共查询到20条相似文献,搜索用时 15 毫秒
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Feng Shi Dianxiang Zhou Shujiang Tu Qingqing Shao Chunmei Li Longji Cao 《Journal of heterocyclic chemistry》2008,45(4):1065-1070
A series of furo[3,4‐b][4,7]phenanthroline and indeno[2,1‐b][4,7]phenanthroline derivatives were synthesized via a three‐component reaction of aromatic aldehydes, 6‐aminoquinoline and either tetronic acid or 1,3‐indanedione in water, under microwave irradiation without use of any catalyst. This green procedure offers several advantages including operational simplicity, clean reaction, and increased safety for small‐scale high‐speed synthesis. 相似文献
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Microwave assisted synthesis of thiazolo[3,2‐b][1,2,4]‐triazoles containing 1,8‐naphthyridine moiety
K. Mogilaiah M. Prashanthi S. Kavitha H. Sharath Babu 《Journal of heterocyclic chemistry》2007,44(5):1161-1163
A simple and efficient protocol for the synthesis of 5‐aryl‐2‐(2‐substituted‐1,8‐naphthyridin‐3‐yl)‐thiazolo[3,2‐b][1,2,4]triazoles ( 4 ) is achieved by cyclocondensation of 3‐(2‐substituted‐1,8‐naphthyridin‐3‐yl)‐1,2,4‐triazoles ( 3 ) with α‐halogenoketones in anhyd. methanol under microwave irradiation. The products are obtained in good yields and in a state of high purity. 相似文献
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The paper describes synthesis and antituberculosis activity of α‐[5‐(5‐amino‐1,3,4‐thiadiazol‐2‐yl)‐imidazol‐2‐ylthio]acetic acids ( 5a,b ). The compounds were tested against Mycobacterium tuberculosis strain H37Rv in comparison to rifampicin. Compounds exhibited low activity (MIC ≤ 6.25 μg/ml, % inhibition ≥ 24). 相似文献
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Ramaiyan Manikannan Shanmugam Muthusubramanian 《Journal of heterocyclic chemistry》2008,45(4):1207-1210
Reaction of 2‐(5‐substituted‐2‐hydroxybenzylamino)phenols ( 2 ) with formalin in ethanol under reflux has chemoselectively led to 2‐(6‐substituted‐2H—benzo[e][1,3]oxazin‐3(4H)‐yl)phenols ( 3 ) in good yield involving the ring closure of the hydroxyl group of the C‐aryl ring and not that of the N‐aryl ring. 相似文献
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Reddeppareddy Dandu Ming Tao Kurt A. Josef Edward R. Bacon Robert L. Hudkins 《Journal of heterocyclic chemistry》2007,44(2):437-440
A regiospecific approach to each N‐methyl‐5‐(1H‐indol‐2‐yl)‐6,7‐dihydro‐2H‐indazole isomer is reported. The 1‐methyl isomer 1 was prepared from 5‐bromo‐1‐methyl‐6,7‐dihydro‐1H‐indazole 3 and indole‐2‐boronate 5 by palladium catalyzed Suzuki coupling. The 2‐methyl regioisomer 2 was synthesized via addition of lithium (1‐carboxylato‐1H‐indole‐2‐yl)lithium 6 with 2‐methyl‐2,4,6,7‐tetrahydro‐indazol‐5‐one 8 followed by acid catalyzed dehydration. 相似文献
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The title compound 3 was prepared in four steps from commercial 3‐amino‐2‐naphthoic acid in an overall 75 % yield. Attempts to use the same approach in the case of 2‐aminonicotinic acid methyl ester failed. All the compounds were characterized by NMR. 相似文献
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(Un)substituted benzaldehyde (5‐aryl‐1,3,4‐thiadiazol‐2‐yl)hydrazones were efficiently synthesized by reactions of (un)substituted benzaldehyde thiocarbohydrazones with aromatic carboxylic acids by using silica‐supported dichlorophosphate as a recoverable dehydrant under microwave irradiation. The protocol has advantages of short reaction time, high yield, easy work‐up procedure and no environmental pollution. 相似文献
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John D. Knight Jordan B. Brown Jason S. Overby Charles F. Beam N. Dwight Camper 《Journal of heterocyclic chemistry》2008,45(1):189-194
Select C(α), N‐carbo‐tert‐butoxyhydrazones were dilithiated with excess lithium diisopropylamide followed by condensation with methyl 2‐(aminosulfonyl)benzoate, acid cyclization, hydrolysis, and decarboxylation to afford new 2‐(1H‐pyrazol‐5‐yl)benzenesulfonamides, [NH‐pyrazolyl‐ortho‐benzene‐sulfonamides]. 相似文献
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Ganesh R. Jadhav Mohammad U. Shaikh Murlidhar S. Shingare Charansingh H. Gill 《Journal of heterocyclic chemistry》2008,45(5):1287-1291
Synthesis of some novel 2‐{2‐[1‐(3‐substitutedphenyl)‐1H‐1,2, 3‐triazol‐4‐yl‐]ethyl)‐1H‐benzo[d]‐imidazole derivatives, by the condensation of o‐phenylenediamine with 3‐(1‐(3‐substituted‐phenyl)‐1H‐1,2,3‐triazol‐4‐yl) propanoic acid and then subsequent reactions with different substituted alkyl halides as electrophiles are mentioned. The synthesized compounds were characterized by 1H NMR, EI‐MS and IR spectroscopic techniques. 相似文献