1-取代芳基-4-乙氧羰基-5-酰胺基-1, 2, 3-三唑的合成及 抗菌性能的研究

报道了1-取代芳基-4-乙氧羰基-5-氨基-1,2,3-三唑同各种酰氯的反应,制得23种新型衍生物1-芳基-4-乙氧羰基-5-酰胺基-1,2,3-三唑。讨论了产物的收率与所用酰化试剂的关系,新化合物的结构经IR,^1HNMR,MS及元素分析确证,并评价了这些化合物的抗菌性能。     

几种新的氮杂-Wittig试剂. 1-取代芳基-4-乙氧羰基-5-三苯膦化亚胺基-1,2,3-三唑的合成与表征

以1-取代芳基-4-乙氧羰基-5-胺基-1,2,3-三唑为原料合成了5种新的氮杂-Wittig试剂--1-取代芳基-4-乙氧羰基-5-三苯膦化亚胺基-1,2,3-三唑.其结构经元素分析、IR,1H NMR和MS确定.     

1-(4-取代苯基)-4-苯基-5-(2-羟基苄基)氨基-1,2,3-三唑类衍生物的合成及抑菌活性

将邻羟苯基引入1,2,3-三唑结构中, 设计合成了10个1-(4-取代苯基)-4-苯基-5-取代-1,2,3-三唑类衍生物. 首先, 以对位取代的芳胺为原料, 经重氮化、叠氮化、闭环和缩合反应制得1-(4-取代苯基)-4-苯基-5-水杨醛亚胺-1,2,3-三唑类衍生物(3a~3e), 再用硼氢化钠还原制得1-(4-取代苯基)-4-苯基-5-(2-羟基苄基)氨基-1,2,3-三唑类衍生物(4a~4e). 目标化合物的结构经核磁、IR及元素分析确认. 抑菌活性测试表明, 当质量浓度为0.1 mg/L时, 除化合物3e和4e外, 所有化合物对白色念球菌的抑菌率均达95%以上, 对大肠杆菌的抑菌率达85%以上, 具有强抑菌活性, 表明该类化合物在抗菌药物开发方面有重要应用价值.     

稠杂环化合物的研究(Ⅳ)——5-醛胺基-1-芳基-1,2,3-连三唑[2,3-d]嘧啶-4-酮类衍生物的合成及抗菌性能

我们已报道了1-芳基-4-乙氧羰基-5-氨基-1,2,3-连三唑类衍生物(1)的合成及抗菌活性,为研究药物构效关系,我们利用1的酰肼3同甲酸反应,制得了尚未报道的5-醛胺基-1-芳基-1,2,3-连三唑[2,3-d]嘧啶-4-酮(4_(a-c))及5-氨基-6-羟基-7H-1-(间硝基)苯基-1,2,3-连三唑[2,3-d]嘧啶-4-酮(5_d).并观察了它们对枯草杆菌,金黄色葡萄球菌等繁殖的抑制作用。     

一些新的含连三唑环的Aza-Wittig试剂的合成与表征

报道以取代芳胺为原料经重氮化,叠氮化,1,3-偶极环加成反应得到1-代芳基-4-乙氧羰基-5-胺基-1,2,3-三唑,并以此为原料合成了一些新的Aza-Wittig试剂---1-取代芳基-4-乙氧羰基-5-三苯膦化亚胺基-1,2,3-三唑。     

3-甲基-4-氨基-5-乙氧羰基甲硫基三唑席夫碱的合成及生物活性

以3-甲基-4-氨基-5-巯基-1,2,4-三唑为原料,在乙醇/氢氧化钠体系中与氯乙酸乙酯反应合成了3-甲基-4-氨基-5-乙氧羰基甲硫基-1,2,4-三唑,再与取代芳醛合成了6种(A1～A6)新型乙氧羰基三唑席夫碱化合物,化合物结构经元素分析,IR,1H NMR,MS等确证。对烟草赤星病、马铃薯干腐病、小麦赤霉病、西瓜枯萎病4种植物病原菌的初步生物活性测试结果表明,化合物A3的抑菌活性优于或相当于对照原药三唑酮。     

1-对甲苯基-5-取代苯基亚胺基-1,2,3-三唑甲酸/甲酰胺的合成及生物活性研究

以对甲基苯胺为原料,经过重氮化反应生成对甲基叠氮苯(1).在强碱性条件下,1分别与氰基乙酸乙酯、氰基乙酰胺反应,制得中间体1-对甲苯基-5-氨基-1,2,3-三唑甲酸乙酯(2)和1-对甲苯基-5-氨基-1,2,3-三唑甲酰胺(5);中间体2经水解生成1-对甲苯基-5-氨基-1,2,3-三唑甲酸(3),进而在弱酸性条件下与取代苯甲醛反应得到6个未见文献报道的目标化合物1-对甲苯基-5-取代苯基亚胺基-1,2,3-三唑甲酸(4a～4f),5与取代苯甲醛反应得到6个未见文献报道的目标化合物1-对甲苯基-5-取代苯基亚胺基-1,2,3-三唑甲酰胺(6a～6f),化合物的结构均经IR,1H NMR,13C NMR确证.初步生物测试表明,12个化合物均表现出良好的抑菌活性,其中化合物4d～4f和6d～6f对金黄色葡萄球菌、白色念球菌的最小抑菌浓度(MIC)值为2～8μg/mL,抗菌效果优于氟康唑和三氯生.     

2-芳胺基-5-[5'-氨基-1'-(4"-氯苯基)-1',2',3'-三唑-4'-基]-1,3,4-噻二唑的合成

1-[5'-氨基-1'-(4"-氯苯基)-1,2,3-三唑-4'-甲酰基]-4-芳基-3-氨基硫脲在浓硫酸催化下环化得到2-芳胺基-5-[5'-氨基-1'-(4"-氯苯基)-1',2',3',-三唑-4'-基]-1,3,4-噻二唑2a-i, 依此法合成了九个标题化合物, 收率为30-74%。化合物2i的结构用X-光衍射单晶分析确证。     

2-芳胺基-5-[5′-氨基-1′-(4″-氯苯基)-1′,2′,3′-三唑-4′-基]-1,3,4-噻二唑的合成~≠

1-[5’-氨基-1’-(4”-氯苯基)-1,2,3-三唑-4’-甲酰基]-4-芳基-3-氨基硫脲在浓硫酸催化下环化得到2-芳胺基-5-[5’-氨基-1’-(4”-氯苯基)-1’,2’,3’,-三唑-4’-基]-1,3,4-噻二唑2a～i,依次法合成了九个标题化合物,收率为30～74％。化合物2i的结构用X-光衍射单晶分析确证。     

噻唑啉-2-硫酮衍生物的合成与生物活性

根据活性亚结构拼接原理,将3-芳基-4-氨基-5-乙氧羰基(氰基)-3H-噻唑啉-2-硫酮与酰氯反应得到目标化合物3-芳基-4-取代苯氧乙酰氨基-5-乙氧羰基(氰基)-3H-噻唑啉-2-硫酮.再以3-苯基-4-氨基-5-乙氧羰基-3H-噻唑啉-2-硫酮为合成原料,经过Aza-Wittig反应得到目标化合物5-芳氧基-3,6-二芳基-2-硫代噻唑并[4,5-d]嘧啶-7-酮.通过IR,1H NMR,EI-MS,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5-对氯苯氧基-3,6-二苯基-2-硫代-2,3-二氢噻唑并[4,5-d]嘧啶-7(6H)-酮(C1)经单晶X衍射证实了结构.除草活性测试结果表明:部分噻唑啉-2-酮类衍生物对稗草和油菜都表现出了较好的抑制活性.     

A new and Facile Method for Synthesis of AZA-Wittig Reagents under Microwave Irradiation

We report a simple and quick synthetic method of some new Aza-Wittig reagents in anhydrous acetonitrile under microwave irradiation. 1-Substituted aryl-4-ethoxycarbonyl-5-[(triphenylphosphoranylidene)amino]-1, 2, 3-triazoles can be obtained within three minutes by microwave irradiation to the mixture of 1-substituted aryl-4-ethoxycarbonyl-5-amino-1,2,3-triazoles, triphenylphosphine, hexachloroethane and triethylamine. The products were characteried by IR, NMR, MS methods and elemental analysis.     

Synthesis of isomerically pure 3-(5-trifluoromethyl-1,2,3-triazol-4-yl)cinnamic acid derivatives via the reaction of 4-aryl-6-trifluoromethyl-2-pyrones with sodium azide

Treatment of 4-aryl-6-trifluoromethyl-2-pyrones with sodium azide in DMSO afforded the corresponding (Z)-3-(5-trifluoromethyl-1,2,3-triazol-4-yl)cinnamic acids in good yields. Similarly, 4-aryl-3-carbethoxy-6-trifluoromethyl-2-pyrones smoothly reacted with sodium azide in acetonitrile to produce (E)-2-ethoxycarbonyl-3-(5-trifluoromethyl-1,2,3-triazol-4-yl)cinnamic acids in high yields, whereas their reactions in ethanol, accompanied by a configurational change, gave the thermodynamically more stable (Z)-2-ethoxycarbonyl-3-(5-trifluoromethyl-1,2,3-triazol-4-yl)cinnamic acids.     

Phosphorus pentachloride-induced transformation of (1,2,3-thiadiazol-5-yl)hydrazones of acetophenone

Russian Chemical Bulletin - Reactions of (4-ethoxycarbonyl-1,2,3-thiadiazol-5-yl)hydrazones of acetophenone with PCl5 led to transformation of the 1,2,3-thiadiazole moiety involving four atoms of...     

新型1,2,3-三唑类化合物的合成及抗菌构效关系

根据活性基团拼接原理, 以4-取代-苯胺为原料, 经重氮化、 关环和缩合反应合成了17个化合物1-(4-取代苯基)-5-取代苯基亚氨基-4-取代-1,2,3-三唑(7a~7c和13a~13d)和1-(4-取代苯基)-5-取代苄基氨基-4-取代-1,2,3-三唑(5a~5c, 10a~10c和14a~14d), 其中化合物5a~5c, 7b, 7c, 10a, 10c, 13b~13d和14b~14c为新化合物, 对所制备化合物的结构进行了表征. 生物活性测试结果表明, 所有化合物均表现出一定的抑菌活性, 对大肠杆菌的抑菌活性均优于氟康唑; 化合物7a和10c对金黄色葡萄球菌的抑制活性明显优于氟康唑; 而化合物13a和13d则对白色念球菌表现出良好的抑制活性, 与三氯生相当.     

Reaction of 1,2,3-Selenadiazoles with Phosphines

Nucleophilic attack of tributyl- and triphenylphosphines on 4-phenyl- and 5-ethoxycarbonyl-4-methyl-1,2,3-selenadiazoles leads to the quantitative formation of selenophosphoranes and substituted acetylenes. The molecular structure of 4-phenyl-1,2,3-selenadiazole was confirmed by X-ray crystallography.     

Condensation of 4-Substituted 2-Ethoxycarbonyl-4-pentanolides with α,β-Unsaturated Compounds

Condensation of 4-substituted 2-ethoxycarbonyl-4-pentanolides with methyl acrylate and acrylonitrile under Michael reaction conditions in the presence of sodium methylate affords 4-substituted 2-ethoxycarbonyl-2-(2-methoxycarbonyl- or cyano)ethyl-4-pentanolides. The latter were subjected to alkaline hydrolysis, and 4-substituted 2-carboxy-2-(2-carboxyethyl)-4-pentanolides were isolated which on decarboxylation yielded 4-substituted 2-(2-carboxyethyl)-4-pentanolides. The partial hydrolysis of 2-ethoxycarbonyl-2-(2-cyanoethyl)-4-pentanolides gave rise to previously unknown cyanolactones.     

Thiadiazole ring opening in the derivatives of 2-substituted 5-(1,2,3-thiadiazol-4-yl)-3-furoic acid under the action of bases

Transformations of the derivatives of 2-substituted 5-(1,2,3-thiadiazol-4-yl)-3-furoic acid under the action of bases has been studied. In the presence of potassium tert-butylate in THF, the studied compounds decompose with the cleavage of the thiadiazole ring, liberation of nitrogen, and formation of labile acetylene thiolates. In the presence of methyl iodide, these salts form stable 2-methylthioethynylfurans. Under the action of sodium ethylate in ethanol, thiadiazole ring of ethyl [2-methyl-5-(1,2,3-thiadiazol-4-yl)]-3-furoate is split to form the corresponding sodium acetylene thiolate. Under the action of ethanol, two molecules of this salt give bis(furyl)dithiafulvene. In the DMF–potassium carbonate system, acetylene thiolates react with primary and secondary amines giving thioamides of (4-ethoxycarbonyl-5-methylfur-2-yl)acetic acid. Treating of ethyl 2-methyland 2-N-morpholinomethyl-5-(1,2,3-thiadiazol-4-yl)-3-furoates with hydrazine hydrate leads to hydrazinolysis of the ester group and cleavage of thiadiazole ring resulting in the formation of hydrazides of 4-hydrazinocarbonylfur-2-ylacetic acid. In the case of ethyl 2-acetoxymethyl- and 2-(4-nitrophenoxy)methyl-5-(1,2,3-thiadiazol-4-yl)-3-furoates, thiadiazole ring is retained and exclusively hydrazinolysis of the ester groups is observed.     

Synthesis of 2-alkyl- and aryl-3-ethoxycarbonyl-2,5-dihydrofurans through gold-catalyzed intramolecular hydroalkoxylation

Treatment of a wide range of functionalized hydroxyallenic esters with 5 mol % Ph(3)PAuCl and 5 mol % AgOTf in CH(2)Cl(2) at 25 °C for 1 h produced selectively 2-alkyl- and aryl-3-ethoxycarbonyl-2,5-dihydrofurans in good to excellent yield through intramolecular hydroalkoxylation by a 5-endo mode.     

Heterocyclization of compounds containing diazo and cyano groups. 2. Synthesis and recyclization of 4-substituted 5-amino-1,2,3-thiadiazoles

The reaction of carbonyl derivatives of diazoacetonitrile with hydrogen sulfide in the presence of triethylamine yields 4-substituted 5-amino-1,2,3-triadiazoles. Under analogous conditions, hydrogen selenide and ethyl mercaptan reduce the starting diazo compounds to hydrazones. Thiadiazoles are recyclized to 4-substituted 5-mercapto-1,2,3-triazoles by the action of bases.For 1, see [1].Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 691–696, May, 1986.