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1.
One-pot synthesis of 2,5-disubstituted-1,3,4-thiadiazoles under ultrasonic irradiation 总被引:1,自引:0,他引:1
Ying Jun Li Ya Zhen Sun Yong Ting Xu Li Ping Wen Ni Bo Hou Xiao Xiao Sun College of Chemistry Chemical Engineering Liaoning Normal University Dalian China Kun Jin State Key Laboratory of Fine Chemicals Dalian University of Technology Dalian China 《中国化学快报》2007,18(9):1047-1048
A facile one-pot synthesis of 2,5-disubstituted-1,3,4-thiadiazoles was achieved by ultrasonic irradiation of a mixture of 1- naphthylacetyl chloride,NH_4CNS,CH_2Cl_2 and PEG-400 for 1.5 h at 10-20℃and subsequent irradiation for 1.5h in the presence of N-arylglycine hydrazides.This method requires short time and gives thiadiazoles in high yields. 相似文献
2.
V. I. Kelarev R. A. Karakhanov G. V. Morozova K. Kapo-Shchishchi A. M. Kuatbekov Yu. N. Polivin 《Chemistry of Heterocyclic Compounds》1994,30(1):103-106
By the condensation of hydrochlorides of iminoesters of-alkylthiopropionic acids with o phenylenediamine, o-aminophenols, hydrazides of acids, and thiosemicarbazide, we have synthesized 2-substituted benzimidazoles and benzoxazoles, 2, 5-disubstituted 1, 3, 4-oxadiazoles, and 2-amino-5-substituted 1, 3, 4-thiadiazoles containing-alkylthiioethyl fragments.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 1, pp. 115–118, January, 1994. 相似文献
3.
Antigoni Kotali Anna Maniadaki Elvira Kotali Philip A. Harris Ewa Różycka-Sokołowska Piotr Bałczewski John A. Joule 《Tetrahedron letters》2017,58(6):512-515
A series of 4-phenyl-2-aryl-8-methyl-6-oxo-7-phenylhydrazo-2H,4H,6H,7H,8H[1,3,4,2]-oxadiazaborolo[2,3-b][1,3,2]oxazaborines were prepared in high yields via the reaction of phenylboronic acid with various N-acylhydrazones of 3-keto-2-(2′-phenylhydrazono) butanoic acid in the presence of 4 Å molecular sieves. These derivatives represent a novel class of zwitterionic, tetrahedral boron heterocycles. Single crystal X-ray analysis of a representative boron containing product is reported. 相似文献
4.
Frank Hipler 《Journal of Molecular Structure》2003,658(3):179-191
The synthesis and crystal structures of three mercapto functionalised 1,3,4-thiadiazoles and the crystal structure of 2-mercapto-5-methyl-1,3,4-thiadiazole are described. In the solid state, 2-mercapto-5-methyl-1,3,4-thiadiazole 1 forms a thioamide tautomer as shown by FTIR and Raman spectroscopy as well as X-ray crystallography and as theoretically predicted. The molecules are connected to form chains via N-H?S hydrogen bonds with N?S=328.3 pm. Bis(2-methyl-1,3,4-thiadiazolyl)-5,5′-disulfide 2, the disulfide of 1, as well as 2-(tert-butyldithio)-5-methyl-1,3,4-thiadiazole 3 and 2,5-bis(tert-butyldithio)-1,3,4-thiadiazole 4 have been synthesised and characterised by vibrational spectroscopy and X-ray diffraction. 相似文献
5.
Two novel cobalt(Ⅱ) compounds were obtained and characterized by X-ray single-crystal diffraction,IR,1H NMR and elemental analysis.Compound 1 crystallizes in monoclinic,space group P21/n,with a = 18.046(4),b = 11.335(3),c = 19.157(5) ,β = 92.707(3)o,Z = 4,V = 3914.4(16) 3,Mr = 968.56,Dc = 1.644 g/cm3,μ = 1.378 mm-1,F(000) = 1960,the final R = 0.0367 and wR = 0.0895.The crystal of compound 2 is of monoclinic,space group P21/c with a = 8.7253(10),b = 10.9031(13),c = 18.235(2) ,β = 93.2210(10)o,Z = 4,V = 1732.0(3) 3,Mr = 464.21,Dc = 1.780 g/cm3,μ = 1.560 mm-1,F(000) = 932,the final R = 0.0322 and wR = 0.0743. 相似文献
6.
7.
Biswanath Das Gandolla Chinna Reddy Penagaluri Balasubramanyam N. Salvanna 《Tetrahedron》2012,68(1):300-305
The first direct C–H alkenylation of 1,3,4-oxadiazoles with trans-β-halo olefinic system has been carried out using a combination of CuI/DMEDA as a catalyst. A wide range of 2-E-vinyl-substituted oxadiazoles were obtained in high yields (85–93%). 相似文献
8.
O. U. Nesterova A. S. Pugachova M. V. Voevudsky O. V. Krischik V. I. Musatov 《Chemistry of Heterocyclic Compounds》2011,46(12):1520-1526
Cyclization of the hydrazide of 5-ethoxycarbonyl-2,6-dimethylpyridine-3-carboxylic acid by acylation with aromatic or aliphatic
acid chlorides with subsequent boiling in POCl3 or heating in orthoformic acid gave the corresponding ethyl 2,6-dimethyl-5-(5-R-1,3,4-oxadiazol-2-yl)pyridine-3-carboxylate.
The cyclization of the reaction products with hydrazine hydrate has been studied. Cyclization of the dihydrazide of 2,6-dimethyl-3,5-pyridinedicarboxylic
acid under analogous conditions gave only 3,5-bis-(5-R-1,3,4-oxadiazol-2-yl)-2,6-dimethylpyridines, containing R = 2-FC6H4, H. 相似文献
9.
β-Amino-α-phenyl-α-ferrocenylethanol, FcC(OH)(Ph)CH2NH2 was prepared by the reduction of cyanohydrin trimethylsilyl ether of benzoylferrocene with lithium aluminum hydride. This new compound was characterized by elemental analysis, IR and 1H NMR spectroscopy. The structure was also confirmed by a single crystal X-ray study. The compound crystallizes in monoclinic P21/c space group with unit cell dimensions: a = 12.5906(17), b = 5.9636(8), c = 19.8320(3) Å, β = 102.047(2)∘, V = 1456.3(3) Å3, Z = 4. The structure exhibits intra- and inter-molecular hydrogen bonding of the type N—H⋅ < eqid1 > ⋅O and O—H⋅ < eqid2 > ⋅N, respectively. The pattern of the inter-molecular hydrogen bonding interaction contains a 10-atom ring with two donors and two acceptors, showing a dimeric crystal packing. 相似文献
10.
ZHANG Zi-Yi ZOU NingNational Laboratory of Applied Organic Chemistry Department of Chemistry Lanzhou University Lanzhou Gansu China 《中国化学》1995,13(5):448-453
In this paper , 10 novel 6-aryl-3-(5'-phenyl-2H-tetrazole-2'-methylene)-S-triazolo[3, 4-b]-1,3,4-thiadiazoles have been synthesized by the condensation of 3-(5'-phenyl-2H-tetrazole-2'-methylene)-4-amino-5-mercapto-1,2,4-triazole with various aromatic carboxylic acids in the presence of phosphorus oxychloride. The structure of these compounds was determined by elemental analysis , UV, IR, 1H NMR and MS. Their spectral properties were also discussed. 相似文献
11.
The reaction of 1-amino-2-nitroguanidine with α-diketones (butane-2,3-dione and 1,2-diphenylethanedione) produced new specimens of nitroamino-containing 1,2,4-triazines. The structure of the synthesized compounds of linear and heterocyclic series was confirmed by 1H, 13C{1H} NMR, IR, and UV spectra. 相似文献
12.
Esanov R. S. Bobakulov Kh. M. Abdullaev N. D. Gafurov M. B. Yuldashev Kh. A. 《Chemistry of Natural Compounds》2021,57(2):335-338
Chemistry of Natural Compounds - A series of new 3-O-acetyl-18β -H-glycyrrhetic acid amides with S-containing heterocyclic amines (2-aminothiadiazole; 2-amino-5-methyl-, ethyl-, propyl-, and... 相似文献
13.
Beresnevichyus Z. I. G. Vilyunas V. Yu. Raudelyunas V. I. Baltrushis R. S. 《Chemistry of Heterocyclic Compounds》1992,28(1):71-75
The reaction of 2-amino- and 2-amino-5-halopyridines with acrylic, methacrylic, and crotonic acids forms N-(2-pyridyl)- and N-(5-halo-2-pyridyl)--alanines and the betaines 2-amino-1-(2-carboxylatoethyl)pyridinium or 3,4-dihydropyrido[1,2-a]pyrimidin-2-ones, or their homologs.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 1, pp. 80–85, January, 1992. 相似文献
14.
IntroductionSchiffbases ,amides ,imidazolo[2 ,1 b] 1,3,4 thiadiazoles,and 7H s triazolo[3,4 b] 1,3,4 thiadi azinescontainingheterocycleshavebeenattractingmuchattentionaspotentialantifungalagents .1 51,2 ,3 tria zole ,6 7mercapto 1,2 ,4 triazole ,81,3,4 thiadiazole9 10andtheirrelatedco… 相似文献
15.
β-amino-α,α-dichloro sulfones 3 are prepared by the reaction of vinyl sulfone 1 with primary or secondary amines 2in the presence of CCI4 and NaH. 相似文献
16.
《Arabian Journal of Chemistry》2014,7(6):947-954
The compounds styryl 1,3,4-thiadiazoles were prepared adopting one and two step methodologies to optimize the yield of the products. The two-step methodology via benzohydrazide followed by treatment with Lawesson’s reagent in the presence of Propylphosphonic anhydride and triethylamine produced styryl 1,3,4-thiadiazoles in excellent yields. The olefin moiety in these compounds is utilized to develop pyrazole and isoxazole rings by 1,3-dipolar cycloaddition methodology followed by oxidation. 相似文献
17.
M. R. Serafini P. P. Menezes L. P. Costa C. M. Lima L. J. Quintans Jr J. C. Cardoso J. R. Matos J. L. Soares-Sobrinho S. Grangeiro Jr P. S. Nunes L. R. Bonjadim A. A. S. Araújo 《Journal of Thermal Analysis and Calorimetry》2012,109(2):951-955
In this investigation, the study of inclusion complexes formation between p-cymene and ??-cyclodextrin using the methods of physical mixture, paste (PC) and slurry (SC), was evaluated. The results of DSC and TG/DTG showed that the products prepared by PC and SC methods were able to incorporate greater amounts of p-cymene, as evidenced by the weight loss of 7.15 and 3.97%, respectively, which occurred between 120 and 270?°C. SEM images showed decreased size of the household, especially in the SC product. The absorption bands in the IR spectrum, characteristic of p-cymene, were also identified in the preparations, indicating the presence of the compound in the complex. 相似文献
18.
2-Methyleneaminonaphthalene smoothly reacts with cyclic -diketones to afford azaphenanthrene derivatives in high yield. The dihydropyridine ring in the products can be oxidized to pyridine ring. The oxidation products, unlike their precursors and analogs having an aryl substituent in the -position with respect to the nitrogen atom, react with hydroxylamine at the carbonyl group to give the corresponding oximes and in some cases undergo Knoevenagel condensation with malononitrile. Hydrolysis of the condensation product yields the respective diamide. 相似文献
19.
《Tetrahedron》1987,43(6):1169-1176
The acetonation of lactose with 2-methoxypropene afforded 4,6-O-isopropylidene lactose (2) and a diacetal which, after acetylation, gave an α,β-anomeric mixture of 1, 2,6,3'-tetra-O-acetyl-3,2':4',6'-di-O-isopropylidene lactose (4). Acetonation of benzyl b-lactoside afforded the mixed acetals benzyl 6,6'-di-O-(methoxydimethyt)methyl (6), 6'-O-(methoxydimethyl)methyl-(7) and 6-O-(methoxydimethyl) methyl-β -lactoside (8), the cyclic acetal benzyl 4',6'-O-isopropylidene.-β-lactoside (9) and a diacetal which, after acetylation gave benzyl 2, 6, 3'-tri-O-acetyl-3,2':4',6'-di-O-isopropylidene-β-lactoside (11). The favoured formation of eight-membered 3,2'-cyclic acetals in lactose derivatives has been further demonstrated by acetonation of benzyl 2,3',6'-tri-O-benzyl-β-lactoside (13) and benzyl 2,6,3',6'-tetra-O-benzyl-b-lactoside (12). As an example of the synthetic utility of this acetonation reaction, the chiral macrocyclic polyhydroxyether 25 has been synthesized from benzyl 3',4'-O-isopropylidene-β-lactoside. 相似文献