Synthesis and antimicrobial activity of some derivatives of (7-hydroxy-2-oxo-2H-chromen-4-yl)-acetic acid hydrazide

(7-Hydroxy-2-oxo-2H-chromen-4-yl)-acetic acid hydrazide (2) was prepared from (7-hydroxy-2-oxo-2H-chromen-4-yl)-acetic acid ethyl ester (1) and 100% hydrazine hydrate. Compound 2, is the key intermediate for the synthesis of several series of new compounds such as Schiff's bases 3a-l, formic acid N'-[2-(7-hydroxy-2-oxo-2H- chromen-4-yl)acetyl] hydrazide (4), acetic acid N'-[2-(7-hydroxy-2-oxo-2H-chromen-4- yl)-acetyl] hydrazide (5), (7-hydroxy-2-oxo-2H-chromen-4-yl)-acetic acid N'-[2-(4- hydroxy-2-oxo-2H-chromen-3-yl)-2-oxoethyl] hydrazide (6), 4-phenyl-1-(7-hydroxy-2- oxo-2H-chromen- 4-acetyl) thiosemicarbazide (7), ethyl 3-{2-[2-(7-hydroxy-2-oxo-2H- chromen-4-yl)-acetyl]hydrazono}butanoate (8), (7-hydroxy-2-oxo-2H-chromen-4-yl)- acetic acid N'-[(4-trifluoromethylphenylimino)methyl] hydrazide (9) and (7-hydroxy-2- oxo-2H-chromen-4-yl)acetic acid N'-[(2,3,4-trifluorophenylimino)-methyl] hydrazide (10). Cyclo- condensation of compound 2 with pentane-2,4-dione gave 4-[2-(3,5- dimethyl-1H-pyrazol-1-yl)-2-oxoethyl]-7-hydroxy-2H-chromen-2-one (11), while with carbon disulfide it afforded 7-hydroxy-4-[(5-mercapto-1,3,4-oxadiazol-2-yl)methyl]-2H- chromen-2-one (12) and with potassium isothiocyanate it gave 7-hydroxy-4-[(5- mercapto-4H-1,2,4-triazol-3-yl)methyl]-2H-chromen-2-one (14). Compound 7 was cyclized to afford 2-(7-hydroxy-2-oxo-2H-chromen-4-yl)-N -(4-oxo-2-phenylimino- thiazolidin-3-yl) acetamide (15).     

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.     

(Z)-3,3-二甲基-1-(1H-1,2,4-三唑-1-基)-2-丁酮肟(5-芳基-1,3,4-噁二唑-2-基)甲基醚的合成和抑菌活性

以3,3-二甲基-1-（1H-1,2,4-三唑基）-2-丁酮肟为原料,经醚化、肼解及腙化3步反应得到（E）-N'-（取代苯亚甲基）-2-[（Z）-3,3-二甲基-1-（1H-1,2,4-三唑-1-基）丁基-2-亚甲氨氧基]乙酰肼（3a~3u）,化合物3与二乙酸碘苯（IBD）反应,合成了21个（Z）-3,3-二甲基-1-（1H-1,2,4-三唑-1-基）-2-丁酮肟-（5-芳基-1,3,4-噁二唑-2-基）甲基醚（4a~4u）,化合物4的化学结构经核磁共振谱、高分辨质谱和元素分析确证.采用单晶X射线衍射仪测定了化合物4c的晶体结构.抑菌活性测试结果表明,在500 mg/L浓度下,化合物4k,4f,4j和4n对纹枯病菌的防效率分别为70.9%,60.2%,60.0%和60.6%;在25 mg/L浓度下,化合物4b,4c,4d和4e对菌核病菌的抑制率为71.8%~76.9%.     

Synthesis of 3-(3-Alkyl-5-thioxo-1H-4,5-dihydro-1,2,4-triazol-4-yl)aminocarbonylchromones

A series of 3-(3-alkyl-5-thioxo-1H-4,5-dihydro-1,2,4-triazol-4-yl)aminocarbonylchromones has been prepared by oxidation of 3-formylchromone with Jones' reagent followed by reaction with 3-alkyl-4-amino-4,5-dihydro-1,2,4-triazole-5(1H)-thione in the presence of POCl³. The structures of the compounds were confirmed by IR, LC-MS, and ¹H NMR spectra and elemental analyses.     

Synthesis and Anti-Inflammatory Properties of Substituted 5-(Tetrahydro-4-phenyl-2H-pyran-4-yl)-4H-1,2,4-triazole-3-thiols

Russian Journal of Organic Chemistry - 5-(Tetrahydro-4-phenyl-2H-pyran-4-yl)-4H-1,2,4-triazole-3-thiol was synthesized by the reaction of 4-phenyltetrahydropyran-4-carbonyl chloride with...     

Syntheses of 4-(benzo[b]furan-2 or 3-yl)- and 4-(benzo[b]-thiophen-3-yl)piperidines with 5-HT2 antagonist activity

The syntheses of 4-(benzo[b]furan-3-yl)piperidines, 4-(benzo[b]furan-2-yl)piperidines and 4-(benzo[b]thiophen-3-yl)piperidines with 5-HT₂ antagonist activity are described. Reaction of 1-acetyl-4-(2,4-difluorobenzo-yl)piperidine 2 with methyl glycolate gave methyl 6-fluoro-3-(1-acetylpiperidin-4-yl)benzo[b]furan-2-carboxylate 3 , which was converted to 2-[2-[4-(benzo[b]furan-3-yi)piperidin-1-yl]ethyl-5,6,7,8-tetrahydro-1,2,4-triazolo-[4,3-a]pyridin-3(2H)-one hydrochloride 9 . Analogous benzo[b]furans 17a-d and benzo[b]thiophenes 10a,b and 18a were prepared by a similar method. Cyclization of 4-fluoro-2-(4-pyridinylmethoxy)acetophenones 20a,b afforded 4-(benzo[b]furan-2-yl)pyridines 21a,b , which were converted to 2-[2-[4-(benzo[b]furan-2-yl)-piperidin-1-yl]ethyl-5,6,7,8-tetrahydro-1,2,4-triazolo[4,3-a]pyridin-3(2H)-one hydrochlorides 24a,b. Among them, benzo[b]furans 9 and 17a,d and benzo[b]thiophenes 10 and 18a showed potent 5-HT₂ antagonist activity in vitro.     

Synthesis of N-Substituted Derivatives of 3-(1,4-Benzodioxan-2-yl)-4-phenyl-1,2,4-triazole-5(4H)-thiones

Russian Journal of Organic Chemistry - The addition of 5-(1,4-benzodioxan-2-yl)-4-phenyl-4H-1,2,4-triazole-3-thiol to the C=C double bond of acrylonitrile, acrylamide, and ethyl acrylate afforded...     

Synthesis and Crystal Structure of N''-(4-fluorobenzylidene)-2-(1H-1,2,4-triazole-1-yl) acetohydrazide

N'-(4-fluorobenzylidene)-2-(1H-1,2,4-triazole-1-yl)acetohydrazide was synthesized by the reaction of 4-fluorobenzaldehyde with 2-(1H-1,2,4-triazole-1-yl) acetohydrazide. The structure was confirmed via elemental analysis, MS,1H NMR, IR, and X-ray diffraction. It crystallized in a monoclinic system with space group P2 ( 1 ), a =0.4905(1) nm, b=0.8160(2) nm, c=1.4105(3) nm,β=93.33(3)°,Z=2, V=0.5636(2) nm3, Dc =1.457 Mg/m3,μ=0.112 mm-1 , F(000) =256, and final R1 =0. 0685. Several intermolecular hydrogen-bond interactions existed in the crystal structure, facilitating the stabilization of the compound.     

Synthesis of 4-(pyrazol-5-yl)-1,2,4-triazole-3-thiones

Condensation of pyrazolyl isothiocyanates 2 with N-substituted hydrazines provided the 2-methyl/phenyl-4-(pyrazol-5-yl)thiosemicarbazides 3 . Cyclization of 3 with formic acid-acetic anhydride or with triethyl orthoacetate-acetic anhydride provided 4-(pyrazol-5-yl)-l,2,4-triazole-3-thiones 4a-f and 5-methyl-4-(pyrazol-5-yl)-1,2,4-triazole-3-thiones 4g-I respectively.     

新型S(N)-β-D-葡萄糖苷-4-N-(取代邻羟苯基)亚胺基-5-(4-甲基-1,2,3-噻二唑)-1,2,4-三唑的合成及生物活性

在KOH/acetone体系中,4-N-(取代邻羟苯基)亚胺基-5-(4-甲基-1,2,3-噻二唑)-1,2,4-三唑-3-硫酮(3a～3d)与溴-α-D-四乙酰葡萄糖发生Kenigs-Knorr反应,合成了8个未见报道的S(N)-β-D-乙酰葡萄糖苷,其结构经1H NMR、13C NMR、红外光谱及元素分析等确定.目标化合物的生物活性测试结果表明,它们对金黄色葡萄球菌、白色念珠菌和大肠杆菌均显示了较好的抑菌活性,其效果接近或优于对照药物三氯生和氟康唑的抑菌效能.其中,化合物2-N-(2’,3’,4’,6’-O-四乙酰基-β-D-吡喃葡萄糖基)-4-N-(3,5-二溴邻羟苯基)亚胺基-5-(4-甲基-1,2,3-噻二唑)-1,2,4-三唑-3-硫酮(4d)及3-S-(2’,3’,4’,6’-O-四乙酰基-β-D-吡喃葡萄糖硫基)-4-N-(3,5-二溴邻羟苯基)亚胺基-5-(4-甲基-1,2,3-噻二唑)-1,2,4-三唑(5d)具有较强的抑菌活性.     

4-(2-Methoxyphenyl)-5-(thiophen-2-ylmethyl)-2,4-Dihydro-1H-1,2,4-Triazole-3-Thione and Its Complex with Cadmium Chloride: Molecular and Crystal Structures

Russian Journal of Coordination Chemistry - Compound 4-(2-methoxyphenyl)-5-(thiophen-2-ylmethyl)-2,4-dihydro-1H-1,2,4-triazole-3-thione (LН) and its complex with cadmium(II)...     

Synthesis of Geminally Activated 4-(Furan-2-yl)- and 4-(Thiophen-2-yl)-1-nitrobuta-1,3-dienes

The condensation of 3-(furan-2-yl)- and 3-(thiophen-2-yl)prop-2-enals with nitro-substituted CH acids, namely ethyl nitroacetate, nitroacetone, nitroacetophenone, and nitroacetonitrile, afforded a series of geminally activated nitro dienes, 4-(furan-2-yl)- and 4-(thiophen-2-yl)-1-nitrobuta-1,3-dienes. The product structure was confirmed by NMR and IR spectroscopy.

     

Synthesis of azoles from 3-[(3-hydrazino-3-oxopropyl)anilino]-and 3-[(3-hydrazino-3-oxopropyl)-4-methylanilino]propane hydrazides

Condensation of 3-[(3-hydrazino-3-oxopropyl)anilino]-and 3-[(3-hydrazino-3-oxopropyl)-4-methylanilino]propane hydrazides with 2,4-pentanedione, phenyl isocyanate or phenyl isothiocyanate (with subsequent work up of the semicarbazides obtained by base), and carbon disulfide gave respectively: 1-(3,5-dimethyl-1H-1-pyrazolyl)-3-[3-(3,5-dimethyl-1H-1-pyrazolyl)-3-oxopropylanilino]-1-propanone, 3-(2-{[2-(5-oxo-4-phenyl-4,5-dihydro-1H-1,2,4-triazol-3-yl)ethyl]anilino}ethyl)-4-phenyl-4,5-dihydro-1H-1,2,4-triazol-5-one and its thio analog, and 5-(2-{[2-(2-thioxo-2,3-dihydro-1,3,4-oxadiazol-5-yl)ethyl]anilino}ethyl)-2,3-dihydro-1,3,4-oxadiazole-2(3H)-thione plus their methyl derivatives. __________ Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 9, pp. 1353–1358, September, 2007.     

Novel one-pot multicomponent synthesis of (E)-2-(benzylideneamino)-5-mercapto-4H-1,2,4-triazol-3-yl)-2,3-dihydrophthalazine-1,4-dione derivatives

Abstract

An expeditious, one-pot multicomponent reaction has been developed for the synthesis of (E)-2-(benzylideneamino)-5-mercapto-4H-1,2,4-triazol-3-yl)-2,3-dihydrophthalazine-1,4-dione derivatives. Condensation of 4-amino-5-hydrazino-4H-1,2,4-triazole-3-thiol with phthalic anhydride and aromatic aldehyde afforded the (E)-2-(benzylideneamino)-5-mercapto-4H-1,2,4-triazol-3-yl)-2,3-dihydrophthalazine-1,4-diones in acetic acid medium with excellent yields. All the synthesized compounds were characterized by their analytical and spectral data.     

Synthesis and molecular structure of 3-[5-(quinolin-2-yl)penta-1,4-dien-1-yl]-1,4-benzodioxin-2-one

Acid-catalyzed reaction of 6,10a-dihydroxy-3,4a,7,9-tetra(tert-butyl)-1,2,4a,10a-tetrahydrodibenzo-[b,e][1,4]dioxine-1,2-dione with 4-chloro-2,7,8-trimethylquinoline gave previously unknown 3,6,8-tri-tert-butyl-3-[2-tert-butyl-5-(4-chloro-7,8-dimethylquinolin-2-yl)-4-hydroxy-3-oxopenta-1,4-dien-1-yl]-5-hydroxy-1,4-benzodioxin-2-one whose structure was determined by X-ray analysis. The energy and structure parameters of possible isomers of the product in the gas phase and in solution were estimated by PBE0/6-31G** quantum-chemical calculations.     

Cu(II), Ni(II) and Fe(II) complexes with a new substituted [1,2,4] triazole Schiff base derived from 4-amino-5-(thien-2-yl ethyl)-2,4-dihydro-3H-1,2,4-triazol-3-one and 2-hydroxy-1-naphthaldehyde: synthesis,characterization and a comparison of theoretical and experimental results by Ab inito calculation

The synthesis and structural properties of two novel compounds, 4-amino-5-(thien-2-yl ethyl)-2,4-dihydro-3H-1,2,4-triazol-3-one and 4-{[(2-hydroxy-1-naphthyl)methyl-ene]amino}-5-(thien-2-ylmethyl) − 2,4-dihydro-3H-1,2,4-triazol-3-one have been described. 4-Amino-5-(thien-2-ylmethyl)-2,4-dihydro-3H-1,2,4-triazol-3-one was synthesized by treating N-propionyl-2-thien-2-ylethane-hydrazonoate with hydrazine hydrate and the Schiff base was obtained from condensation of substituted amine with 2-hydroxy-1-naphthaldehyde. The Cu(II), Ni(II) and Fe(II) complexes were prepared and characterized by elemental analyses, IR, magnetic moment, UV–Vis, mass spectral data and ¹H- and ¹³C-NMR IR spectra. The Schiff base is coordinated to the metal ions in a tridentate manner with OON donors of the phenolic O, carbonyl O and triazolic N. From the magnetic and UV spectral data, it was found the geometrical structure of Cu(II) and Fe(II) ions are octahedral while Ni(II) ion is square planar.Ab-inito 6-31 G* level calculations provided structural information and IR data that were in good agreement with experimental results.     

The use of umbelliferone in the synthesis of new heterocyclic compounds

New coumarin derivatives, namely 7-[(5-amino-1,3,4-thiadiazol-2-yl)methoxy]-2H-chromen-2-one, 5-[(2-oxo-2H-chromen-7-yloxy)methyl]-1,3,4-thiadiazol-2(3H)-one, 2-[2-(2-oxo-2H-chromen-7-yloxy)acetyl]-N-phenylhydrazinecarbothioamide, 7-[(5-(phenylamino)-1,3,4-thiadiazol-2-yl)methoxy]-2H-chromen-2-one and 7-[(5-mercapto-4-phenyl-4H-1,2,4-triazol-3-yl)methoxy]-2H-chromen-2-one were prepared starting from the natural compound umbelliferone. The newly synthesized compounds were characterized by elemental analysis and spectral studies (IR, 1H-NMR and 13C-NMR).     

3-芳基-1-(吡啶-3-基)-2-(1H-1,2,4-三唑-1-基)-2-丙烯-1-醇的合成及生物活性研究

用硼氢化钠还原3-芳基-1-(吡啶-3-基)-2-(1H-1,2,4-三唑-1-基)丙烯酮, 合成了10个新型含吡啶基的三唑醇类化合物. 所有化合物均经核磁、元素分析确证. 生物活性测试结果表明, 部分化合物具有一定的杀菌活性及植物生长调节活性.     

Synthesis and Crystal Structure of 5-[（1H-1,2,4-Triazol-1- yl）methyl]-4-（2,3-dimethoxybenzylideneamino）-2- 2H-1,2,4-triazole-3（4H）-thione Monohydrate

1 INTRODUCTION Heterocyclic compounds bearing the 1,2,4-tri- azole moiety have attracted considerable attention over the past few decades since they exhibit some fungicidal activities against Puccinia recondite and applications in the field of root-growth regu- lation[1~3]. Meanwhile, 4-amino-5-mercapto-1,2, 4-triazole moiety has great versatility in fusing tovarious ring systems and possesses a broad spec- trum of biological activities[4, 5]. In our con- tinuous work directed towards the…     

2-(1H-1,2,4-三唑-1-基)-4,4-二甲基-1-烃硫基-3-戊酮的合成及波谱性质

由 2 - (1H - 1 ,2 ,4-三唑 - 1 -基 ) - 4 ,4-二甲基 - 1 -戊烯 - 3 -酮和硫酚 (醇 )亲核加成反应合成了五个未见文献报道的目标化合物 ,其化学结构经IR、1 HNMR、MS和元素分析确证并研究其波谱性质