Showing papers in "Journal of Heterocyclic Chemistry in 1992"

TL;DR: In this paper, a variety of 2,4-diaminothieno[2,3d]pyrimidines has been prepared through the reduction of the corresponding azido/tetrazolothienopyrimidine under acidic conditions.

TL;DR: In this article, the progress made in the constructing models for the biological activities of the ulapualides, lissoclinamides and leinamycin is summarized, along with the results of the experiments.

TL;DR: Improved, convenient, and reliable routes for the synthesis of 4-, 5-, 6-, and 7-azaindole, 7-methyl-4-additive, 7amino-4.

TL;DR: In this article, the 4-Chloro-3-nitro-2-quinolones were obtained from 4-hydroxy quinolones by nitration and chlorination, reacted with sodium azide to 4-azido derivatives 4 which cyclized on thermolysis to yield the furoxanes 5.

TL;DR: A series of [(4,5-disubstituted-4H-1,2,4-triazol-3-yl)thio]alkanoic acids 40−56 and their analogues 57−61 were synthesized for their possible antiinflammatory activities.

TL;DR: The orientation in the addition process can be determined by nmr measurements, especially by NOE difference spectroscopy, and the products do not correspond to a normal Skraup or Doebner-v. Miller synthesis.

TL;DR: In this article, an asymmetric synthesis starting from D- and L-phenylalanine was used to provide both enantiomers of 2-benzyl-6-(methoxycarbonyl)-2,3-dihydro-4H-bensopyran-4-ones.

TL;DR: In this article, 1-t-butyl-3,3-dinitroazetidine (1) with benzyl chloroformate resulted in a novel elimination of isobutylene to yield equimolar amounts of 1-(benzyloxycarbonyl)-3, 3-din-drugs (3) and 1 -tbutyl, 3,3dindioxetidine hydrochloride (4).

TL;DR: In this article, the tetrodotoxin ring system of Dynemicin A has been investigated for the synthesis of enediyne class antitumor antibiotics, and some simplified enediye compounds were designed for examination toward bicyclo[7.3.1]-tridecenediyne ring system.

TL;DR: The synthesis of 10 substituted 1,3,4-thiadiazolyl-4(3H)-quinazolinones 8,11, 13, 17, and 20,23 is reported in this paper.

TL;DR: A number of 5-aryl-2-(4-pyridyl)oxazoles, a 2-cycloalkano[d]oxazole, the related oxadiazole and furan, and many of their quaternary salts were prepared.

TL;DR: A photochromic spiroindolinonaphthoxazine derivative, 1,3,3-trimethyl-9'-hydroxy-spiro[indoline-2,3'(3H) naphtho[2,1-b][1,4]oxazine] 3 was synthesized by condensation of 1,2, 3,3tetramethylindolenium iodide 1 and 1-nitroso-2.7-dihydroxynaphthalene 2 as discussed by the authors.

TL;DR: In this article, the reaction of asymmetrically substituted β-diketones with hydroxylamine to give 3,5-diarylisoxazoles has been re-investigated, and has been found to occur with a low degree of site selectivity unless steric effects are operating.

TL;DR: In this article, the authors showed that polycyclic 1,4-dithiin derivatives can be synthesized by the reactions of dihalogenoheterocycles with thioamides, and they are useful as pigments and functional materials for electro-optical applications.

TL;DR: A ready, convenient synthesis for 8-cyano-7-ethoxy-4-oxo-9-phenyl-2-substituted-1,2,3,4-tetrahydropyrido[3',2':4,5]thieno[3,2-d]pyrimidines.

TL;DR: In this paper, reactions of substituted 1H-4,5-dihydroimidazolium salts with nucleophilic and electrophilic reducing agents acting via hydride transfer were explored.

TL;DR: In this paper, the optimal conditions for a regioselective acylation at the 6 position of the benzoxazolinone ring were presented, and a general method leading to the expected products in excellent yields was described.

TL;DR: In this paper, the authors used a transfer reaction with the corresponding tributyltin substituted heterocycles to synthesize bis(hetero-aryl) iodonium triflate salts.

TL;DR: In this paper, the anelation of quinoxalinone derivatives 3a-c and pyrido[2,3-b]pyrazinone derivatives 5a,c and 6a-, 6b,c was reported.

TL;DR: A general synthesis for the preparation of a series of N-bridgehead compounds: pyrroloimidazopyridine, pyrimidine and naphthyridine has been developed beginning with azidovinyl compounds with thermolytic or photochemical methods as discussed by the authors.

TL;DR: In this paper, photolysis of the N-arylmethyl-3-amino-1,2,4-triazoles 2-5 in methanol or water-methanol mixture, induces homolytic and heterolytic cleavage of the arylmethyl-C-N bond giving rise to 3-AMINO-1.4.

TL;DR: In this article, an original procedure to obtain substitution at the 7 or 5, 7 positions on 6-halogenated tetrahydroquinaldines is described, which is a new class of precursors of quinolone antibacterial agents.

TL;DR: In this article, a series of 3-alkyl-3,4-dihydro-2(1H)-quinazolinones was synthesized in three steps from isatoic anhydrides or an anthranilic acid.

TL;DR: In this article, the thermal properties and solubilities of octaalkylphthalocyanines and their copper complexes having long alkyl side chains of odd numbers of carbons (C 7,H 12, C 9 H 19, C 11 H 23 and C 13 H 27 ) were examined.

TL;DR: The condensation of iminoether 7, derived from pyroglutamic acid (4), with active methylene reagents such as Meldrum's acid or methyl cyanoacetate, lead to β-enaminoesters 2 as discussed by the authors.

TL;DR: In this paper, the title reaction was used to obtain 1,2,4,5-Tetrahydro-3,2-benzothiazepine 3,3-dioxides.

TL;DR: Benzoin condensation reactions of 2-thiophenecarboxaldehydes and furfurals have been reexamined with catalysts such as potassium cyanide, cyanide-resin, and a thiazolium salt.

TL;DR: Several triazole antifungal agents derived from mercaptomethylisoxazoles of general structure 2-(2,4- dihalogenophenyl)-3-((X-Isoxazolyl)methylthio)-1-(1,2, 4-triazol-1-yl)-2-propanol, as well as some selected sulfoxides and sulfones derived thereof, have been synthesized and tested for antIFungal activity as mentioned in this paper.