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1.
Russian Journal of Organic Chemistry - The title compounds,... 相似文献
2.
The cyclization of 1‐amino‐2‐mercapto‐5‐[5‐methyl‐1‐(4‐methylphenyl)‐1,2,3‐triazol‐4‐yl]‐1,3,4‐triazole with various α‐haloketone in absolute ethanol yields 7H‐3‐[5‐methyl‐1‐(4‐methylphenyl)‐1,2,3‐triazol‐4‐yl]‐6‐substituted‐s‐triazolo[3,4‐b]‐1,3,4‐thiadiazines and their structures are established by elemental analysis, MS, IR and 1H NMR spectral data. 相似文献
3.
Synthesis of Imidazo[2,1‐b][2H‐1,3,4]thiadiazines and 1,2,4‐Triazolo[3,4‐b][2H‐1,3,4]thiadiazines 下载免费PDF全文
Stefanie Knak Wolf‐Diethard Pfeiffer Horst Dollinger Ashot S. Saghyan Peter Langer 《Journal of heterocyclic chemistry》2015,52(2):463-467
Imidazo[2,1‐b][2H‐1,3,4]thiadiazines were prepared by cyclization of 2‐amino‐5‐(4‐chlorophenyl)‐6H‐1,3,4‐thiadiazine with α‐haloketones. 1,2,4‐Triazolo[3,4‐b][2H‐1,3,4]thiadiazines were prepared by cyclization of 4‐amino‐5‐sulfanyl‐l,2,4‐triazoles with phenacyl bromides. 相似文献
4.
A novel series of 1-(1-carbonylmethyl-1H-benzotriazole) thiosemicarbazides 3a-e was synthesized and then cyclized with sodium hydroxide to afford 1-(4-substituted-4H-1,2,4-triazole-3-thion-5-yl)methyl-1H-benzotriazoles 4a-e , which were alkylated with ethyl iodide to l-(3-ethylthio-4-substituted-4H-1,2,4-triazol-5-yl)-methyl-1H-benzotriazoles 5b-e . The reaction of 1H-benzotriazol-1-acetic acid hydrazide ( 2 ) with carbon disulphide and potassium hydroxide followed by hydrazine hydrate gave 1-(4-amino-4H-1,2,4-triazole-3-thion-5-yl)methyl-1H-benzotriazole ( 6 ). Its subsequent condensation with carboxylic acids in the presence of phosphorus oxychloride or with phenacyl bromides afforded two series of fused heterocycles namely; 6-substituted-3-[1-(1H-benzotriazole)methyl]-1,2,4-triazolo[3,4-b][1,3,4]thiadiazoles 7a-e and 6-substituted phenyl-3-[1-(1H-benzotriazole)methyl]-7H-1,2,4-triazolo[3,4-b][1,3,4]thiadiazines 8a-e respectively. The structure of the newly synthesized compounds was elucidated by elemental analyses, ir and nmr spectra. 相似文献
5.
Radineh Motamedi Majid M. Heravi Fatemeh F. Bamoharram Anahita Haeri 《Journal of heterocyclic chemistry》2008,45(4):1211-1214
Cyclization of 4‐amino‐6‐methyl‐3‐propargylmercapto‐1,2,4‐triazine‐5‐one 3 and 4‐amino‐3‐propargyl mercapto‐1,2,4‐triazole derivatives 6 were afforded 1,2,4‐triazino[3,4‐b][1,3,4]thiadiazines 4 and 1,2,4‐triazolo[3,4‐b][1,3,4]thiadiazines 7 in presence of heteropolyacids, H14[NaP5W29MoO110] and H6P2W18O60 in high yields. Among used heteropoly acids, the yields were higher with H14‐P5Mo, caused to their high acid strengths. 相似文献
6.
Dhotre B. K. Raut S. V. Jagrut V. B. Patharia M. A. Pathan M. A. 《Russian Journal of Organic Chemistry》2021,57(7):1135-1140
Russian Journal of Organic Chemistry - An efficient synthesis of fluorinated [1,2,4]triazolo[3,4-b][1,3,4]thiadiazole derivatives has been achieved by cyclocondensation of 5-substituted... 相似文献
7.
A Facile Synthesis of Aryl‐Substituted Hydrazono‐Pyrazolyl[1,2,4]triazolo[3,4‐b][1,3,4][thiadiazol]‐coumarin Derivatives 下载免费PDF全文
Some inimitable and therapeutic coumarin‐substituted fused[1,2,4]triazolo‐[3,4‐b][1,3,4]thiadizole derivatives were synthesized by the cyclocondensation reaction of 2‐oxo‐2H‐chromene‐3‐carboxylic acid ( 1 ) and 4‐amino‐5‐hydrazinyl‐4H‐[1,2,4]‐triazole‐3‐thiol ( 2 ) by using phosphorous oxychloride as a cyclizing agent. This cyclized intermediate 3‐(3‐hydrazino‐[1,2,4]triazolo[3,4‐b][1,3,4]thiadiazol‐6‐yl)‐chromen‐2‐one ( 3 ) later condensation with various ethyl 2‐(2‐arylhydrazono)‐3‐oxobutanoates ( 4 ) in NaOAc/MeOH under reflux conditions afforded the corresponding new series of aryl‐substituted hydrazono‐pyrazolyl‐[1,2,4]triazolo[3,4‐b][1,3,4][thiadiazol]‐coumarin derivatives ( 5 ) in good to excellent yields. The structures of newly synthesized compounds were established on the basis of elemental analysis, IR, 1H NMR and mass spectroscopic studies. 相似文献
8.
Two regioselective synthetic approaches for the title compounds 7 via reaction of hydrazonoyl halides 1 with 3‐methylthio‐5‐phenyl‐1,2,4‐triazole 3 and base‐catalyzed cyclization of N‐phenyl‐N‐(5‐phenyl‐s‐triazol‐3‐yl)thiohydrazides 6 are described. The mechanisms of the reactions studied and the biological activity of the isolated products 6 and 7 are pointed out. 相似文献
9.
Ahmad S. Shawali Ibrahim F. Zeid Mahmoud H. Abdelkader Alsayed A. Elsherbini Farag M. A. Altalbawy 《中国化学会会志》2001,48(1):65-72
7‐Arylhydrazono[1,2,4]triazolo[3,4‐b][1,3,4]thiadiazines 4 were synthesized from the reactions of 4‐amino‐5‐phenyl‐4H‐[1,2,4]triazole‐3‐thiol 2 and 2‐(2‐naphthyl)‐2‐oxoethanehydrazonoyl bromides 1 and their acid dissociation constants pK and pK*, in the ground and excited states, respectively, were determined. Both pK and pK* constants were correlated by Hammett equation. The pK and the spectral data presented indicate that the title compounds exist predominantly in the hydrazone tautomeric form. 相似文献
10.
《Journal of heterocyclic chemistry》2017,54(1):235-241
Several new pyrimido[4,5‐e ][1,2,4]triazolo[3,4‐b ][1,3,4]thiadiazine derivatives ( 5a , 5b , 5c , 5d , 5e , 5f , 5g ) were synthesized through the condensation reaction of 5‐bromo‐4,6‐dichloropyrimidine ( 1 ) and 4‐amino‐5‐methyl‐4H‐1,2,4‐triazole‐3‐thiol ( 2 ). The single crystal X‐ray data of one of the derivatives confirmed the occurrence of the S/N type Smiles rearrangement during the course of the reaction. 相似文献
11.
《Journal of heterocyclic chemistry》2017,54(4):2360-2366
Condensation of 2‐amino‐5‐phenyl‐5H‐thiazolo[4,3‐b] [1,3,4] thiadiazoles ( 1 ) with some carboxylic acid derivatives furnished corresponding compounds 2–4 , respectively. Alkylation of 1 with benzoylchloride and 4‐chlorobenzyl chloride afforded thiazolo[4,3‐b][1,3,4]thiadiazole derivatives 5 and 6 , respectively. Similarly, transformation of 1 with chloroacetyl chloride yielded chloroacetamide derivative 7 . The later compound was subjected to react with potassium thiocyanate or piperazine whereby, the binary thiazolidinone derivative 8 and N 1 ,N4‐disubstituted piperazine 9 were produced, respectively. Also, the reactivity of 1 toward various active methylene reagents was investigated. Accordingly, our attempts to synthesize the tricyclic heterocyclic system 10 , 11′ , 12 ′ by reaction of 1 with chloroacetonitrile, 4‐oxo‐4‐phenylbutanoic acid and/or diethylmalonate in presence of acetyl chloride was furnished 10 , 11 , and 12 . The newly synthesized compounds were screened as antimicrobial agent. 相似文献
12.
A Facile Synthesis of Novel Dihydroindeno[1,2‐e][1,2,4]triazolo[3,4‐b][1,3,4]thiadiazines Using HTIB
Om Prakash Deepak Kumar Aneja Deepak Wadhwa Ravi Kumar Sanjiv Arora 《Journal of heterocyclic chemistry》2012,49(3):566-570
The synthesis of a series of 21 novel 3‐alkyl/aryl‐7/9‐methyl‐10,10a‐dihydroindeno[1,2‐e][1,2,4]triazolo[3,4‐b][1,3,4]thiadiazines ( 4 ) has been achieved by the cyclocondensation between 4/6‐methyl‐2‐tosyloxy‐1‐indanones ( 2 ) and 3‐alkyl/aryl‐4‐amino‐5‐mercapto‐1,2,4‐s‐triazoles ( 3 ). 4/6‐Methyl‐2‐tosyloxy‐1‐indanones ( 2 ) were readily accessible through hypervalent iodine oxidation of 4/6‐methyl‐1‐indanones using [(hydroxy)tosyloxyiodo]benzene (HTIB, Koser's reagent) in acetonitrile. 相似文献
13.
The cyclization of 1‐amino‐2‐mercapto‐5‐[1‐(4‐ethoxyphenyl)‐5‐methyl‐1,2,3‐triazol‐4‐yl]‐1,3,4‐triazole which was synthesized from p‐ethoxyaniline with various triazole acid in absolute phosphorus oxychloride yields 3,6‐bis(1,2,3‐triazolyl)‐s‐triazolo[3,4‐b]‐1,3,4‐thiadiazole derivatives 9a?j , and their structures are established by MS, IR, CHN and 1H NMR spectral data. 相似文献
14.
The condensation of 4‐amino‐5‐mercapto‐3‐(5‐methylisoxazol‐3‐yl)‐1,2,4‐triazole with substituted phenacyl bromide, aldehydes, p‐bromophenylisothiocyanate, aromatic carboxylic acids and oxalic acid, is described. The antibacterial activity of representative compounds was evaluated. 相似文献
15.
Mosselhi A. N. Mosselhi Magda A. Abdallah Yassin F. Mohamed Ahmad S. Shawali 《Phosphorus, sulfur, and silicon and the related elements》2013,188(2):487-496
Two synthetic approaches were developed for the title compounds 8a-g via coupling of diazotized anilines with 7-acetyl-6-methyl-3-phenyl-7H-[1,2,4]triazolo[3,4-b][1,3,4]thiadiazine 7 , and reaction of N-aryl 2-oxopropanehydrazonoyl chlorides 9 with 4-amino-3-mercapto-5-phenyl-1,2,4-triazole 1 . The tautomeric structures of 8 were elucidated by their spectral analyses and correlation of their acid dissociation constants with Hammett equation. 相似文献
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17.
New CuII and CdII Metal‐organic Coordination Polymers with 1,2,4‐triazolo[3,4‐b]‐1,3,4‐thiadiazole Ligands: Syntheses,Structures and Luminescent Properties 下载免费PDF全文
Three new complexes {[Cu( L1 )2(NO3)2]?H2O}oo ( 1 ), {[Cu4( L2 )2(OAc)8]‐CH3CH2OH}oo ( 2 ) and [Cd2( L3 )3(NO3)4(H2O)2]oo ( 3 ) ( L1= 4‐phenyl‐7‐(pyridine‐3‐yl)‐1,2,4‐triazolo[3,4‐b]‐1,3,4‐thiadiazole, L2= 4‐(pyridine‐3‐yl)‐7‐phenyl‐1,2,4‐triazolo[3,4‐b]‐1,3,4‐thiadiazole, and L3= 4‐(pyridine‐4‐yl)‐7‐phenyl‐1,2,4‐triazolo[3,4‐b]‐1,3,4‐thiadiazole) have been synthesized and characterized by elemental analyses, IR spectra and single crystal X‐ray diffraction. The structural analyses reveal that complex 1 is a neutral 2‐D network structure with a 44 topology, 2 has a 1‐D neutral coordination chain with a [Cu2(CH3COO)4] dinuclear structural unit bridged by four acetate ions, and 3 is a neutral rhombohedral grid structure. All the complexes are air stable at room temperature. Furthermore, the fluorescent properties of complex 3 and corresponding ligand L3 have been investigated and discussed. 相似文献
18.
Radineh Motamedi Aazam Monfared Zohre Ghahghai Nezamabadi Fatemeh F. Bamoharram 《Journal of heterocyclic chemistry》2011,48(3):604-607
[1,2,4]Triazolo[3,4‐b][1,3,4]thiadiazines 2a , 2b , 2c , 2d , 2e , 2f and 3,7‐dimethyl‐4H‐[1,2,4]triazino[3,4‐b][1,3,4]thiadiazin‐6‐one 4 were synthesized by one‐pot cyclocondensation reaction with α‐chloroacetonitrile and α‐haloketones in the presence of catalytic amounts of heteropolyacids in very high yields and rates. J. Heterocyclic Chem., (2011). 相似文献
19.
The title compound 3-benzyl-6-trichloromethyl-[1,2,4]triazolo[3,4-b][1,3,4]thiadiazole I (C11HTC13N4S, Mr = 333.62) has been synthesized, and its structure was determined by elemental analyses, IR, ^1H NMR, ^13C NMR, and X-ray diffractions. The crystal is of triclinic, space group P1^-, with a = 5.898(3), b = 10.510(4), c = 11.580(5) A, α = 74.936(7), β= 75.476(7), γ = 79.647(7)°, V= 665.9(5)/A^3, F(000) = 336, Z= 2, Dc = 1.664 g/cm^3, 2 = 0.71073A, p = 0.834 mm^-1, the final R = 0.0605 and wR = 0.0900. The secondary bonding interactions (SBIs) S…N and π-π stacking interactions are found in the crystal structure and they link the molecules into a three-dimensional network. 相似文献
20.
Synthesis and Antifungal Activities of Some New 5,7‐Disubstituted[1,2,4]Triazolo[1,5‐a]Pyrimidin‐6‐one Derivatives 下载免费PDF全文
Susanta Kumar Borthakur Sukanya Borthakur Debarshi Goswami Paran Boruah Pabitra Kumar Kalita 《Journal of heterocyclic chemistry》2016,53(6):2079-2083
Synthesis of a new series of [1,2,4]triazolo[1,5‐a]pyrimidin‐6‐one by [4 + 2]cycloaddition reaction of 3‐benzylidineamino[1,2,4]triazole with monophenyl ketene and diphenyl ketene generated in situ from phenylacetyl chloride and diphenylacetyl chloride in the presence of triethylamine is described. The newly synthesized compounds were also tested for antifungal activities against Rhizoctonia solani and Trichoderma sp. 相似文献