Showing papers in "Journal of Heterocyclic Chemistry in 1982"

TL;DR: In this paper, the relative amounts of isomeric mixtures obtained with asymmetric azoles or with equimolar mixtures of azoles are compared with literature results on monoalkylation of azole.

TL;DR: In this article, open-chain and cyclic sym-1,3-diones with N,N-dimethylformamide dimethyl acetal gave, generally in high yield, a series of sym-2-dimethylaminomethylene-1.3-Diones which reacted with phenylhydrazine and methylhydrazines to afford, generally, in satisfactory yield, 1,5-disubstituted 4-acylpyrazoles.

TL;DR: In this paper, the preparation of a series of macrocycles, formed by reaction of HO-(-CH2-CH 2-O-)nH with 1,10-phenanthroline-2,9-dicarbonyl chloride (n = 2,3,4) and 1,8-naphthyridine-2.7-dimethyl-1,8 naphthyrusidine 9 is described.

TL;DR: In this paper, a simple high yield synthesis of diphenyl cyanocarbonimidate is reported, which may be used to prepare functionalized benzimidazoles, benzoxazoles and triazoles in good yield under mild conditions.

TL;DR: The fluorescence intensity of 2-(3-Sulfonatopropyl)harmanium is practically pH-independent in the neutral pH-range, which makes them useful reference substances in measuring fluorescence intensities in physiological studies as mentioned in this paper.

TL;DR: In this paper, the reaction of N-cyanocarbonimidodithioic acid di(alkyl and aralkyl)esters with different alkyl-, aralky- and arylhydrazines to yield 1-substituted-3-R-thio-5-amino-1H-1,2,4-triazoles (3) and 2-substantive 3-R thio-4 triazole (4) was studied and the 3 (R = H) tautomer

TL;DR: In this article, room temperature treatment of 2-(3-arylureido)benzoic acids with concentrated sulfuric acid leads to N-substituted 2-amino-4H-3,l-benzoxazin-4-ones in generally very good yields.

TL;DR: In this article, a new method of amination of diazines and triazines, using potassium amide, liquid ammonia and potassium permanganate, has been described, which can be used to synthesize triazines.

TL;DR: In this paper, the synthesis of 2-mercaptobenzimidazole derivatives have been described while preparing such compounds, it has been observed that I reacts predominantly as the thione under anhydrous reaction conditions, and as thiol in the presence of an alkali Strutures of all the nine compounds have been established with the help of spectral methods including 13C nmr spectroscopy of the two compounds (II and III)

TL;DR: In this paper, a method for the synthesis of heterocylic systems related to 9,10-dihydroanthracene with two hetero-atoms at the 9, 10 positions is described.

TL;DR: In this article, a convenient and general preparation of 2-benzoxazolinones from 2-aminophenols with 1,1-carbonyldiimidazole is described.

TL;DR: In this article, 1-triphenylmethylimidazoles are treated with n-butyllithium in tetrahydrofuran at 0° to form the 2-lithio derivatives.

TL;DR: In this paper, isotopic substitution with either 13C or deuterium was used to identify bands with primarily v (C=O) and v(C =O) character in the spectra of 4-hydroxycoumarin and its anion.

TL;DR: In this paper, a new series of chiral macrocyclic polyether-diester ligands has been prepared from four chiral dimethyl substituted tetraethylene glycols (15a,b,16,17).

TL;DR: In this article, the reduction of 4,7-diphenyl-1,2,5-thia- (1a-i) and 1,2-5-oxadiazolo[3,4-c]pyridines (3a and c-e) gave 3, 4-diamino-2.5-dipsylpyridine (2a-g).

TL;DR: A number of C-acetyl heterocyclic compounds were condensed with isatin and substituted isatins to give a series of 3-hydroxy-3-substituted oxindoles as discussed by the authors.

TL;DR: In this paper, N-hetero-cyanoamino compounds were converted with N,N-dimethylformamide dimethyl acetal (DMFDMA) into the main products, such as N-Hetero-cycled N-methyl-s-triazolo[1,5-x]azines and O-methylhydroxylamine.

TL;DR: In this article, the nucleophilic reagents containing at least one primary amino group were used to yield a variety of 2-substituted and 2,4-disubstitized 4(3H)quinazolinones, including tricyclic and tetracyclic products.

TL;DR: Aldehydes react with 4-hydroxy-6-methyl-2-pyrone, 2, under Knoevenagel conditions to afford very elec-trophilic intermediates, which can be trapped by more 2 or thiols to give dilactones 3 or monolactones 4 as discussed by the authors.

TL;DR: In this paper, a one-step synthesis of N-methyl-2-aryl-4-quinolone alkaloids is described, which is readily prepared from the reaction of an n-methylisatoic anhydride with the lithium enolate of an acetophenone.

TL;DR: In this article, the structure of cyclic isomers 3 and 4 was studied by uv, ir and 1H-nmr spectroscopy, and their deuteration was investigated with 1Hnm rn-spectroscopy.

TL;DR: The parent framework of furo[2,3-c]pyridine has been synthesized as mentioned in this paper, where 3-Furoic acid chloride (2) was reduced with bis(triphenylphosphine) copper(1) tetrahydroborate to afford 3-furaldehyde (3) which was condensed with malonic acid to give β-(3-furyl)acrylic acid (4).

TL;DR: The 13C nmr spectra of 4 cis-2,4-diphenyl-3-azabicyclo[3.3.1]-nonan-9-ones, -9-ols or 9-yl acetates have been recorded as discussed by the authors.

TL;DR: The structure of two isomeric chloro(phenyl)furoxans is proposed by comparison of their 13C nmr spectra with those of several unsymmetrically substituted furoxANS and related furazans as mentioned in this paper.

TL;DR: This paper applied Fiesselman's condensation to α-hydroxymethylene nitriles and described a synthesis of substituted aminothiophenes, which they called amino-3 thiophens.

TL;DR: In this article, a generalized method for synthesizing a wide variety of heterocyclic aromatic amine derivatives from nitriles by use of hydroxide catalysts is presented.

TL;DR: In contrast to bromoacetone which gives a high yield of the imidazo[1,2-a]pyridine, bromobutanone also produces significant amounts of material derived from substitution on the exocyclic nitrogen atom as mentioned in this paper.

TL;DR: In this paper, the reaction of some imidazo[4,5-b]pyridine 4-oxides with phosphoryl chloride was described, which led to the predominant formation of 7-chloro derivatives.