸酯再与一系列2-氨基-5-芳基-1,3,4-(口恶)二唑反应,合成了10个酰基硫脲类化合物.所有化合物均经元素分析、红外光谱、核磁共振谱和质谱确认.同时对所有化合物进行了生物活性测试.合成路线如下.     

N-（5-对硝基苯基-1，3，4-噁二唑-2-基）-N′-芳酰基硫脲的合成及其生物活性

以2-氨基-5-对硝基苯基-1,3,4-噁二唑与芳酰基异硫氰酸酯反应,设计合成了6个新的芳酰基硫脲类化合物。其结构经1H NMR,IR和元素分析确认。初步生物测试结果表明,大多数化合物具有较好的抑菌活性。     

N-(5-对硝基苯基-1,3,4-噁二唑-2-基)-N''''-芳酰基硫脲的合成及其生物活性

以2-氨基-5-对硝基苯基-1,3,4-噁二唑与芳酰基异硫氰酸酯反应,设计合成了6个新的芳酰基硫脲类化合物.其结构经1H NMR,IR和元素分析确认.初步生物测试结果表明,大多数化合物具有较好的抑菌活性.     

N-1，3，4-噁二唑基-N′-呋喃甲酰基硫脲的合成及杀菌活性研究

N-1;3;4-噁二唑基-N′-呋喃甲酰基硫脲的合成及杀菌活性研究;呋喃;噁二唑;酰基硫脲;合成;杀菌活性     

N-1，3，4-噁二唑基-N′-呋喃甲酰基硫脲的合成及杀菌活性研究

N-1;3;4-噁二唑基-N′-呋喃甲酰基硫脲的合成及杀菌活性研究;呋喃;噁二唑;酰基硫脲;合成;杀菌活性     

2-芳基-3-N-丙酰基-5-(2-溴-4-氟苯基)-1，3，4噁二唑啉类衍生物的合成及抗菌活性

2-芳基-3-N-丙酰基-5-(2-溴-4-氟苯基)-1;3;4噁二唑啉类衍生物的合成及抗菌活性;噁二唑啉衍生物;合成;结构表征;抑菌活性     

N-1,3,4-(口恶)二唑基-N′-呋喃甲酰基硫脲的合成及杀菌活性研究

将呋喃环、1,3,4-(口恶)唑环2个杂环同时引入到酰基硫脲中,合成了10个未见报道的酰基硫脲类化合物. 所有化合物的结构均经元素分析、红外光谱、核磁共振氢谱和质谱确认. 抑菌法生物活性测试表明,各目标产物对黄瓜灰霉病菌的抑制效果较好,最高可达97%.     

2,5-取代-1,3,4-噁二唑衍生物的合成与杀菌活性

利用生物活性亚结构拼接原理,将吡啶环、噻唑环引入到1,3,4-噁二唑母体结构中,设计并合成了一系列新型含吡啶(噻唑)的1,3,4-噁二唑衍生物.通过IR,1H NMR,EI-MS及元素分析等方法对所合成的化合物进行了结构表征.代表化合物2-(6-氯吡啶-3-甲硫基)-5-(吡啶-4-基)-1,3,4-噁二唑(I)经单晶X衍射证实了结构.初步测定了所合成化合物的杀菌活性,并比较了在1,3,4-噁二唑母体结构中引入噻唑杂环和引入吡啶杂环后其杀菌活性的差异.结果表明:目标化合物对测试的5种菌均具有一定的杀菌活性,对水稻纹枯病的抑制效果普遍优于对其它菌种的抑制效果;在1,3,4-噁二唑母体结构中引入噻唑杂环比引入吡啶杂环对其杀菌活性更有利.     

3,4-二芳基-5-芳氧甲基异噁唑的合成

由于异噁唑衍生物具有广泛的除草、杀虫和药物活性,其合成方法近年来一直引起关注.以3-芳基-5-溴甲基异噁唑为原料,经溴代、醚化、Suzuki偶联反应合成了一系列3,4-二取代芳基-5-芳氧甲基异噁唑化合物,初步的生物活性测试结果显示,部分化合物对粘虫显示出一定的杀虫活性.     

2-取代-5-吡唑基-1，3，4-恶二唑类化合物的合成及生物活性

以5-吡唑甲酰肼和取代羧酸为起始物,运用"一锅煮"法合成了一系列2-取代-5-吡唑基-1,3,4-二唑.此外,还合成了1-苯酰基-2-吡唑酰基肼.初步生物活性测定结果表明,部分化合物有较好的杀菌和除草活性.     

Synthesis and mass-spectrometric study of 2-amino- and 2-chloro-5-aryl-1,3,4-thiadiazoles

The cyclization of aldehyde thiosemicarbazones with ferric chloride yielded 2-amino-5-aryl-1,3,4-thiadiazoles, forming 2-chloro-5-aryl-1,3,4-thiadiazoles in the Sandmeyer reaction. The mass-spectrometric behavior of the 2-amino- and 2-chloro-5-aryl-1,3,4-thiadiazoles was studied; the typical routes of fragmentation characteristic of each group of compounds were found.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1416–1419, October, 1986.     

Thermal ring transformation of 5-aryl-2-carbazoyl-1,2,3,4-tetrazole derivatives

Unstable 5-aryl-2-(3-benzylidene-2-phenylcarbazoyl)-1,2,3,4-tetrazoles 8 have been prepared. By thermal ring transformation, they gave 5-aryl-2-(2-benzylidene-1-phenylhydrazino)-1,3,4-oxadiazoles 9. , Hydrazinolysis of 9 afforded 5-aryl-2-(1-phenylhydrazino)-1,3,4-oxadiazoles 10. Elimination of a molecule of benzonitrile from 9 on heating converted them into 2-anilino-5-aryl-1,3,4-oxadiazoles 11.     

Syntheses of arylsulfonyl-1,3,4-thiadiazoles

Reaction of sodium arylsulfinate with 2-aryl-5-chloro-1,3,4-thiadiazole gave 2-aryl-5-arylsulfonyl-1,3,4-thiadiazole (3) in good yield. Starting from readily available 2-amino-5-benzylmercapto-1,3,4-thiadiazole compound 7 was obtained in three steps in moderate yield. Reaction of compound 7 with sodium arylsulfinate afforded 2,5-diarylsulfonyl-1,3,4-thiadiazole ( 11 ). Oxidation of compound 10 with hydrogen peroxide in acetic acid gave 2-arylsulfonyl-5-benzylsulfonyI-1,3,4-thiadiazole ( 12 ), in high yield.     

Synthesis and anticonvulsant activity of 2-aryl-3,4-dialkyltetrahydro-1,3,4-oxadiazines and 2-aryl-3,4-dialkyltetrahydro-1,3,4-oxadiazin-5-ones

Several 2-aryl-3,4-dialkyltetrahydro-1,3,4-oxadiazines have been synthesized from 2-(1,2-dialkylhydrazino)ethanol (2) and aromatic aldehydes. Also, three 2-aryl-3,4-dialkyltetrahydro-1,3,4-oxadiazin-5-ones were obtained from the reaction of 1,2-dialkylglycolylhydrazine (5) and aromatic aldehydes. These compounds exhibited activity in the maximal electroshock seizure test.     

Anodic formation of 3,6-diaryl-[1,2,4]triazolo[3,4-b][1,3,4]thiadiazoles and 2(3-aryl-5-methyl-1H-[1,2,4]triazol-1-yl)-5-aryl-1,3,4-thiadiazoles

3,6-Disubstituted 1,2,4-triazolo[3,4-b][1,3,4]thiadiazoles together with the unknown systems 2-(3-aryl-5-methyl-1H-[1,2,4]triazol-1-yl)-5-aryl-1,3,4-thiadiazoles were obtained by anodic oxidation, under aprotic conditions, of aryl aldehyde N-(5-aryl-1,3,4-thiadiazol-2-yl) hydrazones. Mechanistic proposals are given.     

Synthesis and antibacterial activities of novel imidazo[2,1-b]-1,3,4-thiadiazoles

2-Amino-5-(2-aryl-2H-1,2,3-triazol-4-yl)-1,3,4-thiadiazoles 2-4 have been synthesized by the reaction of 2-aryl-2H-1,2,3-triazole-4-carboxylic acids 1 with thiosemicarbazide. Their reaction with phenacyl (p-substituted phenacyl) bromides led to formation of the respective 6-aryl-2-(2-aryl-2H-1,2,3-triazol-4-yl)imidazo[2,1-b]-1,3,4-thiadiazoles 5. Reactivity of the latter fused ring towards reaction with different electrophilic reagents afforded the corresponding 5-substituted derivatives 6-8. The structure of the above compounds was confirmed from their spectral characteristics. Some of these compounds were found to possess slight to moderate activity against the microorganisms Staphylococcus aureus, Candida albicans, Pseudomonas aeruginosa, and Escherichia coli.     

Studies on heterocyclic primary amines,I. reaction of 2-amino-5-aryl-1,3,4-oxadiazoles with phosphorus pentachloride

Stable N-(5-aryl-1,3,4-oxadiazol-2-yl)phosphorimidic trichlorides (II) are obtained by refluxing 2-amino-5-aryl-1,3,4-oxadiazoles (I) with one equivalent of phosphorus pentachloride in dry benzene. The reactions of the phosphorimidic trichlorides were also studied.     

Reaction of 5-aryl-1,3,4-oxadiazole-2(3H)-thiones with chloromethyl alkyl ethers

3-Alkoxymethyl-5-aryl-1,3,4-oxadiazole-2(3H)-thiones were synthesized. The direction of alkylation of 5-aryl-1,3,4-oxadiazoline-2-thiones and their potassium salts was studied relative to the substrate, alkylating agent, solvent, and reaction conditions.Institute of Plant Chemistry, Academy of Sciences of the Republic of Uzbekistan, 7001 70 Tashkent, Uzbekistan. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 9, pp. 1249–1252, September, 1999.     

Synthesis of 2-aryl-5H-[1,3,4]-thiadiazolo[2,3-b]quinazolin-5-ones

3-Amino-2-thioxo-1,2,3,4-tetrahydroquinazolin-4-ones were converted into 2-aryl-5H-[1,3,4]thiadiazolo[2,3-b]quinazolin-5-ones on treatment with carboxylic acids and POCl₃. 3-Arylmethylidenamino-2-thioxo-1,2,3,4-tetrahydroquinazolin-4-ones also cyclized to 2-aryl-5H-[1,3,4]thiadiazolo[2,3-b]quinazolin-5-ones when oxidized with potassium chlorate in acetic acid, but on heating they were deaminated to give 2-thioxo-1,2,3,4-tetrahydroquinazolin-4-one and aryl nitriles. __________ Translated from Khimiya Geteotsiklicheskikh Soedinenii, No. 5, 787–791, May, 2006.     

An efficient synthesis of conjugated 5-aryl-1,3,4-oxadiazoles from 3-heteroarylacrylohydrazides and acid chlorides

New derivatives of 5-aryl-2-[2-(2-furyl)ethenyl]-1,3,4-oxadiazoles and 5-aryl-2-[2-(2-thienyl)ethenyl]-1,3,4-oxadiazoles are synthesized in a stepwise procedure through intermediate acyclic N′-arylcarbonyl-N-[2-(2-heteroaryl)acryloyl]hydrazines, starting from 3-(2-heteroaryl)acrylic acid hydrazides and acid chlorides. A facile one-pot methodology leading to the final 1,3,4-oxadiazoles is also described.