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1.
Abdou O. Abdelhamid Shokry A. Shokry Sayed M. Tawfiek 《Journal of heterocyclic chemistry》2012,49(1):116-124
Naphtho[2,1‐b]furan‐2‐yl)(8‐phenylpyrazolo[5,1‐c][1,2,4]triazin‐3‐yl)methanone, ([1,2,4]triazolo[3,4‐c][1,2,4]triazin‐6‐yl)(naphtho[2,1‐b]furan‐2‐yl)methanone, benzo[4,5]imidazo[2,1‐c][1,2,4]triazin‐3‐yl‐naphtho[2,1‐b]furan‐2‐yl‐methanone, 5‐(naphtho[2,1‐b]furan‐2‐yl)pyrazolo[1,5‐a]pyrimidine, 7‐(naphtho[2,1‐b]furan‐2‐yl)‐[1,2,4]triazolo[4,3‐a]pyrimidine, 2‐naphtho[2,1‐b]furan‐2‐yl‐benzo[4,5]imidazo[1,2‐a]pyrimidine, pyridine, and pyrazole derivatives are synthesized from sodium salt of 5‐hydroxy‐1‐naphtho[2,1‐b]furan‐2‐ylpropenone and various reagents. The newly synthesized compounds were elucidated by elemental analysis, spectral data, chemical transformation, and alternative synthetic route whenever possible. J. Heterocyclic Chem., (2012). 相似文献
2.
Kamal M. El‐Shaieb 《中国化学会会志》2007,54(5):1353-1358
When 2,3‐dichloro‐1,4‐naphthoquinone (DCHNQ) ( 1 ) is allowed to react with 1‐phenylbiguanide (PBG) ( 2 ), 4‐chloro‐2,5‐dihydro‐2,5‐dioxonaphtho[1,2‐d]imidazole‐3‐carboxylic acid phenyl amide ( 4 ), 6‐chloro‐8‐phenylamino‐9H‐7,9,11‐triaza‐cyclohepta[a]naphthalene‐5,10‐dione ( 5 ) and 4‐dimethyl‐amino‐5,10‐dioxo‐2‐phenylimino‐5,10‐dihydro‐2H‐benzo[g]quinazoline‐1‐carboxylic acid amide ( 6 ) were obtained. While on reacting 1 with 2‐guanidinebenzimidazole (GBI) ( 3 ) the products are 3‐(1H‐benzoimidazol‐2‐yl)‐4‐chloro‐3H‐naphtho[1,2‐d]imidazole‐2,5‐dione ( 7 ) and 3‐[3‐(1H‐benzoimidazol‐2‐yl)‐ureido]‐1,4‐dioxo‐1,4‐dihydronaphthalene‐2‐carboxylic acid dimethylamide ( 8 ). 相似文献
3.
Oxidation of some derivatives of 4b,9b–dihydroxyindeno[1,2‐b]benzofuran‐10‐one have been investigated in detail using lead(IV) acetate in acetic acid under reflux conditions and periodic acid in aqueous ethanol at room temperature. We realized that during the first 5–15 minutes of the oxidation reactions in lead(IV) acetate/acetic acid system, 3H,3’H‐spiro[benzofuran‐2,1′‐isobenzofuran]‐3,3′‐dione derivatives have been synthesized chemo selectively, while, if the reaction mixtures stirred for additional 3 hours, the main products would be 2‐(2‐(Methoxycarbonyl)‐3‐oxo‐2,3‐dihydrobenzofuran‐2‐yl)benzoic acids. Moreover, room temperature oxidation of 4b,9b–dihydroxyindeno[1,2‐b]benzofuran‐10‐ones by periodic acid (H5IO6), leads to the formation of 3H,3’H‐spiro[benzofuran‐2,1′‐isobenzofuran]‐3,3′‐dione derivatives in good to excellent yields. 相似文献
4.
《Journal of heterocyclic chemistry》2017,54(1):151-154
Cyclocondensation of 5‐amino‐6‐methyl‐2‐morpholinopyrimidine‐4‐thiol ( 1 ) and 2‐bromo‐5,5‐dimethylcyclohexane‐1,3‐dione ( 2 ) under mild reaction condition afforded 4,7,7‐trimethyl‐2‐morpholino‐7,8‐dihydro‐5H‐benzo[b ]pyrimido[5,4‐e ][1,4]thiazin‐9(6H )‐one ( 3 ). The 1H and 13C NMR data of compound ( 3 ) are demonstrated that this compound exists primarily in the enamino ketone form. Reaction of compound ( 3 ) with phosphorous oxychloride gave 4‐(9‐chloro‐4,7,7‐trimethyl‐7,8‐dihydro‐6H‐benzo[b ]pyrimido[5,4‐e ][1,4]thiazin‐2‐yl)morpholine ( 4 ). Nucleophilic substitution of chlorine atom of compound ( 4 ) with typical secondary amines in DMF and K2CO3 furnished the new substituted derivatives of 4‐(4,7,7‐trimethyl‐7,8‐dihydro‐6H‐benzo[b ]pyrimido[5,4‐e ][1,4]thiazin‐2‐yl)morpholine ( 5a , 5b , 5c , 5d , 5e , 5f , 5g , 5h ). All the synthesized products were characterized and confirmed by their spectroscopic and microanalytical data. 相似文献
5.
2‐Acyl‐3‐aminonaphtho[2,1‐b]furan ( 1 ) reacts with activated methylene such as malono nitrile or ethyl cyanoacetate to afford naphtho[1′,2′:4,5]furo[3,2‐b]pyridine 2a,b . Chloroacylation of the amino group in compound ( 1 ) gave compound 3 which reacts with different amines to produce compound 4 . 相似文献
6.
The condensation of 4‐hydroxy‐6‐methyl‐2H‐pyran‐2‐one and substituted 2‐hydroxybenzaldehydes with ammonium acetate gave the title heterocycles. Synthesis of 1,5‐dihydro‐2‐methyl‐4H‐[1]naphtho‐[1′,2′:5,6]pyrano[4,3‐b]‐pyridine‐4,5‐dione is also described. A reaction mechanism is discussed. 相似文献
7.
Enzo Sottofattori Maria Anzaldi Alessandro Balbi Roberto Artali Gabriella Bombieri 《Helvetica chimica acta》2002,85(6):1698-1705
3‐[(3‐Aminopropyl)amino]‐1‐oxo‐1H‐naphtho[2,1‐b]pyran‐2‐carbaldehyde ( 10 ) was synthesized by nucleophilic substitution reaction of 2‐(3‐dimethylamino)‐1‐oxo‐1H‐naphtho[2,1‐b]pyran‐2‐carbaldehyde ( 9 ) and the monoprotected propane‐1,3‐diamine. The reaction with the unprotected reagent led to the unexpected 1‐(2‐hydroxynaphthalen‐1‐yl)‐2‐(tetrahydropyrimidin‐2(1H)‐ylidene)ethanone ( 6 ). Extension of this reaction to chromone 16 gave 1‐(2‐hydroxy‐3‐isopropyl‐6‐methylphenyl)‐2‐(tetrahydropyrimidin‐2(1H)‐ylidene)ethanone ( 7 ). The X‐ray crystal structures of 6 and 7 were also determined. 相似文献
8.
Yoshihisa Kurasawa Kazunori Sakurai Shinnosuke Kajiwara Kazuho Harada Yoshihisa Okamoto Ho Sik Kim 《Journal of heterocyclic chemistry》2000,37(5):1257-1263
The reaction of the 2‐(1‐alkylhydrazino)‐6‐chloroquinoxaline 4‐oxides 1a,b with diethyl acetone‐dicarboxylate or 1,3‐cyclohexanedione gave ethyl 1‐alkyl‐7‐chloro‐3‐ethoxycarbonylmethylene‐1,5‐dihydropyridazino[3,4‐b]quinoxaline‐3‐carboxylates 5a,b or 6‐alkyl‐10‐chloro‐1‐oxo‐1,2,3,4,6,12‐hexahydroquinoxalino[2,3‐c]cinnolines 7a,b , respectively. Oxidation of compounds 5a,b with nitrous acid afforded the ethyl 1‐alkyl‐7‐chloro‐3‐ethoxycarbonylmethylene‐4‐hydroxy‐1,4‐dihydropyridazino‐[3,4‐b]quinoxaline‐4‐carboxylates 9a,b , whose reaction with base provided the ethyl 2‐(1‐alkyl‐7‐chloro‐4‐oxo‐1,4‐dihydropyridazino[3,4‐b]quinoxalin‐3‐yl)acetates 6a,b , respectively. On the other hand, oxidation of compounds 7a,b with N‐bromosuccinimide/water furnished the 4‐(1‐alkyl‐7‐chloro‐4‐oxo‐1,4‐dihydropyridazino[3,4‐b]quinoxalin‐3‐yl)butyric acids 8a,b , respectively. The reaction of compound 8a with hydroxylamine gave 4‐(7‐chloro‐4‐hydroxyimino‐1‐methyl‐1,4‐dihydropyridazino[3,4‐b]quinoxalin‐3‐yl)‐butyric acid 12 . 相似文献
9.
Kamal M. El‐Shaieb 《中国化学会会志》2008,55(5):1150-1155
1‐(Dicyanomethylene)acenaphthene‐2‐one ( 1 ) reacts with 1,8‐diaminonaphthalene ( 2 ) to yield two products, identified as acenaphtho[1,2‐b]naphtho[1,8‐ef][1,4]diazepine ( 3 ) and (Z)‐2‐(8‐aminonaphthalen‐1‐ylamino)‐2‐(2‐oxoacenaphthylen‐1(2H)‐ylidene)acetonitrile ( 4 ). On the other hand, (2Z,2′Z)‐2,2′‐(hydrazine‐1,2‐diylidene)diacenaphthylen‐1(2H)‐one ( 6 ) was obtained during the condensation process of 1 with hydrazine hydrate ( 5 ). Reaction of 1 with 3,4‐diaminotoluene ( 8b ) produces 9‐methylacenaphtho[1,2‐b]quinoxaline ( 9b ) and (Z)‐2‐(2‐amino‐5‐methylphenyl‐amino)‐2‐(2‐oxoacenaphthylen‐1(2H)‐ylidene)acetonitrile ( 10b ). However, treatment of 5,6‐diamino‐pyrimidine‐2,4‐diol hemisulphate ( 11 ) with 1 affords acenaphtho[1,2‐g]pteridine‐9,11‐diol ( 12 ). 相似文献
10.
The reaction of 2,3-dibromo-1,4-naphthoquinone with 2-aminothiazole in MeONa/MeOH at 60oC for 3 h gave naphtho[2',3':4,5]imidazo[2,1-b][1,3]thiazole-5,10-dione
in 64% yield. The reaction of 2,3-dibromo-1,4-naphthoquinone with 2-aminobenzothiazole under the above-mentioned conditions
gave 2-(benzo[d]thiazol-2-ylamino)-3-bromonaphthalene-1,4-dione in 64% yield, which on treatment with Na/THF or NaN3/acetone under reflux conditions gave naphtho[2',3':4,5]imidazo[2,1-b][1,3]- benzothiazole-7,12-dione in 69 and 56% yields,
respectively. 相似文献
11.
Ahmad M. Farag Kamal M. Dawood Hatem A. Abdel‐Aziz Nehal A. Hamdy Issa M. I. Fakhr 《Journal of heterocyclic chemistry》2011,48(2):355-360
Reaction of E‐3‐(N,N‐dimethylamino)‐1‐(3‐methylthiazolo[3,2‐a]benzimidazol‐2‐yl)prop‐2‐en‐1‐one ( 1 ) with some N‐nucleophiles, such as anilines 2a , 2b , 2c , 4‐amino‐N‐pyridin‐2‐yl‐benzenesulfonamide ( 4a ), 4‐amino‐N‐pyrimidin‐2‐yl‐benzenesulfonamide ( 4b ), hydrazine, hydroxylamine, thiourea, and guanidine afforded the corresponding arylaminoprop‐2‐en‐1‐one derivatives 3a , 3b , 3c , 5a , 5b , the pyrazole, isoxazole, pyrimidinethione and aminopyrimidine derivatives 7a , 7b , 9a , and 9b , respectively. The utility of compound 1 , as a versatile building block, for the synthesis of the pyranone 13 , benzo[b]furan 17a , and naphtho[1,2‐b]furan 17b was also explored via its reaction with 2‐benzamidoacetic acid ( 10 ), 1,4‐benzoquinone ( 14a ), and 1,4‐naphthoquinone ( 14b ), respectively. J. Heterocyclic Chem., (2011). 相似文献
12.
Heptalenecarbaldehydes 1 / 1′ as well as aromatic aldehydes react with 3‐(dicyanomethylidene)‐indan‐1‐one in boiling EtOH and in the presence of secondary amines to yield 3‐(dialkylamino)‐1,2‐dihydro‐9‐oxo‐9H‐indeno[2,1‐c]pyridine‐4‐carbonitriles (Schemes 2 and 4, and Fig. 1). The 1,2‐dihydro forms can be dehydrogenated easily with KMnO4 in acetone at 0° (Scheme 3) or chloranil (=2,3,5,6‐tetrachlorocyclohexa‐2,5‐diene‐1,4‐dione) in a ‘one‐pot’ reaction in dioxane at ambient temperature (Table 1). The structures of the indeno[2,1‐c]pyridine‐4‐carbonitriles 5′ and 6a have been verified by X‐ray crystal‐structure analyses (Fig. 2 and 4). The inherent merocyanine system of the dihydro forms results in a broad absorption band in the range of 515–530 nm in their UV/VIS spectra (Table 2 and Fig. 3). The dehydrogenated compounds 5, 5′ , and 7a – 7f exhibit their longest‐wavelength absorption maximum at ca. 380 nm (Table 2). In contrast to 5 and 5′, 7a – 7f in solution exhibit a blue‐green fluorescence with emission bands at around 460 and 480 nm (Table 4 and Fig. 5). 相似文献
13.
. H. Üngren M. Samaci Y. Akamur C. Arici D. Ülkü 《Journal of heterocyclic chemistry》2004,41(2):151-155
The Wittig reaction of 2,3‐dihydro‐4‐(4‐methoxybenzoyl)‐5‐(4‐methoxyphenyl)‐furan‐2,3‐dione (1) with methyl (triphenylphosphoranylidene)acetate (2) stereo‐ and regioselectively afforded methyl (Z)‐[2,3‐dihydro‐4‐(4‐methoxybenzoyl)‐5‐(4‐methoxyphenyl)‐3‐oxofuran‐2‐ylidene]acetate (3) in good yield. The reactions of 3 with primary amines (4a‐k) gave corresponding 1‐substituted 2,3‐dihydro‐1Hpyrrol‐3‐ones (5a‐k). 相似文献
14.
Milda M. Burbuliene Rita Dobrovolskaite Povilas Vainilavicius 《Journal of heterocyclic chemistry》2006,43(6):1557-1561
The title ester 1 reacted with hydrazine hydrate to give hydrazide 2 , which underwent intramolecular cyclization to yield 1‐amino‐7‐phenyl‐1H‐imidazo[1,2‐a]pyrimidine‐2,5‐dione ( 3 ) or took place in a substitution reaction with benzylamine to form N‐benzyl‐2‐(2‐benzylamino‐4‐oxo‐6‐phenyl‐4H‐pyrimidin‐3‐yl)‐acetamide ( 4 ). The reaction of ester 1 with benzylamine gave corresponding amide 7 , disubstituted derivative 4 or 1‐benzyl‐7‐phenyl‐1H‐imidazo[1,2‐a]pyrimidine‐2,5‐dione ( 8 ) depending on the reaction conditions. 相似文献
15.
Strategy to Construct Stair‐Shaped Partially Reduced Naphtho[1,2‐b]pyrano[2,3‐d]oxepines and Dinaphtho[1,2‐b,d]oxepines 下载免费PDF全文
Sanjay K. Gautam Hardesh K. Maurya Ramendra Pratap Brijesh Kumar Abhinav Kumar Vishnu K. Tandon Vishnu Ji Ram 《Journal of heterocyclic chemistry》2016,53(6):2070-2078
A concise and efficient base‐induced synthesis of stair‐shaped, 4‐methylthio‐2‐oxo‐5,6‐dihydro‐2H‐naphtho[1,2‐b]pyran[2,3‐d]oxepine‐3‐carbonitriles ( 3 ) has been delineated by the reaction of 3,4‐dihydronaphtho[1,2‐b]oxepin‐5(2H)‐one ( 1 ) and methyl 2‐cyano‐3,3‐dimethylthioacrylate in DMSO using powdered KOH as a base at room temperature. Amination of 3 has been achieved by reaction with secondary amine in ethanol at reflux temperature to yield 4‐sec‐amino‐2‐oxo‐5,6‐dihydro‐2H‐naphtho[1,2‐b]pyran[2,3‐d]oxepine‐3‐carbonitriles ( 4 ). Reaction of 3 with aryl methyl ketone ( 5 ) in DMSO at room temperature using powdered KOH as a base produced stair‐shaped 5‐aryl‐7,8‐dihydro‐1,4‐dioxa‐2,3‐dioxodinaphtho[1,2‐b,d]oxepine ( 6 ) in good yields. However, reaction of 6‐aryl‐2H‐pyran‐2‐one‐3‐carbonitrile ( 8 ) with 3,4‐dihydronaphtho[1,2‐b]oxepin‐5(2H)‐one ( 1 ) did not give similar product, but in lieu 4‐aryl‐5,6‐dihydronaphtho[1,2‐b]oxepino[4,5‐b]pyran‐2‐ylidene)acetonitrile ( 9 ) was isolated and characterized. 相似文献
16.
Taisei Ueda Naoyoshi Yatsuzuka Shin‐Ichi Nagai Kumiko Okada Emi Takeichi Hiromi Segi Jinsaku Sakakibara 《Journal of heterocyclic chemistry》2001,38(1):141-145
Oxidation of 7,8‐diaminotheophylline (1) with lead tetraacetate in refluxing toluene gave a mixture of 3‐amino‐5,7‐dimethylpyrimido[4,5‐e][1,2,4]triazine‐6,8‐dione ( 2 ) and 6‐cyanoimino‐5‐diazo‐1,3‐dimethylpyrimidine‐2,4‐dione ( 4 ). The latter was transformed to 2 by the reaction with 1‐propanethiol in quantitative yield. The reaction of 4 with methanol, ethanol and 1‐propanol in the presence of rhodium ( II ) acetate gave 5‐alkoxy‐6‐(2‐alkyl‐3‐isoureido)‐1,3‐dimethylpyrimidine‐2,4‐diones ( 7a‐c ). A similar reaction of 4 with alkylamines such as n‐propylamine, n‐butylamine, isobutylamine and n‐hexylamine gave a mixture of 7‐alkyl‐8‐aminotheophyllines ( 8a‐d ) and (5‐alkylamino‐1,3‐dimethyl‐2,4‐dioxopyrimidin‐6‐yl)cyanamides ( 9a‐d ). 相似文献
17.
Milda M. Burbuliene Olegas Bobrovas Povilas Vainilavicius 《Journal of heterocyclic chemistry》2006,43(1):43-47
Treatment of ambident sodium salt of 2‐methylsulfanyl‐4(3H)‐quinazolinone with methyl bromoacetate resulted in N(3)‐alkyl ester formation. Reaction of the resulted ester with hydrazine hydrate gave 2‐methylsulfanyl‐4‐oxo‐3(4H)‐quinazolinyl)acetohydrazide, which underwent intramolecular cyclization under heating in dimethylformamide to give 1‐aminoimidazo[2,1‐b]quinazoline‐2,5(1H,3H)‐dione. The latter took place in acylation reaction and in condensation with aromatic aldehydes. 相似文献
18.
Ashraf A. Aly Alaa A. Hassan Alan B. Brown Kamal M. El‐Shaieb Tarek M. I. Bedair 《Journal of heterocyclic chemistry》2011,48(4):787-791
New imidazoles were easily prepared from 2,3‐diamino‐1,4‐naphthoquinone and stoichiometric quantities of the appropriate aldehydes in dimethyl sulfoxide as a solvent. The reaction proceeded for few hours. The procedure can be generalized to different classes of aldehydes. 2‐Methyl‐1H‐naphtho[2,3‐d]imidazole‐4,9‐dione was also obtained in good yield during refluxing of 2,3‐diaminonaphthoquinone in acetic acid. The structure of the newly synthesized imidazoles was extensively investigated using NMR experiments. J. Heterocyclic Chem., (2011). 相似文献
19.
4‐Ethoxycarbonyl‐5‐phenyl‐2,3‐dihydrofuran‐2,3‐dione 1 reacts with aldehydes via the acylketene intermediate 2 giving the 1,3‐dioxin‐4‐ones 3a‐e and the 1,4‐bis(5‐ethoxycarbonyl‐4‐oxo‐6‐phenyl‐4H‐1,3‐dioxin‐2‐yl)benzene 4 , and a one step reaction between dibenzoylmethane and oxalylchloride gave 3,5‐dibenzoyl‐2,6‐diphenyl‐4‐pyrone 7 . The reaction of 1 with dibenzoylmethane, a dicarbonyl compound, provided ethyl 3‐benzoyl‐4‐oxo‐2,6‐diphenylpyran‐5‐carboxylate derivative 9 . Compound 9 was converted into the corresponding ethyl 3‐benzoyl‐4‐hydroxy‐2,6‐diphenylpyridine‐5‐carboxylate derivative 10 via its reaction with ammonium hydroxyde solution in 1 ‐butanol. 相似文献
20.
Oxidation of 3‐furfurylcarbinols 3a‐e and 7 with bromine in acetone‐water solution gave the 2‐substituted‐3‐furfurals 4a‐e and 8 in good yields, respectively. Reaction of 2‐alkyl‐3‐furfurylcarbinols 9a and 9b with bromine in acetone‐water gave the bromoalkyl 3‐furfuryl ketones 10a and 10b as the major products. A reaction mechanism via the cis‐trans isomerization of the 2‐ene‐1,4‐diones 13 and 14 was proposed to account for the transposition of the alkyl group of the 3‐furfurylcarbinols 3, 7 and 9 to the 2‐position on the furan ring of the products 4, 8 and 10. 相似文献