Showing papers in "Journal of Heterocyclic Chemistry in 1996"

TL;DR: The cornucopia of porhyrinoid macrocycles that emerged from the Cologne laboratory over the last decade is reviewed in this paper, where a symbiotic link between annulene and porphyrin chemistry is discussed.

TL;DR: In this paper, the fusion of the indole and quinoline rings of C. sanguinolenta has been studied and two new indoloquinoline alkaloids are reported, one an angular indolo[3, 2-c]quinoline system and the other a linear indolo [2, 3-b] system.

TL;DR: In this article, the synthesis of fourteen mono-cationic and six dicationic analogs of Hoechst 33258 is described, starting from 4-acetamidobenzonitrile.

TL;DR: In this article, the planar structures and intra-and inter-molecular hydrogen bonding necessary to confer on the materials the high density, the thermal and chemical stability, and the explosive insensitivity required for new insensitive energetic materials.

TL;DR: In this paper, the 3-aryl-5-hydroxy 5-trihalomethylisoxazoles 5,6a-g was obtained by cyclocondesation with hydroxylamine hydrochloride in the presence of an excess of concentrated hydrochloric acid.

TL;DR: Cryptomisrine as discussed by the authors is a novel indolo[3,2-b]quinoline dimeric alkaloid obtained from extracts of the roots of the Ghanaian medicinal plant Cryptolepis sanguinolenta.

TL;DR: In this article, the title compounds 6 have been prepared from the corresponding 4-aryl substituted 5-alkoxycarbonyl-6-methyl-3,4-dihydropyridones 4 in good yields.

TL;DR: In this article, a one-pot synthesis of various 2H-pyran-2-one derivatives starting from methyl ketones and acetic anhydride is described.

TL;DR: In this article, a number of 5H-Benzo[b]naphtho[2,3d]pyrrole-6,11-dione derivatives were synthesized.

TL;DR: In this article, the use of benzenesulfonyl substituted furoxans as flexible intermediates for the synthesis of new functionalized furoaxans interesting for their potential biological properties is discussed.

TL;DR: A review of the studies of inverse electron demand Diels-Alder reactions of heteroaromatic and acyclic azadienes is presented and the application of a N-sulfonyl-1-aza-1,3-butadiene [4+2] cycloaddition reaction in the total synthesis of natural and ent-fredericamycin A is described in detail as mentioned in this paper.

TL;DR: In this article, 1-Alkyl-5-halo-4-methoxypyridazin-6-ones were synthesized from 1-alkyl-4,5-dihalopyrithmoyl-polymorphic-polycyclic-cyclic polycyclic (PCP) compounds.

TL;DR: In this article, the coumarins are screened for antiinflammatory activity in vivo using the carrageenin rat paw edema and in vitro through their antiproteolytic activity and their ability to inhibit β-glucuronidase and 12-Lipoxygenase.

TL;DR: In this paper, the structures of thiophene, pyrrole, furan, and their benzo derivatives were generated with the hybrid B3LYP density functional theory (DFT) methods employing a 6-31G* basis set.

TL;DR: In this paper, an efficient procedure for the preparation of 1,2,4-triazin-5-ylcarbaldehyde oximes 2a-f from 1, 2, 4-triazines 1a-c and nitromethide ion is described.

TL;DR: In this paper, the effect of the cyclopentane ring on the regiochemistry of 2-acetylcyclopentanones 1a-d and β-methoxyvinyl trifluoromethyl ketone derivative 2a with hydroxylamine hydrochloride was investigated.

TL;DR: In this article, a one-pot procedure for synthesizing 3-Aroyl-4-hydroxy-2-quinolones is presented, in which the esters do not need to be isolated.

TL;DR: In this article, substituted pyrido[2,3-d]pyrimidines 5 and 6 have been prepared in one-step from the readily available 6-amino2,4-dioxotetetrahydropyrimidine (1) or 6amino-4-oxo-2-thioxOTeteteter-drugs (2) substituted Meldrum's acid.

TL;DR: In this article, the reaction of ethoxydihydropyrans, which were prepared from 2-methylene-1,3-dicarbonyl compounds with ethyl vinyl ether, and hydroxylamine hydrochloride gave 4-cyanoethylisoxazoles, whose substituents at the 3 and 5 positions were transformed from substituent at the 2 position and the acyl group of 2 regioselectively.

TL;DR: Two simplified analogs of the dimeric naphthalenyltetrahydroisoquinoline alkaloid michellamine B inhibited recombinant HIV reverse transcriptase and inhibited the phosphorylation of histories by rat brain protein kinase C.

TL;DR: In this article, a series of quinoline-based dienophiles containing an activating group (e.g. 4, Scheme 1) reacted with acyclic dienes in a Diels-Alder fashion under increased pressure to afford a variety of heterocyclic systems related to the CDE skeleton of dynemycin A.

TL;DR: A series of novel compounds of α,α'-bis(arninomethyl)oligothiophenes and their related compounds whose degree of polymerization spans two (dimer) to five (pentamer) were synthesized and characterized in this article.

TL;DR: A review of the literature on the synthesis and properties of the steroidal oxazoles, oxazolines, and oxazolidines can be found in this article, in which the literature published up to the end of 1994 is systematized.

TL;DR: In this paper, a mechanism for the aromatization step with thionyl chloride is proposed, based on the results of the Hurd-Mori reaction in the key step, which yields the fully aromatic products, instead of the expected annelated 4,5-dihydro[1,2,3]thiadiazoles.

TL;DR: Novel 1H-pyrazolo[3, 4-b]quinoxalines (flavazoles) 14, 15 and 1-aryl-3-quinoxalinyl-1,2,4-triazole 17 were synthesized from the ester 11 via various hydrazones 12, 13 and 16.

TL;DR: Several thieno[2,3-b]quinolines 6a-i have been synthesized as mentioned in this paper and these compounds were used as key intermediates in the synthesis of oxazino[4′,5′:4,5]thienoline 8, pyrimido[4',5',6',7]-thienolines 9, triazino [4',6,7]-quinolines 10, and imidazo

TL;DR: In this paper, four heptamethine cyanine dyes with an ortho-hydroxy-carboxy functionality for metal ion complexation and absorbing at λ max (methanol) 761±1 nm have been synthesized.