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4,818 Newest Publications about the topic organic chemistry

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Synthesis of Pyrrolo[2',3':4,5]Furo[3,2-c]Pyridine-2-Carboxylic Acids

19-Feb-2004 | Mária Bencková, Alzbeta Krutošíková, Molecules Online, 2004

1H-Pyrrolo[2',3':4,5]furo[3,2-c]pyridine-2-carboxylic acid (6a) and its 1-methyl (6b) and 1-benzyl (6c) derivatives were synthesized. 3-(5-Methoxycarbonyl-4H-furo[3,2-b]-pyrrole-2-yl)propenoic acid (1) was converted to the corresponding azide 2, which in turn was cyclized to give 3 by heating ...

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Synthesis and Reactions of Some 2-Aminobenzothiazoles

19-Feb-2004 | Jarmila Štetinová, Rudolf Kada, Ján Leško, Molecules Online, 2004

N-(2-Benzothiazolyl)- and N-(6-methoxy-2-benzothiazolyl)cyanoacetamides 4, 5 resulted in the reaction of 2-aminobenzothiazole 1 or its 6-methoxy derivative 2 with 1-cyanoacetyl-3,5-dimethylpyrazole 3. Both cyanoacetylamides 4 and 5 have been transformed into the corresponding ...

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Synthesis and Theoretical Study of Mannich Type Reaction Products of 3-Formylchromones with Triazoles and Amides and Nucleophilic Formation of 2,3-Disubstituted-4-Chromanones

19-Feb-2004 | Henrieta Stankovicová, Walter M. F. Fabian, Margita Lácová, Molecules Online, 2004

The semiempirical PM3 method has been used to study possible reaction paths of the condensation of 3-formylchromones with amides and triazoles. Optimal geometries of intermediates 7, products 8 and all other putative reaction intermediates were obtained. Pertinent transition states, TS I for ...

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Effect of N-Methyl Substituents in 2-Methoxycarbonylphenylsulfamides on Kinetics and Mechanism of Formation of (1H)-2,1,3-Benzothiadiazin-4(3H)-One-2,2-Dioxides

19-Feb-2004 | Miloš Sedlák, Jaromír Kaválek, Vladimír Machácek, Vojeslav Šterba, Molecules Online, 2004

The cyclization reactions of N-methyl-N'-(2-methoxycarbonylphenyl)sulfamide (1a), N-methyl-N-(2-methoxycarbonylphenyl)-sulfamide (2a), and 2-methoxycarbonylphenylsulfamide (3a) were studied in aqueous amine buffers (butylamine, ethanolamine, morpholine, glycinamide). The dependences observed ...

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Nucleophilic Substitution on 4-Nitro- and 4-Methoxy-3-pyridinecarboxylic Acid-1-oxides

19-Feb-2004 | Svatava Voltrová, Viktor Prutianov, Molecules Online, 2004

1-Oxides of 4-nitro-3-pyridinecarboxylic acid (3) and methyl 4-methoxy-3-pyridinecarboxylate (5) were converted to 4-(diphenylmethyl)amino (7), 4-phenylthio (8), 4-phenylamino (9) and 4-(2-methylpropyl)-amino (6) derivatives by reaction with the corresponding nucleophiles. The 4-phenylamino ...

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Contraction of Substituted 3,7-Diphenyl-5,6-dihydro-4H-1,2-diazepines to 3,6-Diphenylpyridazine

19-Feb-2004 | Milan Potácek, David Vetchý, Eduard Novácek, Ivana Císarová, Jaroslav Podlaha, Molecules Online, 2004

P-Bromoacetophenone azine (1) in the reaction with carbanions from malononitrile and ethyl cyanoacetate under mild conditions afforded, instead of the expected double substituted derivatives of acetophenone, azine cyclic 5,5-disubstituted 3,7-diphenyl-5,6-dihydro-4H-1,2-diazepines (2a,b). ...

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Syntheses of Some New Five-Membered Heterocycles Containing Selenium and Tellurium

19-Feb-2004 | Jirí Šibor, Pavel Pazdera, Molecules Online, 2004

The syntheses of some new chalcogenazole 1 and chalcogenophene 2, 3 derivatives under conventional Gewald's conditions [1-4], by the action of ultrasound and focused microwave irradiation is reported. It was found that although ultrasound accelerated the described reaction significantly, the ...

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Protonation of 6a?4-Thia-1,6-diazapentalenes

19-Feb-2004 | Barbara Friedrich, Annett Fuchs, Mathias Findeisen, Bärbel Schulze, Molecules Online, 2004

The synthesis of the new thiadiazapentalenes 4a-e starting from isothiazolium salts with active 5-methyl and 5-methylene groups with dicyclohexylamine is described. The ring opening products of the protonation of thiazapentalene were examined by NMR-experiments. Content Type Journal ...

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