共查询到20条相似文献,搜索用时 15 毫秒
1.
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
2.
Khodabakhsh Niknam Seyed Mehdi Razavian Mohammah Ali Zolfigol Iraj Mohammahpoor‐Baltork 《Journal of heterocyclic chemistry》2006,43(1):199-202
A combination of methanesulfonic acid and sodium nitrite in the presence of wet SiO2 was used as an effective oxidizing agent for the oxidation of 1,4‐dihydropyridines to the corresponding pyridine derivatives under mild and heterogeneous conditions in excellent yields. 相似文献
3.
Shashi U. Pandya Urvish R. Pandya Bhanu R. Hirani Dinker I. Brahmbhatt 《Journal of heterocyclic chemistry》2006,43(3):795-798
Various diarylpyrido[3,2‐c]coumarins 3a‐l have been synthesized in one step by reacting 4‐hydroxy coumarins 1a‐d with α,β‐unsaturated ketones 2a‐c in the presence of ammonium acetate and acetic acid under Kroehnke's reaction conditions. 相似文献
4.
Shujiang Tu Jinpeng Zhang Xiaotong Zhu Yan Zhang Qian Wang Jianing Xu Bo Jiang Runhong Jia Junyong Zhang Feng Shi 《Journal of heterocyclic chemistry》2006,43(4):985-988
Four‐component cyclocondensation of aromatic aldehydes, malononitrile, dimedone and ammonium acetate proceeds under microwave irradiation in solvent free conditions to give highly functionalized hexahydroquinolines in excellent yields. 相似文献
5.
Fifteen novel 1‐(substituted phenylcarbonyl/sulfonylamino)‐1,2,3,6‐tetrahydro‐ pyridine‐5‐carboxylic acid diethylamide ( 7, 15 ) were synthesized in fair to good yields via sodium borohydride reduction of the corresponding 1‐(substituted phenylcarbonyl/ sulfonylimino)‐3‐diethylcarbamoyl pyridinium ylides ( 6, 14 ) in absolute ethanol. 相似文献
6.
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
7.
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
8.
Avijit Banerji Pizush Kanti Biswas Debasish Bandyopadhyay Maya Gupta Thierry Prangé Alain Neuman 《Journal of heterocyclic chemistry》2007,44(1):137-143
Investigation of cycloadditions of C‐aryl‐N‐(4‐chlorophenyl)nitrones to N‐cinnamoyl piperidines was carried out. Two diastereoisomeric and one regioisomeric cycloadducts, and in some cases ring‐opened compounds were characterized by spectroscopic and X‐ray data. Molecular modelling was carried out for conformational studies. 相似文献
9.
A novel base promoted degradation of 3‐aryl‐2‐isoxazoline‐5‐carboxylic acid chlorides to aryl nitriles has been discovered. 相似文献
10.
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
11.
Anand Sachar R. L. Sharma Surinder Kumar Daljeet Kaur Jasbir Singh 《Journal of heterocyclic chemistry》2006,43(5):1177-1181
The novel bis‐condensed heterocyclic systems with ring assemblies based on peripheral barbituric acid rings and central pyran, pyridine and thiine rings have been generated by the reaction of terephthalaldehyde and isophthalaldehyde with barbituric acid for comparison with the analogous systems generated with said dialdehydes and 1,3‐cyclohexanedione. 相似文献
12.
1‐Acetyl‐, 1‐propionyl‐ and 1‐phenyl‐3,5‐diaryl‐2‐pyrazolines have been synthesized by the reaction of the appropriate α,β‐unsaturated ketones with hydrazine or phenylhydrazine in hot acetic acid or propionic acid. Structures of all new 2‐pyrazolines 16‐40 have been elucidated by microanalyses, 1H and 13C nmr spectroscopies. 相似文献
13.
Mazaahir Kidwai Kavita Singhal Shweta Rastogi 《Journal of heterocyclic chemistry》2006,43(5):1231-1236
An expeditious and convenient solid supported synthesis of 1,3,7‐triaryl‐6‐phenyl‐2‐thioxo‐1,2,3,7‐tetrahydropyrrolo [2,3‐d]pyrimidin‐4‐one derivatives from readily accessible N,N‐disubstituted thiobarbituric acids under microwaves utilising Paal Knorr reaction is described. 相似文献
14.
Methyl‐3‐(2‐chloroquinolin‐3‐yl)acrylates 5a‐i on reaction with methyl amine in acetonitrile yielded methyl‐3‐[2‐(methylamino)quinolin‐3‐yl]acrylates 6a‐i . When, these were followed by the reaction with the Vilsmeier reagent, they afforded methyl benzo[b][1,8]naphthyridin‐3‐carboxylate 7a‐i in good yields. 相似文献
15.
Morpholinium salts coupled to oxazolyl moieties have been synthesized via nucleophilic substitution of a series of oxazolyl chlorides with morpholine. The oxazole moieties were first synthesized and then coupled with morpholine. The corresponding hydrochloride and methyl iodide salts were obtained, purified, characterized and then tested for muscarinic receptor binding affinity. Biological test results from MDS Pharma Services revealed no significant muscarinic receptor affinity. 相似文献
16.
H. D. Hollis Showalter 《Journal of heterocyclic chemistry》2006,43(5):1311-1317
Short pathways are described for the synthesis of a representative example of each of the 7,8‐dihydro‐and 1,2,3,4‐tetrahydro‐1,6‐naphthyridine‐5(6H)‐one ring systems from simple pyridine precursors. An attempted synthesis of the related 4,6‐dihydro‐1,6‐naphthyridin‐5(1H)‐one ring system from a common intermediate was unsuccessful. 相似文献
17.
Jrme Audoux Sylvain Achelle Alain Turck Francis Marsais Nelly Pl 《Journal of heterocyclic chemistry》2006,43(6):1497-1503
Using a regioselective metallation in connection with Stille cross‐coupling reaction, we report here an original synthetic route to obtain in few steps various flat tetra‐ or pentaheterocyclic compounds which could be potential intercalating DNA agents. 相似文献
18.
3‐Bromopyridine‐4‐carbaldehyde is cyclized with carboxylic acids in acetonitrile at 100° under carbon monoxide pressure in the presence of a catalytic amount of a palladium catalyst along with a base to afford the corresponding 3‐oxo‐1,3‐dihydrofuro[3,4‐c]pyridine‐1‐yl alkanoates in moderate to good yields. 相似文献
19.
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
20.
4′‐(Hydroxy, chloro, amino, acetoxy and methoxy)‐methyl‐4,5′‐dimethylangelicins were efficiently and rapidly synthesized via Claisen rearrangement of 4‐methyl‐7‐[4‐(hydroxy, chloro, amino, acetoxy and methoxy)‐but‐2‐ynyloxy]‐coumarins respectively under microwave irradiation. Prominent among the advantages of this new method are operational simplicity, good yields in short reaction times and easy work‐up procedures employed. 相似文献