Showing papers in "Journal of Heterocyclic Chemistry in 2000"

TL;DR: A growing number of products, including many heterocycles, can be prepared by the one-pot MultiComponent Reactions (MCRs) just by mixing three or more educts, and in many cases practically quantitative yields of pure products can be obtained as mentioned in this paper.

TL;DR: The synthesis of block and alternating thiophene/phenylene co-oligomers that is based either on the Suzuki coupling reaction or on the Grignard reaction was reported in this article.

TL;DR: In this article, the synthesis of phenyl-capped oligothiophenes via improved synthetic schemes was reported. These schemes are based on the Grignard coupling reaction and enable them to obtain the target compounds at high yields.

TL;DR: In this article, the 4-trifluoromethyl substituted compound has a significantly greater Stokes shift than the comparable compound lacking this group, but both the new coumarins have low fluorescence quantum yields (ϕf).

TL;DR: In this paper, a series of 1,4,5,6,7,8-hexahydroquinolines (9a-j) has been synthesized and their structural features studied by X-ray analysis and theoretical calculations at semi-empirical and ab initio levels.

TL;DR: In this paper, 1.3-dipolar cycloadditions of 1-propargyl-benzotriazol-1-ylmethyl moiety was further elaborated by sequential lithiation and reaction with aldehydes, alkyl halides and Michael acceptors.

TL;DR: In this paper, a set of new N-heterocyclic compounds which are derivatives of 1,10-phenanthroline were described, which could function as tri-, tetra- or hexadentate ligands with transition metal ions.

TL;DR: In this article, 8 new 2-methyl-4(3H)-quinazolinones with one or two chlorine atoms in the benzene ring and a 5-methyl 1,3-thiazol-2-yl substituent in position 3 of the heterocyclic ring were synthesized.

TL;DR: In this article, a semi-synthetic method of (S)-7-(2-isopropylamino)ethylcamptothecin hydrochloride has been developed, based on the Mannich reaction.

TL;DR: In this article, a new method for preparation of quindoline 2 and its O and S analogs was presented, which represents a new way of preparation of the quinoline.

TL;DR: 2,7-Diazapyrene was synthesized in three high-yield steps from commercially available 1,4,5,8-naphthalene tetracarboxylic diimide.

TL;DR: In this article, a series of m-and p-substituted 1-phenyl, 1-benzyl and 1-(2-phenylethyl) pyrroles was prepared and their 1H and 13C nmr spectroscopic characteristics were examined.

TL;DR: In this paper, the synthesis and reactions of 2-hetero-4H-3,1-benzoxazin-4-ones which include oxygen, sulfur and nitrogen substituents are reviewed.

TL;DR: An improved synthesis for the preparation of 3-oxo-1,2,5-thiadiazolidine 1,1-dioxides has been developed and results in excellent yields of products.

TL;DR: In this article, the reactions of 4-bromoacetyl-3-methoxy-3methoxyl-6,6-diphenyl-4-[3-(5-alkyl[1,2,4]triazolo[3,4-b]-2,3-dihydro-6H-[1,3, 4]thiadiazinyl)]-1, 2-dioxane in moderate yields (43-46%) were reported.

TL;DR: In this article, a study of the regiochemistry of cyclo-condensation reaction of s-alkoxyvinyl trihalomethyl ketones with an unsymmetric dinucleophile N-methyl thiourea is presented.

TL;DR: The rationalization of the synthesis of substituted analogs of megazol, a biologically active 5-nitroimidazole at position 4 of the imidazoles ring, had led to the study of intermediate steps, which revealed that hard nucleophiles on this compound 2 react only with the halogen at the 2 position.

TL;DR: Condensation of 1-arylhydrazono-1-benzotriazol-1yl 2-propanones (5a-c) with DMF DMA afforded 1-yl-1,4-dihydropyridazine-4-ones as mentioned in this paper.

TL;DR: The intramolecular Knoevenagel condensation of N-cyclohexyl 3-aryl-2-(2-nitrophenyl)acetoxy-3-oxopropionamides as discussed by the authors obtained from arylglyoxals 2 and cyclohexynyl isocyanide (3) afforded N-Cyclehexyl (Z)-3-aryl -2-hydroxy-3-(2,3-dihydro-2-oxoindol-3 -ylidene)propionamide 8 probably via

TL;DR: A review of studies toward the enantioselective total synthesis of ircinal A, manzamine A and related compounds is presented in detail in this paper, where a review of their work is presented.

TL;DR: In this article, the molecular geometries and the torsional potentials about the inter-ring C-C bond in α-oligothiophenes (α-nTh, n=2-4) have been calculated by means of conventional ab initio and density functional theory (DFT) calculations employing the hybrid B3LYP and BH&HLYP functionals.

TL;DR: In this paper, the mechanism of thiadiazoles formation from both starting classes of compounds, thiobenzamides and N-substituted thiourea, is collected and discussed.

TL;DR: In this paper, the ring system pyrrolo[3,4-e][1,2,3] triazolo[1,5-a]pyrimidine 6 was obtained in one step by reaction of 3-azidopyrrole 3 and substituted acetonitriles.

TL;DR: In this article, the authors introduce the concept of recyclization tandems: mesoionic system may be easily transformed to highly reactive oxazolo[3,2-a]pyridinium cation which, in turn, undergoes variety of ring opening/transformation reactions leading to novel classes and subclasses of heterocyclic compounds.

TL;DR: In this article, the condensation of α,β-unsaturated ketones with substituted o-aminothiophenols, obtained by reductive cleavage of the corresponding disulfides in the presence of triphenylphosphine, is an effective method for the synthesis of 2,4-diaryl-2,3-dihydro-1,5-benzothiazepines under neutral conditions.