Showing papers in "Journal of Heterocyclic Chemistry in 2005"

TL;DR: 3,4-Bis(3-nitrofurazan-4-yl)furoxan has been synthesized bynitration of C,N-bis(trimethylsilyl)derivative of 3-amino-4methylfurazan with nitrogenoxides as discussed by the authors.

TL;DR: In this article, 3-alkyl substituted 1-amino-1,2,3-triazolium cations (alkyl = methyl, ethyl, n-propyl, 2-propenyl, and n-butyl) have been synthesized and characterized by vibrational spectra, multinuclear NMR, elemental analysis, and DSC studies.

TL;DR: In this paper, a series of bis-pyrazolo[3,4-b:4′,3′-e]pyridines were synthesized in the reaction of 5-amino-3-methyl-1-phenylpyrazole with aldehydes under microwave irradiation and solvent-free conditions.

TL;DR: In this paper, Friedlander condensation of 5-aminopyrazole-4-carbaldehydes with α-methylene ketones such as acetone (4a) or acetophenones 4b-f with potassium hydroxide as basic catalyst yielded mixtures of isomeric pyrazolo[3,4-b]pyridine derivatives.

TL;DR: In this paper, the synthesis of symmetrical polyaromatic compounds with pyridine or diazine units has been achieved by homocoupling of aryl halides with Pd(OAc)2 as catalyst.

TL;DR: In this article, 2-aminobenzyl alcohol undergoes oxidative cyclization with aryl(alkyl), alkyl (alkyl) and cyclic ketones in dioxane at 80° in the presence of a catalytic amount of RhCl(PPh3)3 along with KOH to afford the corresponding quinolines in good yields.

TL;DR: Quinazolin-4(3H)-ones, 1,2-dihydroquinazolines, 3,4-dibidioxioxine compounds, imidazo[1,2]-quinazoline compounds, and 5,6-dimethylimidazo [1, 2-c]quinazolate compounds were synthesized by the reductive reaction of nitro group, N-H bond and ortho-ester, aldehydes or ketones promoted by the low-valent titanium reagent (TiCl4-

TL;DR: In this paper, reactions of 2,3-dihydro-4-oxo-thiopyrano[2,3b]pyridine with aldehydes and with DMF-DMA furnished the 3-benzylidene and 3-(N,N-dimethylamino)-methylene derivatives.

TL;DR: This paper showed that 3-Diethylaminoacrylonitrile reacts with hydrazonyl halides to yield 1,3-disubstituted pyrazole-4-carbonitriles 5a-d.

TL;DR: In this article, a Lewis acid (Zn[(L)proline]2) catalyst was used for one pot synthesis of Hantzsch 1,4-dihydropyridine (DHP) derivatives under solvent-free condition by conventional heating and microwave irradiation.

TL;DR: In this paper, a convenient synthesis of 2-mercapto and 2-chlorobenzothiazoles is described, where the key feature of the synthesis is an exclusive ortho-selective nucleophilic aromatic substitution reaction of Ortho-Haloanilines with potassium/sodium O-ethyl dithiocarbonate under mild conditions.

TL;DR: The 3-anilinoenones 3a,b were prepared from the corresponding 3-dimemyl-aminopropenones as discussed by the authors, and the reactivity of 3a and 3b towards a variety of carbon and nitrogen nucleophiles as well as naphthoquinones was reported.

TL;DR: In this paper, the reaction of ophenylenediamine with β-diketones or β-ketoesters in water formed 2-substituted benzimi-dazoles.

TL;DR: 3-Aminopyridazines were used as building blocks for the preparation of various types of functionalized, pyridazine ring containing compounds as mentioned in this paper, such as 3-amino-4H-pyrimido[1,2-b]pyridazin-4-ones.

TL;DR: In this article, a novel synthesis of (1H)-pyridin-2-one, pyrazolo[1,5-a]pyrimidine and isoxazole derivatives incorporating N-methylphthalimide moiety is reported.

TL;DR: In this paper, 4-Amino-6-methyl-3-(2H)-thioxo-5-(4H)-oxo-2-(2,3,4,5-tetra-O-acetyl-α-D-glucopyra-nosyl)-1,2,4-triazine (1) was condensed with 2-methyl (or phenyl)-4H-3,1-benzoxazin-4-one (5a,b) in boiling acetic acid to give compounds 8-

TL;DR: The 3-cyanochromone 3-oxide 4-oxo-4H1-benzopyran-3-yl moiety is referred to as Chr-X as discussed by the authors.

TL;DR: A series of alkyl l-heteroaryl-1H-1,2,3-triazole-4-carboxylates 6a-u were synthesised in four steps from methyl (Z)-2-benzyloxycarbonylarmino-3-(dimethylamino)prop-2-enoate and heterocyclic amines 2a-s to test against antimycobacterial activity.

TL;DR: In this article, a new series of 4-[3-alkyl(aryl)(heteroaryl)-5-hydroxy-5-trifluoromethyl-4,5-dihydro-1H-pyrazol-1-yl]-7-chloroquinolines, where [alkyl = CH3; aryl = C6H5, 4-CH3C6H4, 4-(FC6H 4, 4)-ClC

TL;DR: In this paper, a 2-Formyl-2-arylhydrazonoethanenitriles 6b-d was prepared via reacting enaminonitrile 2b,c with aromatic diazonium salts.

TL;DR: In this article, 12 novel compounds were synthesized by the [3+2] 1,3-dipolar cycloaddition reaction of 5,6-dehydronorcantharidin derivatives of substituted aromatic amines with nitrile oxides.

TL;DR: In this article, it was shown that the P4 pathway was used to synthesize 5-Phenyl-3-(trifluoromethyl)isoxazole (5-4d), 4-methyl-5-phenyloxazoles (11), and 5-methyl 4-oxazozoles (25) via photo-ring cleavage.

TL;DR: In this article, a simple method for the synthesis of 2-pyrazolines is described which occurs on silica surface under solvent-free conditions within 110-180 sec using microwave irradiation.

TL;DR: A new synthesis of a series of 3-amino-1H-quinazoline-2,4-diones is described, which involved the generation of the dianion of urea 7 and the subsequent intramolecular nucleophilic displacement of the 2-fluoro to form the quinazolinedione ring.

TL;DR: In this paper, ammonium fluoride was found as an efficient reagent for the synthesis of 1,2,4-oxadi-azoles of amidoximes under solvent free conditions using microwave irradiation.

TL;DR: A new series of anionic surfactants with dual type of activity antimicrobial and surface activity have been synthesized by reaction of 4H-3,1-benzoxazinone 3 and quinazolinethione 10 with nitrogen nucleophiles and activated olefinic compounds.

TL;DR: In this article, a series of flavazoles 3a-1 were synthesized via dehydrative cyclization of a new series of 3-[(α-arylhydrazono)-aroylmethyl]quinoxalin-2(1H)-ones 2α-1 and their biological activity has been evaluated.