Showing papers in "Journal of Heterocyclic Chemistry in 1971"

TL;DR: In this paper, the synthesis of 3-hydroxyisothiazole, 4-methyl-3-hydroxysothiazolin 3-ones, and a comprehensive series of the respective 2-substituted 4-isothiazoIin-3ones have been achieved by the one-step chlorination-cyclization of the corresponding 3,3 -dithiodipropionamides.

TL;DR: In this paper, a method for the preparation of esters and amides of thieno[2,3-d]pyrimidine-6-carb-oxylic acids was described.

TL;DR: The reaction of cinnamic acid derivatives with thionyl chloride and pyridine is a general procedure for the preparation of derivatives of 3-chlorobenzo[b] thiophene-2-carbonyl chloride from readily accessible starting materials.

TL;DR: In this paper, the electronic and steric factors influencing the rearrangement rates of methyl substituted imidazo [1,2-a]- pyrimidines are discussed, and a Dimroth-type rearranger is proposed.

TL;DR: Le principe de la cyclisation des isocyanates de vinyle, substitues par un groupement vinylidene appartenant a un heterocycle, a ete applique a la synthese de furo[3,2-c] pyridines is described in this paper.

TL;DR: In this paper, a diazirinium radical cation was observed to lose a nitrogen atom to give a nitrilium ion whose substitution pattern was dependent upon the original substituents in the nucleus.

TL;DR: In this article, the nitration of 2,3,4,5,tetrahydro-1H-3-benzazepine and its 3-methyl and 3-acetyl derivatives yields the corresponding 7-nitro derivatives which can be further transformed by classical procedures.

TL;DR: In this paper, a preparative method for 1-alkyl-1,4-dihydro-4-oxo-3-quinoline-carboxylic acids was developed.

TL;DR: The preparation and properties of four isomeric azadibenzoeycloheptenones 3 and their 10,11-dihydro derivatives 2 are described.

TL;DR: In this article, the high-yield synthesis of 2-trimcthylsilylbenzothiazole is described, and the labile nature of this silicon-helerocyclic bond is proved when cleavage is affected by aldehydes, acid halides, chloro-formates and anhydrides.

TL;DR: In this paper, the authors show that both diazepine derivatives rearranged to give isomeric isopropenylpyridoimidazol-ones, and the structures of these rearranged products were used to characterize the diazepines from which they were derived, according to a technique previously described.

TL;DR: The Schmidt reaction on 1.2,3,4-telrahydroquinolin-4-ones (1) gave 1.3,5,5-benzodiazepin-4 -ones (II) and 1,2, 3, 4-tetrahydroid-1,4 -benzoda-5)-ones(III).

TL;DR: In this paper, the reaction of m-chloroperbenzoic acid with the respective 4-isothiazolin-3-ones was shown to be successful in the oxidation of several 3-hydroxy isothiazoles to their respective I-oxides.

TL;DR: The photolysis of 1-(o-azidophenyl)-1H-indazole (IV) has been found to give a mix ture of 6-dehydroindazolo[1,2-a]benzolriazole(VI) and 2,2′-di(1indazolyl)azobenzene (VII) as mentioned in this paper.

TL;DR: In this paper, a model for interaction between a chemisorbed sulfur atom and the substrate molecule was proposed and the relative yields of the various products were rationalized in terms of a model based on the interaction.

TL;DR: In this paper, a trisubstituted hexahy drotriazines react with hydrogen chloride in the presence of anhydrous solvents to form useful intermediates for the introduction of the RNHCH2-group into compounds which undergo the Mannich reaction.

TL;DR: In this paper, the direct conversion of [1]benzothieno[3,2-b]pyridine (IVa), [2,3-b:4,5-b']dipyridine(Va), and [3, 2-b]: 4,5b]-diprinitrile (VIa) into their sulfoxides was effected by means of an equimolar quantity of iodobenzene dichloride in aqueous acetonitrile.

TL;DR: Substituted 1,2-benzothiazin-3-ones have been prepared by cyclization of 4,5-dimethoxy-2-carboethoxymethybenzenesulfonamides as mentioned in this paper.