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1.
《Journal of heterocyclic chemistry》2017,54(6):3294-3298
A series of novel 11‐aroyldiindeno[1,2‐b :2′,1′‐e ]pyridine‐10,12‐dione derivatives were synthesized, in good to excellent yields and short reaction times via one‐pot, three‐component reactions between indan‐1,3‐dione, ammonium acetate, and arylglyoxal hydrates in the presence of solid p ‐toluenesulfonic acid. 相似文献
2.
The novel 1,2‐diaryl substituted pyrrolo[3,4‐b]pyridine‐5,7‐diones were selectively synthesized in high yields by the base catalyzed cyclization reaction of 3‐arylamino‐1‐methyl‐1H‐pyrrole‐2,5‐diones with cinnamaldehyde and its derivatives in acetonitrile at room temperature. However, when piperidinium trifluoroacetate was employed as catalyst, the reaction afforded a mixture of 1,2‐diaryl and 1,4‐diaryl substituted pyrrolo[3,4‐b]pyridine‐5,7‐diones in comparable yields. 相似文献
3.
Synthesis of Novel 1H‐Imidazol[1,2‐a]Indeno[2,1‐e]Pyridine‐6(5H)‐Ones Derivatives via a One‐Pot Four‐Component Condensation Reaction 下载免费PDF全文
1H‐imidazol[1,2‐a]indeno[2,1‐e]pyridine‐6(5H)‐ones derivatives were synthesized in a one‐pot four‐component condensation of corresponding aldehydes, 1,3‐indandione, diamine, and nitro ketene dithioacetal using KAl(SO4)2·12H2O (alum) as nontoxic, reusable, inexpensive and easily available catalyst in good to excellent yields. This green protocol provides a powerful entry into fused polycyclic structures related to bioactive heterocycles. 相似文献
4.
《Journal of heterocyclic chemistry》2018,55(7):1798-1803
Novel pyrazolo[l,5‐a]pyridine derivatives containing (3‐oxocyclohex‐1‐enyl) amino group at position 2 were synthesized in good yields using simple and efficient methodology. All new compounds are characterized by the different spectral tools. 相似文献
5.
Synthesis and Antibacterial Activity of New 2,5‐Diaryl‐3‐styryl‐4H,2,3,3a,5,6,6a‐hexahydropyrrolo[3,4‐d]isoxazole‐4,6‐diones 下载免费PDF全文
The synthesis of some biologically interesting pyrrolo‐isoxazolidine derivatives has been accomplished by the 1,3‐dipolar cycloaddition reaction of substituted open chain conjugated azomethine N‐oxides 1 with substituted N‐aryl maleimides 2 leading to the formation of new stereoisomeric 2,5‐diaryl‐3‐styryl‐4H,2,3,3a,5,6,6a‐hexahydropyrrolo[3,4‐d]isoxazole‐4,6‐dione derivatives 3 in excellent yields. These stereoisomers have been characterized as cis‐ 3A and trans‐ 3B on the basis of their 1H‐NMR spectral measurements. The synthesized compounds have been screened for their antibacterial activities and have been found to be active against the bacteria Escherichia coli and Pseudomonas aeruginosa up to a significant extent. 相似文献
6.
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
7.
Fused Heterocycles: Synthesis and Antitubercular Activity of Novel 6‐Substituted‐2‐(4‐methyl‐2‐substituted phenylthiazol‐5‐yl)H‐imidazo[1,2‐a]pyridine 下载免费PDF全文
Yogita K. Abhale Keshav K. Deshmukh Amit V. Sasane Abhijit P. Chavan Pravin C. Mhaske 《Journal of heterocyclic chemistry》2016,53(1):229-233
A series of 6‐substituted‐2‐(4‐methyl‐2‐substituted phenylthiazol‐5‐yl)H‐imidazo[1,2‐a]pyridine derivatives 4a , 4b , 4c , 4d , 4e , 4f , 4g , 4h , 4i , 4j , 4k , 4l is described. The antitubercular activity of the synthesized compounds was determined against Mycobacterium smegmatis MC2 155 strain. From the activity result, it was found that the phenyl or 4‐fluorophenyl group at 2 position of thiazole nucleus and bromo substituent at 6 position of imidazo[1,2‐a]pyridine showed good antitubercular activity. 相似文献
8.
《Journal of heterocyclic chemistry》2017,54(5):2844-2849
Novel bis‐chromeno[2,3‐b ]pyridine derivatives were synthesized with good yields by a clean and efficient methodologies involving one‐pot three‐component synthesis of bis‐aldehydes, malononitrile dimer, and dimedone in the presence of piperidine as a catalyst in EtOH. Depending on the length and position of the spacer in the bis‐aldehyde derivatives 1 , the reactions proceeded to give either the bis(2,4‐diamino‐tetrahydro‐5H‐chromeno[2,3‐b ]pyridine‐3‐carbonitriles) 4 or bis(4‐amino‐2,6‐dioxo‐hexahydro‐2H‐chromeno[2,3‐b ]pyridine‐3‐carbonitriles) 5 . All of the new compounds have been characterized by spectral data. 相似文献
9.
Synthesis,Characterization, and Antibacterial Activity of Some Novel Substituted Imidazole Derivatives via One‐pot Three‐Component 下载免费PDF全文
Raj Kumar Ramagiri Murali Krishna Thupurani Rajeswar Rao Vedula 《Journal of heterocyclic chemistry》2015,52(6):1713-1717
A simple and highly efficient one‐pot, three‐component synthesis of novel substituted imidazole derivatives has been reported by the reaction of 3‐(2‐bromoacetyl)‐2H‐chromen‐2‐one, ammonium thiocyanate, and phenacyl aniline in the presence of acetic acid as a solvent under reflux condition with good yields. The structures of newly synthesized compounds were characterized by their analytical and spectral data. One of these compounds 4a showed good antibacterial activity against Escherichia coli gram‐negative strains. 相似文献
10.
《Journal of heterocyclic chemistry》2017,54(3):2003-2011
A simple facile “one‐pot” synthesis of 5‐(4‐chlorophenyl)‐7‐(3,4‐dimethyl phenyl)‐2‐oxo‐2H‐pyrano[2,3‐b]pyridine derivatives via three‐component reaction of chalcone, ethyl‐2‐substituted acetate, and ammonium acetate under ultrasonic irradiation and grinding tools. The newly synthesized compounds were evaluated for their antibacterial activity against ATCC 25923, ATCC 10987, ATCC 274, and SM514. All the synthesized compounds have been characterized on the basis of their elemental analyses and spectral data. 相似文献
11.
Synthesis of Novel 3‐(3‐(5‐Methylisoxazol‐3‐yl)‐7H‐[1,2,4]Triazolo [3,4‐b][1,3,4]Thiadiazin‐6‐yl)‐2H‐Chromen‐2‐Ones 下载免费PDF全文
A novel series of coumarin substituted triazolo‐thiadiazine derivatives were designed and synthesized by using 5‐methyl isoxazole‐3‐carboxylic acid ( 1 ), thiocarbohydrazide ( 2 ), and various substituted 3‐(2‐bromo acetyl) coumarins ( 4a , 4b , 4c , 4e , 4d , 4f , 4g , 4h , 4i , 4j ). Fusion of 5‐methyl isoxazole‐3‐carboxylic acid with thiocarbohydrazide resulted in the formation of the intermediate 4‐amino‐5‐(5‐methylisoxazol‐3‐yl)‐4H‐1,2,4‐triazole‐3‐thiol ( 3 ). This intermediate on further reaction with substituted 3‐(2‐bromo acetyl) coumarins under simple reaction conditions formed the title products 3‐(3‐(5‐methylisoxazol‐3‐yl)‐7H‐[1,2,4]triazolo[3,4‐b][1,3,4]thiadiazin‐6‐yl‐2H‐chromen‐2‐ones ( 5a , 5b , 5c , 5d , 5e , 5f , 5g , 5h , 5i , 5j ) in good to excellent yields. All the synthesized compounds were well characterized by physical, analytical, and spectroscopic techniques. 相似文献
12.
Cobalt‐Catalyzed Cyclization of N‐Methoxy Benzamides with Alkynes using an Internal Oxidant through C−H/N−O Bond Activation 下载免费PDF全文
Ganesan Sivakumar Arjun Vijeta Dr. Masilamani Jeganmohan 《Chemistry (Weinheim an der Bergstrasse, Germany)》2016,22(17):5899-5903
The cyclization of substituted N‐methoxy benzamides with alkynes in the presence of an easily affordable cobalt complex and NaOAc provides isoquinolone derivatives in good to excellent yields. The cyclization reaction is compatible with a range of functional group‐substituted benzamides, as well as ester‐ and alcohol‐substituted alkynes. The cobalt complex [CoIIICp*(OR)2] (R=Me or Ac) serves as an efficient catalyst for the cyclization reaction. Later, isoquinolone derivatives were converted into 1‐chloro and 1‐bromo substituted isoquinoline derivatives in excellent yields in the presence of POCl3 or PBr3. 相似文献
13.
Zhen Wang Zuliang Zhang Qian Yao Prof. Dr. Xiaohua Liu Yunfei Cai Dr. Lili Lin Prof. Dr. Xiaoming Feng 《Chemistry (Weinheim an der Bergstrasse, Germany)》2013,19(26):8591-8596
The highly Z‐selective asymmetric conjugate addition of 3‐substituted oxindoles to alkynyl carbonyl compounds has been developed by using scandium complexes of chiral N,N′‐dioxides under mild conditions. The thermodynamically unstable Z‐olefin derivatives were obtained in excellent yields and high enantiomeric and geometric control. The catalyst was also found to be effective in the asymmetric acetylenic substitution reaction of 3‐substituted oxindoles, giving excellent enantioselectivities. 相似文献
14.
Xiao‐Hui Yang Yong‐Hong Zhou Ping‐Hu Zhang Li‐Yun Zhang 《Journal of heterocyclic chemistry》2013,50(6):1346-1350
A convenient, rapid, and environmentally benign protocol is described for the preparation of fully substituted pyridine derivatives via four‐component reactions between 2‐substituted acetophenones, aromatic aldehydes, malononitrile, and ammonium acetate under microwave irradiation with good yield and without solvent. 相似文献
15.
《Journal of heterocyclic chemistry》2017,54(1):546-550
A simple and efficient method has been described for the synthesis of acetyl and iodo derivatives of 4‐hydroxy‐6‐phenyl‐6H‐pyrano[3,2‐c ]pyridine‐2,5‐diones 1 and 4‐hydroxy‐1‐phenylpyridin‐2(1H )‐ones 5 . Compounds 1 with phenyl and alkyl substituent at C(7) and C(8), respectively, can be easily acetylated by refluxing in a mixture of acetic acid and polyphosphoric acid to give 3‐acetyl‐4‐hydroxy‐6‐phenyl‐6H‐pyrano[3,2‐c ]pyridine‐2,5‐diones 2 in excellent yields. Compounds 1 and 5 can be iodinated with iodine and anhydrous sodium carbonate in boiling dioxane to give 4‐hydroxy‐3‐iodo‐6‐phenyl‐6H‐pyrano[3,2‐c ]pyridine‐2,5‐diones 3 and 4‐hydroxy‐3‐iodo‐1‐phenylpyridin‐2(1H )‐ones 6 , respectively, in good yields. The structures were confirmed using infrared, nuclear magnetic resonance , and elemental analysis. 相似文献
16.
Anilkumar S. Patel Satishkumar D. Tala Pankajkumar B. Nariya Kartik D. Ladva Naval P. Kapuriya 《中国化学会会志》2019,66(3):247-252
Triethanolamine (TEOA), an inexpensive and eco‐friendly base, was used to efficiently catalyze the three‐component condensation reaction of heterocyclic/aromatic aldehyde, (α/β)‐naphthol, and malononitrile in water to give the corresponding substituted 2‐amino‐4H‐chromene derivatives with excellent yields. 相似文献
17.
Selective Activation of Fluoroalkenes with N‐Heterocyclic Carbenes: Synthesis of N‐Heterocyclic Fluoroalkenes and Polyfluoroalkenyl Imidazolium Salts 下载免费PDF全文
Matthew C. Leclerc Dr. Serge I. Gorelsky Bulat M. Gabidullin Ilia Korobkov Prof. R. Tom Baker 《Chemistry (Weinheim an der Bergstrasse, Germany)》2016,22(24):8063-8067
Selective reactions between nucleophilic N,N′‐diaryl‐heterocyclic carbenes (NHCs) and electrophilic fluorinated alkenes afford NHC fluoroalkenes in high yields. These stable compounds undergo efficient and selective fluoride abstraction with Lewis acids to give polyfluoroalkenyl imidazolium salts. These salts react at Cβ with pyrrolidine to give ammonium fluoride‐substituted salts, which give rise to conjugated imidazolium‐enamine salts through loss of HF. Alternatively, reaction with 4‐(dimethylamino)‐pyridine provides a Cα‐pyridinium‐substituted NHC fluoroalkene. These compounds were studied using multinuclear NMR spectroscopy, mass spectrometry, and X‐ray crystallography. Insight into their electronic structure and reactivity was gained through the use of DFT calculations. 相似文献
18.
A series of novel 5‐(2,3,4,5‐tetrahydro‐1H‐chromeno[2,3‐d]pyrimidin‐5‐yl)pyrimidione derivatives have been synthesized from substituted salicylaldehydes and barbituric acid or 2‐thiobarbituric acid in water catalyzed by phase transfer catalysis of triethylbenzyl ammonium chloride (TEBA). Elemental analysis, IR, 1H NMR, and 13C NMR elucidated the structures of all the newly synthesized compounds. In vitro antimicrobial activities of synthesized compounds have been investigated against Escherichia coli, Bacillus subtilis, Staphylococcus aureus, and Pseudomonas aeruginosa. These newly synthesized derivatives exhibited significant in vitro antibacterial activity. 相似文献
19.
Palladium‐Catalyzed Carbonylative [3+2+1] Annulation of N‐Aryl‐Pyridine‐2‐Amines with Internal Alkynes by CH Activation: Facile Synthesis of 2‐Quinolinones 下载免费PDF全文
Jianbin Chen Dr. Kishore Natte Dr. Anke Spannenberg Dr. Helfried Neumann Prof. Dr. Matthias Beller Prof. Dr. Xiao‐Feng Wu 《Chemistry (Weinheim an der Bergstrasse, Germany)》2014,20(44):14189-14193
We describe here a novel procedure for the synthesis of highly substituted 2‐quinolinones. By this newly developed approach, 2‐quinolinone derivatives were prepared in moderate to good yields by carbonylative cyclization of N‐aryl‐pyridine‐2‐amines and internal alkynes by C?H activation. Remarkably, [Mo(CO)6] was applied as a solid CO source and the reaction proceeded in an atom economic manner. 相似文献
20.
Sabbavarapu Narayana Murthy Bandaru Madhav Yadavalli Venkata Durga Nageswar 《Helvetica chimica acta》2010,93(6):1216-1220
Substituted benzene‐1,2‐diamine reacted with various α‐keto esters at 50° under mild conditions for 15 min using H2O as reaction medium, providing a variety of 3‐substituted quinoxalinone derivatives in excellent yields. The reaction was instantaneous, and products were isolated by simple filtration. 相似文献