3-芳基-5-巯基-1,2,4-三唑的亲核取代反应研究

以3-芳基-5-巯基-1,2,4-三唑为原料合成了20个3-芳基-1,2,4-三唑-5-巯基乙酸乙酯(2a～e)、3-芳基-1,2,4-三唑-5-巯基乙酸(3a～e)、3-芳基-5,6-二氢噻唑并[2,3-c]均三唑(5a～e)和3-芳基-6,7-二氢均三唑并[3,4-b][1,3]噻嗪(6a～e)。研究了3a～e在微波辐射下的环化反应，合成了5个3-芳基-5-氧代-6H-噻唑[2,3-c]均三唑(4a～e)。产物经元素分析、红外、核磁共振以及质谱方法确定了结构。初步研究了代表化合物的生物活性。     

酰胺基硫脲及其相关杂环化合物的研究 VI:3-(4'-吡啶基)-4-芳基-1,2,4-三唑-5-烃硫醚类化合物的合成

在碱性介质中, 用碘甲烷对3-(4'-吡啶基)-4-芳基-1,2,4-三唑-5-硫酮进行亲核取代反应, 合成了3-(4'-吡啶基)-4-芳基-1,2,4-三唑-5-烃硫醚类化合物. 用元素分析, 红外光谱, 核磁氢谱和紫外光谱研究了合成化合物的结构.     

酰氨基硫脲及其相关杂环衍生物的研究——ⅩⅤ.3-[5-(3-吡啶)-四唑-2-亚甲基]-4-芳基-1,2,4-三唑-5-烃硫醚类化合物的合成及其抗菌活性

以3-〔5-(-3吡啶)-四唑-2-亚甲基〕-4-芳基-1,2,4-三唑-5-硫酮为原料合成了19个3-〔5-(3-吡啶)-四唑-2-亚甲基〕4-芳基-1,2,4-三唑-5-烃硫醚类合化物,经元素分析、红外、核磁以及质谱确定了其结构,观察了化合物对枯草芽抱杆菌、大肠杆菌、变形杆菌以及金黄色葡萄菌的抑制,其中以化合物3_(α-k)的抑制活性最强。     

一步法合成噻唑并[3,2-b](1,2,4)-三唑类衍生物的研究

以3-芳基-5-巯基-1,2,4-三唑为原料, 在酸性条件下与乙酰丙酮和乙酰乙酸乙酯一步成环, 制备得到12种新的2-芳基-5-取代-6-甲基噻唑并[3,2-b](1,2,4)-三唑类衍生物. 所有化合物结构经IR, 1H NMR, 13C NMR 和MS及元素分析确证.     

2-{5-[(1H-1,2,4-三唑-1-基)甲基]-4-苯基-4H-1,2,4-三唑-3-硫基}-1-芳基乙酮类化合物的合成、表征及生物活性测试

通过α-卤代芳基乙酮和5-[(1H-1,2,4-三唑-1-基)甲基]-4-苯基-2H-1,2,4-三唑-3(4H)-硫酮反应, 合成了11个新的2-{5-[(1H-1,2,4-三唑-1-基)甲基]-4-苯基-4H-1,2,4-三唑-3-硫基}-1-芳基乙酮类化合物. 其结构经元素分析, IR, ¹H NMR等确证, 并用X射线单晶衍射测定了化合物6f的晶体结构. 生物活性测试结果表明, 部分化合物具有一定的杀菌活性.     

3-芳基-6-对氯苯甲酰氨基均三唑并[3,4-b]-1,3,4-噻二唑的 合成及生物活性

利用3-芳基-4-氨基-5-巯基-1,2,4-均三唑和对氯苯甲酰异硫氰酸酯在乙腈中反应, 得到一系列3-芳基-6-对氯苯甲酰氨基均三唑并[3,4-b]-1,3,4-噻二唑, 用1H NMR, IR, MS和元素分析确定了其结构, 并对其进行了抑菌活性测试.     

3-(3＇-芳基-5＇-硫酮-1＇,2＇,4＇-三唑-4＇-基)-氨甲酰基色酮类化合物的合成

报道3-甲酰基色酮经Jones试剂氧化后得到3-羧基色酮,再与3-芳基-4-氨基-5-硫酮-1,2,4-三唑在POl3作用下,得到一系列3-(3＇-芳基-5＇-硫酮-1＇,2＇,4＇-三唑-4-＇-基)-氨甲酰基色酮类化合物.所有化合物的结构均经IR,LCMS,1H NMR,元素分析确证.     

铜催化一锅法合成1,2,4-三唑衍生物

以亚胺酯盐酸盐和脒为原料,在铜催化下一锅法合成对称及非称二取代1,2,4-三唑衍生物。之前报道的合成方法仅限于合成对称芳基二取代1,2,4-三唑衍生物,在合成非对称二取代1,2,4-三唑时,由于底物的自聚和混聚造成不对称和对称的1,2,4-三唑产物同时产生,并且由于它们非常接近的R_f值而难以分离。该方法解决了从简单底物出发难以直接合成非对称芳基二取代1,2,4-三唑衍生物的问题,为合成非对称芳基二取代基1,2,4-三唑衍生物提供了一种有效的合成方法。     

3-烷基/芳基-6-(2′,4′-二氯苯基)-7H-1,2,4-三唑[3,4-b]-1,3,4-噻二嗪的合成及波谱性质

以间二氯苯与氯乙酰氯反应,生成ω-氯代-2,4-二氯苯乙酮(1),再使之分别与3-烷基/芳基-4-氨基-5-巯基-1,2,4-三唑(2a～2l)反应,合成了12种新的3-烷基/芳基-6-(2′,4′-二氯苯基)-7H-1,2,4-三唑并[3,4-b]1,3,4-噻二嗪(4a～4l).利用EA,IR,1H NMR确定了其结构,并提出该反应的可能机制.     

2-多氟烷基取代和葡萄糖基取代的2,4-二氢-1,2,4-三唑-3-硫酮类席夫碱的合成及其杀虫活性

为改善三唑类化合物的生物活性,以5-苯基-4-氨基-1,2,4-三唑-3-硫酮为原料,将其与芳香醛在冰醋酸体系中反应,得到5-苯基-4-芳基亚甲氨基-1,2,4-三唑-3-硫酮类席夫碱(4a～4i).在此基础上,化合物4a～4i分别与多氟烷基碘代烷和溴代乙酰基葡萄糖反应合成了一系列2,4-二氢-1,2,4-三唑-3-硫酮类席夫碱的多氟烷基取代物5a～5r和葡萄糖基取代物6a～6d,并用1H NMR,19F NMR,IR和MS谱以及元素分析表征了它们的结构.初步生物活性测试结果表明,部分目标化合物具有明显的杀虫活性.     

Synthesis of heterocycles. Part VI. Synthesis and antimicrobial activity of some 4-amino-5-aryl-1,2,4-triazole-3-thiones and their derivatives

4-Amino-5-aryi-1,2,4-triazole-3-thiones I react with acid chlorides to yield 4-acylamino-5-aryl-1,2,4-triazole-3-thiones II. Compounds I also react with methylene iodide, chloroacetonitrile and methyl bromoacetate to give bis-(4-amino-5-aryl-1,2,4-triazol-3-ylthio)methanes III, 4-amino-5-aryl-3-cyanomethylthio-1,2,4-triazoles IV and 4-amino-5-aryl-3-carbomethoxymethylthio-1,2,4-triazoles V, respectively. Compounds V react with hydrazine hydrate to give the corresponding acid hydrazides VI which in turn condenses with acid chlorides and aldehydes to afford respectively 1-[(4-amino-5-aryl-1,2,4-triazol-3-ylthio)acetyl]-2-aroylhydrazines VII and aryl methylene (4-amino-5-aryl-1,2,4-triazol-3-ylthio)acethydrazones VIII. The antimicrobial activities of the above compounds were screened against different strains of bacteria and fungi.     

Synthesis and Transformations of 2-R-5-Aryl-5,6-dihydro-7H-[1,2,4]-triazolo[5,1-b][1,3]thiazin-7-ones

A new procedure for preparation of 2-R-5-aryl-5,6-dihydro-7H-[1,2,4]triazolo[5,1-b][1,3]thiazin-7-ones by condensation of 5-R-1,2,4-triazole-3-thiones with 3-arylacryloyl chlorides was developed. The thiazine ring of the [1,2,4]triazolo[5,1-b][1,3]thiazin-7-ones is easily cleaved by treating with ammonia and hydrazine affording amides and hydrazides of 3-aryl-3-(1H-1,2,4-triazol-5-ylsulfanyl)propanoic acids. The latter react with isothiocyanates furnishing carbamoyl thiohydrazides of 3-aryl-3-(1H-1,2,4-triazol-5-ylsulfanyl)propanoic acids that in alkaline media undergo cyclization into 4-aryl-5-[2-(4H-1,2,4-triazol-5-ylsulfanyl)-2-phenylethyl]-2,4-dihydro-3H-1,2,4-triazole-5-thiones.     

NOVEL SYNTHESIS OF CONDENSED HETEROCYCLIC SYSTEMS CONTAINING 1,2,4-TRIAZOLE RING

3-Aryl-6,7-dihydro-s-triazolo[3,4-b][1,3]thiazines and 3-aryl-5,6-dihydro-thiazolo[2,3-c]-s-triazoles were synthesized by nucleophilic substitution of 3-aryl-5-mercapto-1,2,4-triazoles with 1,3-dibromopropane and 1,2-dichloroethane. And the bis-Mannich reaction of 3-aryl-5-mercapto-1,2,4-triazoles with formaldehyde has been studied.     

Synthesis of new bis-1,2,4-triazole derivatives

A series of new 1,2/1,3-bis[o-(N-methylidenamino-3-aryl-5-phenyl-4H-1,2,4-triazole-4-yl)phenoxy]ethane/propane derivatives 4 were prepared in good yields by treatment of 4-amino-3-aryl-5-phenyl-4H-1,2,4-triazoles 2 with certain bis-aldehydes 1.Compounds 4 were reduced with NaBH(4) to afford the corresponding 1,2/1,3-bis[o-(N-methylamino-3-aryl-5-phenyl-4H-1,2,4-triazole-4-yl)phenoxy]ethane/propane derivatives 5. All new compounds were characterized by IR, (1)H-NMR, (13)C-NMR and mass spectral data.     

Synthesis of new 1,2,4-oxadiazolidin-3-ones by cycloaddition of 2-alkyl-3-aryloxaziridines with chlorosulfonylisocyanate

2-Alkyl-4-chlorosulfonyl-5-aryl-1,2,4-oxadiazolidin-3-ones 5 were prepared via cycloaddition of 2-alkyl-3-aryloxaziridines 3 with chlorosulfonylisocyanate. The structure of 5 was proved by a crystal X-ray analysis. Hydrolysis of 5 in the presence of triethylamine afforded 2-alkyl-5-aryl-1,2,4-oxadiazolidin-3-ones 6.     

Reaction of 2-Aryl-5-R-5,6-dihydro-7H-[1,2,4]-triazolo[5,1-<Emphasis Type="Italic">b</Emphasis>][1,3]thiazin-7-ones with Aryl Bromomethyl Ketones and Benzyl Bromide

The products of the reaction of 2-aryl-5-R-5,6-dihydro-7H-[1,2,4]triazolo[5,1-b][1,3]thiazin-7-ones with aryl bromomethyl ketones are 2-aryl-7H-[1,2,4]triazolo[5,1-b][1,3]thiazin-7-ones and aryl methyl ketones or 2,5-diaryl[1,3]thiazolo[3,2-b][1,2,4]triazoles and 3-phenyl-2-propenoic acid, depending on the structure of R. The reaction of 2-aryl-5-R-5,6-dihydro-7H-[1,2,4]triazolo[5,1-b][1,3]thiazin-7-ones with benzyl bromide yields 5-aryl-3-benzylthio-4H-1,2,4-triazoles and 3-aryl-2-propenoyl bromide. __________ Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 905–909, June, 2005.     

Aminolysis of 2-Aryl-5-R-5,6-dihydro-7H-[1,2,4]triazolo[5,1-<Emphasis Type="Italic">b</Emphasis>]1,3]thiazin-7-ones

We have established that the products of aminolysis of 2-aryl-5-R-5,6-dihydro-7H-[1,2,4]triazolo-[5,1-b][1,3]thiazin-7-ones in boiling ethanol are 3-R-3-(5-aryl-4H-1,2,4-triazol-3-ylsulfanyl)-propanamides, and at 180°C–210°C (depending on the structure of the substituent R): 3-phenyl-4,5-dihydro-1H-1,2,4-triazoline-5-thione and 3-arylacrylamides or 3-(3-aryl-5-thioxo-4,5-dihydro-1H-1,2,4-triazol-1-yl)propanamides. __________ Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1587–1592, October, 2005.     

The synthesis and stability of some perfluoroalkl- and perfluoroalkylene-1,2,4- and 1,3,4-oxadiazoles

5-Perfluoroalkyl-3-phenyl-1,2,4-oxadiazoles have been synthesised directly from benzamidoxime and perfluoromonoacyl chlorides. However, a more complex pattern of products was observed in the reaction between arylamidoximes and perfluorodiacyl chlorides. Depending on the conditions, the products were O, O′-perfluorodiacyl di(arylamidoximes), α, ω-bis(3-aryl-1,2,4-oxadiazol-5-yl) perfluoroalkanes and arylamidoxime (3-aryl-1,2,4-oxadiazol-5-yl)perfluorocarboxylates.     

H14[NaP5W30O110] as a Heterogeneous Recyclable Catalyst for the Synthesis of 6,8-Dimethyl-3-aryl-[1,2,4]triazolo[3,4-b][1,3,4]thiazepine Derivatives

6,8-Dimethyl-3-aryl-[1,2,4]triazolo[3,4-b][1,3,4]thiazepine derivatives were synthesized by cyclodehydration of 3-aryl-4-amino-5-mercapto-1,2,4-triazole with 2,4-pentanedione in the presence of a catalytic amount of Preyssler catalyst under very mild conditions.     

Synthesis of 6-aryl-1,3-dimethyl-6,7-dihydro-6-azalumazin-7-(6H)ones and their conversion into 2-aryl-1,2,4-triazine-3,5-(2H,4H)odiones. A new synthesis of 1-aryl-6-azauracils

Treatment of 6-amino-5-arylazo-1,3-dimethyluracils with urea or N,N′-carbonyldiimidazole gave the respective 6-aryl-1,3-dimethyl-6,7-dihydro-6-azalumazin-7-(6H)ones, which were hydrolyzed with alkali to afford 2-aryl-2,3,4,5-tetrahydro-3,5-dioxo-1,2,4-triazine-6-carboxylic acids (1-aryl-6-azauracil-5-carboxylic acids). Thermal decomposition of these carboxylic acids gave the corresponding 2-aryl-1,2,4-triazine-3,5-(2H,4H)diones (1-aryl-6-azauracils). Methylation of the latter with methyl iodide gave the corresponding 2-aryl-4-methyl-1,2,4-triazine-3,5-(2H,4H)diones (1-aryl-3-methyl-6-azauracils).