Showing papers in "Journal of Heterocyclic Chemistry in 1977"

TL;DR: In this article, masked β-ketoaldehydes were used to synthesize pyrazoles or isoxazoles, which can react with hydrazine hydrate or hydroxylamine at room temperature to give good yields.

TL;DR: In this paper, three homologous cofacial diporphyrins that have interplanar distances ranging from 6.4A to 4.2A have been synthesized and their absorption and emission spectra revealed strong exciton coupling in the diporphrin.

TL;DR: The pyrazolo[1,5-c]-as-triazine derivatives 4c-e could be prepared via condensation of 2a with potassium cyanide.

TL;DR: Indole-3-carboxylic acid and its derivatives are readily prepared from indoles (including oxindoles) and phosgene (oxalyl chloride), respectively and the interaction of these reagents with the indole Grignard reagent afforded several products including the cyclo-tetramers.

TL;DR: In this article, a number of 5,5′-disubstituted 2,2′-bipyridines and their derivatives have been described, including the benzidine analogue and its derivatives.

TL;DR: In view of the preparation of heterocyclic polymethine dyes, 2-(methylpyridyl or quinolyl)-benz-X-azoles were synthesized with the general reaction between carboxylic acids and o-bifunctional compounds as discussed by the authors.

TL;DR: In this paper, a number of substituted 2H-pyrazolo[3,4-d]pyridazines, pyridazin-7(6H)ones, and -pyride-azine-4,7(5H, 6H)diones have been prepared from the 3, 4-diacyl-, 3-carbethoxy-4-acyl, 3- carbethoxy 4-cyano-, and 3,4dicarbethoxy -pyrazole derivatives and hydrazine hydrate.

TL;DR: Arylazo group decoupling from 3,5-diamino-4-arylazopyrazoles (1a-c) by the action of acetic acid-sulfuric acid mixture was discussed in this article.

TL;DR: On etudie la reactivite du N-methylindole vis-a-vis de plusieurs diarylnitrilimines as discussed by the authors, and en accord avec les donnees analytiques and spectrales.

TL;DR: In this paper, the carbocyclic analogs of cytosine nucleosides in which the pentose moiety of the nucleoside is replaced by a cyclopentane ring were disclosed.

TL;DR: In this paper, the reaction of isatoic anhydrides with different primary aromatic amines to give several new N-aryl-o-aminobenzamides was described.

TL;DR: The pyrolysis of antipyrine 4dizaonium flouroborate gave an antipyrylazopyrazopyrazolone instead of the desired 4-fluoroantipyrine as mentioned in this paper.

TL;DR: In this paper, a 2-deoxy analog of antileukemic ψ-isocytidine and also a C-nucleoside analog of deoxycytidine, was synthesized from ψuridine by making use of the newly discovered pyrimidine to pyridine transformation reaction.

TL;DR: A new class of dimeric porphyrin ligands and their metal complexes have been prepared by an unambiguous and high-yield synthetic scheme as mentioned in this paper, which is used in this paper.

TL;DR: In this paper, the synthesis of 1,3,5,7,triazaphosphocine and 1,7-triaza-5-phosphabicyclo[3.3.1]nonane derivatives via nitration, nitrosation and acetylation was reported, and a comparison of the reactions of the triazaphosphaadamantane with the analogous reactions of hexamine was made.

TL;DR: In this paper, the synthesis of 1-azaphenoxathiin, the parent ring system of a recently reported class of novel CNS agents, is described and the 13C-nmr spectrum and its assignment are also reported as a model for structure confirmation studies.

TL;DR: A refined, rapid procedure for the preparation of normorphine and norcodeine in 80-90% yields is described in this paper, where the procedure is based on the procedure described in this paper.

TL;DR: In this article, the trimethylsilyl derivative of 4,6-dichloroimidazo[4,5-c]pyridine with 2,3,5tri-O-benzoyl-D-ribofuranosyl bromide gave four nucleosides-the α- and β-anomers of the 1-isomer and the α-and β -anomer of the 3-isome (3.9:2).

TL;DR: In this article, the mass and nmr spectra of the mentioned compounds were studied and the properties of the corresponding derivatives were analyzed, including benzimidazole, benzoxazole and benzothiazole derivatives.

TL;DR: A facile route for the synthesis of substituted 2-amino-3-cyano-4-methylpyrroles from N-acetyl-α -amino ketones and malononitrile is reported in this paper.

TL;DR: In this article, complete Carbon-13 magnetic resonance spectral assignments of cocaine and atropine were made, and the carbon-13 NMR spectra provided an interesting example of long range coupling on chemical shifts.

TL;DR: In this paper, the authors derived ambident-anions derived from 2-and 4-pyridones by phase transfer catalysis, achieving 80% of substitution and 20% of O-substitution.

TL;DR: In this paper, the synthesis of four dialkyl and three eyeloalkyl analogs of psilocin (4, R - CH3), a hallucinogenic principle found in certain fungi, is described.

TL;DR: A series of novel macrocyclic multidentate crown compounds have been prepared from a series of dioxodioic acids by treating various oligoethylene glycols or amines with maleic, succinic, citraconic, and glutaric anhydrides.

TL;DR: The utility of this reaction is exemplified by the facile two-step conversion of pseudouridine into the anlileukemic agent, pseudoisocytidine, in good overall yield.

TL;DR: In this paper, the synthesis of novel imidazo[4,5-c]pyridines 11-13 and imidazospyridis 18-20 was described using 2 as the starting material.

TL;DR: 3-Dcazacytosine (4-amino-2-pyridone, 3), 3-doazauracil (4hydroxy-1-β-D-ribo-furanosyl-2 pyridonc, 9), and 3-deazauridine ( 4-hydroxy 1β-d-ribofuranose, 11) were prepared in high overall yields from 1-methoxy-1buten-3-yne (1) as mentioned in this paper.

TL;DR: In this article, the disodium salt of 2-mercapto-3-pyridinol with various ortho-nitrohalo-benzenes to yield a group of previously unreported 1-azaphenoxathiins is described.

TL;DR: In this article, the 2-amino-2-thiazolines were shown to yield 4-substituted 2-Amino-5,6-dihydro-4H-1,3-thizines (2; R3 = H) and 2-phenylimino compound 10 on exposure to trifluoroacetic acid or triffluoro acetic acid-stannic chloride.

TL;DR: In this article, a Diels-Alder addition of benzyne to N-trimethylsilylpyrrole was described, which protected the product from secondary benzynes reactions and was easily removed.