Showing papers in "Journal of Heterocyclic Chemistry in 1968"

TL;DR: In this paper, the synthesis of various picrylamino-and nitro-substituted furazans and bifurazanyls is described, except for 3,4-bis(picrylaminofurazan), which was obtained by nitrating 3, 4-dianilinofuran.

TL;DR: The role of atmospheric oxygen in the condensation of pyrrole and benzaldehyde to ms-tetraphenylporphin in acidic media was studied in this article, where the effects of acidity, solvent, concentration, and other constraints on both the rate and yield of the reaction were investigated.

TL;DR: In this article, the Knorr-Paal condensation was used to synthesize moderately to severely sterically-crowded 1,2,5-trisubstituted pyrroles.

TL;DR: In this paper, a study of the preparation of perimidines from 1,8-diaminonaphthalene and carbonyl compounds is presented, and the optimum conditions for the reaction of the above diamine with carboxylic acids and esters, acid chlorides, anhydrides and aldehydes are defined.

TL;DR: The syntheses of flavinyl peptides, in which L-tryptophan, L-tyrosine, or L-phenylalanine are attached via peptide linkage to the isoalloxazine system with ω-carboxyalkyl groups in position 3 or 10, are described, indicating that different types of intramolecular interactions are involved.

TL;DR: The synthesis of 2-chloro-1-(β-D-ribofuranosyl)benzimidazole (4b) has been accomplished by a condensation of 2chloro with 2,3,5-tri-O-acetyl-Dribofurananosyl bromide (2) followed by subsequent deacetylation.

TL;DR: In this article, certain derivatives of diazines containing the ferroin (NCCN) group have been prepared for chelation with metal ions, with the idea of providing new compounds capable of chelation.

TL;DR: In this article, the synthesis of various picryl-and picrylamino-substituted 1,2,4-triazoles and 3,3′-bi-1, 2,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28

TL;DR: The thiosemicarbazones and other derivatives of phthalonimides of possible biological interest (as potential antibacterial, antiviral, or immunosuppressive agents) have been synthesized.

TL;DR: In this paper, the 4-thiouracil structure was found to form adducts with enamines, which, on treatment with primary amines or ammonia, undergo apparent "amine exchange" and cyclization to 4th-thioracil derivatives.

TL;DR: In this paper, the introduction of more diversified substituents into the s-triazolo[4, 3-a] pyrazine and s-Triazolo [4,3a]quinoxaline systems has been accomplished and some reactions and spectral characteristics of these ring systems are reported.

TL;DR: In this paper, the azide structure of 6-hydrazinotetrazolo[1,5b] pyridazine (II) was confirmed from spectroscopic data and from its conversion into 6-amino-s-triazolo [4,3b]pyridine (VIII), obtained in another experiment from VII.

TL;DR: A facile, general synthesis for a number of 5-substituted 1-methyluracils and cytosine which is suitable for the preparation of microquantities is reported in this paper.

TL;DR: In this paper, an improved and straightforward synthesis of (±)-coclaurine (Va), isococlaurine(Vb), and reticuline (VIIIa) is described.

TL;DR: The reaction of cuprous acetylides with aryl halides bearing a nucleophilic ortho substituent provides a versatile route to heterocyclic substances.

TL;DR: In this article, synthesis and infrared and nuclear magnetic resonance spectral data for the six mononitrobenzo[b] thiophenes have been described, including the 2-and 3-isomers.

TL;DR: In this article, the action of bases on 3-aryl (or alkyl)-5-acyl-2-isoxazolines has been shown to give rise to the corresponding aromatic nitriles and α-diketones by cleavage of O-N and C3C4 bonds of the heterocyclic ring.

TL;DR: In this paper, the ring closure of 2-phenylmercapto-1-tetralone was used to synthesize naphtho[2,1-b]benzothiophene, followed by dehydrogenation of the resulting dihydro derivative.

TL;DR: In this article, the fragmentation patterns obtained upon electron impact on 2-nitro-, 2-chloro, and 2-aminopyridines, as well as those of the corresponding 3-, 4-, 5- and 6-picolines were examined.

TL;DR: In this article, the spectral properties of the 5-acetylthieno [2,3-b] pyridine system were reported. But the spectral data were not available for the 4-amino and 5-bromo isomers.

TL;DR: In this article, the general method of Meerwein was used for the preparation of aminobenzophenones by diazotization followed by reaction with sulphur dioxide in the presence of Cu+ according to the general principle of Cu+, according to which the sulfonyl chlorides with hydrazine led to 4-phenyl-2H-1,2,3-benzothiadiazine and 1,1-dioxides (II).

TL;DR: In this paper, 1,4-dimethyldibenzothiophene (VII) was synthesized and was converted with butyl dichloromethyl ether to the 2-aldehyde (VIII).