共查询到20条相似文献,搜索用时 31 毫秒
1.
Xinglong Jiang Guang‐Pei Chen Kapa Prasad Oljan Repi
Thomas J. Blacklock 《Journal of heterocyclic chemistry》2006,43(6):1725-1728
A general method for the synthesis of 8‐hydroxy‐6‐substituted‐1,7‐naphthyridines is described using acylation of the dianion derived from tert‐butylamide 1 , followed by cyclization of the resulting intermediate ketones 2 with ammonium acetate. 相似文献
2.
Sivaperuman Saravanan Arumugam Nithya Shanmugam Muthusubramanian 《Journal of heterocyclic chemistry》2006,43(1):149-155
The synthesis of a new set of selenadiazoles, 4‐aryl‐5‐(1‐aryl‐2‐methyl‐2‐nitropropyl)‐1,2,3‐selenadiazoles ( 4 ) derived from 2‐[4‐methyl‐4‐nitro‐1,3‐diarylpentylidene]‐1‐hydrazinecarboxamide ( 3 ) has been reported. THF has been found to be the solvent of choice for this reaction. Structural features of 3 and 4 have been analyzed by NMR and X‐ray techniques. 相似文献
3.
Sergey M. Desenko Evgeny S. Gladkov Svetlana V. Shishkina Oleg V. Shishkin Sergey A. Komykhov Valery D. Orlov Herbert Meier 《Journal of heterocyclic chemistry》2006,43(6):1563-1567
The condensation of 5‐amino‐4‐phenyl‐1,2,3‐triazole ( 1 ) with chalcones 2a‐e or 3‐dimethylamino‐propiophenone ( 4f ) leads to the 6,7‐dihydro‐(1,2,3)‐triazolo[1,5‐a]pyrimidines 3a‐f. The equilibrium of 3 and the tautomeric 4,7‐dihydro‐(1,2,3)‐triazolo[1,5‐a]pyrimidines 3′ is described. 相似文献
4.
Cyclocondensation of 2‐acylphenylacetonitriles 1 with amines affords 1‐substituted 3‐aminoisoquinolines 2 in good yields. 相似文献
5.
Xi Cun Wang Fang Wang Zheng Jun Quan Zhang Zhang Man Gang Wang 《Journal of heterocyclic chemistry》2006,43(6):1473-1477
The one‐pot two‐step synthesis for acyliminothiazolines by treatment of N,N'‐substituted thioureas with α‐bromocarbonyl compounds under aqueous media was described. Compared to classical reaction in organic solvents, this method consistently has the advantages of short reaction time and being environmentally friendly. 相似文献
6.
Javad Azizian Ali A. Mohammadi Ebrahim Soleimani Ali R. Karimi Mohammad R. Mohammadizadeh 《Journal of heterocyclic chemistry》2006,43(1):187-190
A mild and stereoselective three‐component one‐step synthesis of cis‐isoquinolonic acid using silica sulfuric acid as a heterogeneous catalyst from an aldehyde, amine and homophthalic anhydride in acetonitrile is described. This new method produces pure products in high yields (81‐91%). 相似文献
7.
B. R. Prashantha Kumar M. J. Nanjan B. Suresh M. D. Karvekar L. Adhikary 《Journal of heterocyclic chemistry》2006,43(4):897-903
Novel microwave induced method for the synthesis of thiazolidine‐2,4‐dione motif under solvent phase conditions is developed. Further we report an efficient, microwave assisted method for the parallel syntheses of biologically important 5‐benzylidene‐thiazolidine‐2,4‐dione and 5‐benzylidene‐2‐thioxothiazolidine‐4‐one compounds under solid‐phase and solvent‐free conditions. A comparative study between the developed microwave methods and the conventional methods is described. We have also illustrated the possible mechanism behind to address the reason why piperidine, acetic acid and silica gel enhanced the Knoevenagel condensation reaction. 相似文献
8.
A convenient and efficient method for the preparation of 3‐aryl‐chromene‐2‐thiones was reported. These compounds 2a‐2o with various functional groups were synthesized in high yield by a KF/Al2O3 meditated reaction of deoxybenzoins with CS2 under mild conditions. 相似文献
9.
Malek Taher Maghsoodlou Nourollah Hazeri Sayyed Mostafa Habibi Khorassani Ghasem Marandi Mahmoud Nassiri 《Journal of heterocyclic chemistry》2006,43(2):481-484
The 1:1 intermediate generated by the addition of alkyl and aryl isocyanides to dialkyl acetylenedicarboxylate is trapped by 1,8‐diazafloren‐9‐one to yield iminolactones in good yields. 相似文献
10.
Ravi K. Ujjinamatada Raju S. Appala Yankanagouda S. Agasimundin 《Journal of heterocyclic chemistry》2006,43(2):437-441
New benzofuranyl‐1,3‐benzoxazines and 1,3‐benzoxazin‐2‐ones are synthesized in which benzofuran is coupled with 1,3‐benzoxazines and 1,3‐benzoxazin‐2‐ones through ‐CONH‐ and ‐COCH2‐ bridges, respectively. The antimicrobial activity of these compounds is reported. 相似文献
11.
I. Philipova G. Dobrikov K. Krumova J. Kaneti 《Journal of heterocyclic chemistry》2006,43(4):1057-1063
A series of 2‐substituted‐4(3H)‐quinazolinones 13‐20 has been synthesized in good yields using the reaction of double lithiated 2‐methylquinazolinone‐4 with a variety of aromatic aldehydes. They have been easily transformed in high yields into the corresponding 2‐substituted conjugated derivatives 21‐28 bearing terminal aryl groups by F3CCOOH mediated dehydration. 相似文献
12.
Martial Say Ekaterina Paliakov Maged Henary Lucjan Strekowski 《Journal of heterocyclic chemistry》2006,43(6):1613-1620
Facile synthetic approaches to 2‐phenylquinolin‐4‐amines containing an aminoalkyl group at N4 of the quinolin‐4‐amine and amino or aminoalkyl groups at the phenyl moiety are presented. 相似文献
13.
4‐Amino‐5‐bromo‐2‐substituted‐aminopyrimidines are readily obtained from the newly prepared 5‐bromo‐2,4‐dichloro‐6‐methylpyrimidine by sequential treatment with ethanolic ammonia and secondary amines. These compounds were successfully reacted with various isothiocyanates in the presence of sodamide in DMF to form the new thiazolo[4,5‐d] pyrimidine derivatives. 相似文献
14.
A. Kakanejadifard L. Mahmodi A. Yari A. Mohajeri 《Journal of heterocyclic chemistry》2006,43(6):1695-1697
3,7‐Di(3‐nitrophenyl)‐1,5‐dioxa‐3,7‐diazacyclooctane was prepared from 3‐nitroaniline and formaldehyde in acetonitrile. Conformational behavior of ring inversion of the molecule was studied so it prefers a crown conformation. The evaluated ΔG* was approximately 58.0 ± 1.0 kJ/mole. The X‐ray structure determination of the compound shows a crown conformation, in line with two‐anomeric effect in N‐C‐O moiety. 相似文献
15.
A general synthesis of 6‐azaoxindoles, substituted in the 3‐ and 5‐position, has been developed starting from 4‐methoxycarbomethyl‐3‐nitropyridine, via hydrogenation of the nitro group and cyclisation of the resulting 3‐amino‐4‐methoxycarbomethyl‐pyridine. 相似文献
16.
Chavonda J. Mills Nelly N. Mateeva Kinfe K. Redda 《Journal of heterocyclic chemistry》2006,43(1):59-64
Eighteen substituted chalcones, flavones and 3‐flavonols were synthesized and characterized using 1H‐NMR, IR and elemental analysis. The substitution pattern includes two halogen atoms, nitro and methyl groups in ring A as well as two or three methoxy groups in ring B. 相似文献
17.
D. Shobha M. Adharvana Chari P. Sadanandam K. Mukkanti 《Journal of heterocyclic chemistry》2008,45(4):1225-1227
DDQ catalyzes efficiently the three‐component condensation reaction of aldehyde, β‐ketoester and urea in refluxing acetonitrile to afford the corresponding dihydropyrimidinones. Compared to the classical Biginelli reaction conditions, this new approach consistently has the advantage of excellent yields (80‐92%) and short reaction times 1.5‐2.5 h. 相似文献
18.
Hyoung Seok Song Young Seok Song Kee‐Jung Lee 《Journal of heterocyclic chemistry》2006,43(6):1533-1538
A synthesis of mono‐ and di‐vinylquinolinediones based on substitution of the halogens in 6,7‐dihaloquinoline‐5,8‐diones by DABCO‐assisted enolate ion is described. Divinylquinolines undergo 6π‐electrocyclization by thermally to give the benzo[g]quinoline derivatives. 相似文献
19.
Zhang‐Gao Le Jian‐Ping Xu Huo‐Yu Rao Min Ying 《Journal of heterocyclic chemistry》2006,43(4):1123-1124
The one‐pot direct synthesis of 2‐aminobenzothiazoles from phenyl isothiocyanate and amines using a new reagent of 1‐butyl‐3‐methylimidazolium tribromide ([Bmim]Br3) in ionic liquid 1‐butyl‐3‐methylimidazolium tetraflouoroborate ([Bmim]BF4) is described. 相似文献
20.
A novel base promoted degradation of 3‐aryl‐2‐isoxazoline‐5‐carboxylic acid chlorides to aryl nitriles has been discovered. 相似文献