Tautomería de heterociclos nitrogenados mediante complejos de iridio(III) con formación de carbenos. N-heterocíclicos. Ana Rita Guerreiro De Brito Petronilho. – Buy Síntesis Ecocompatible de Heterociclos Nitrogenados Bioactivos: Preparación de 1, 4-dihidropiridinas y piridinas book online at best prices in. The present application relates to novel heterocyclic compounds, to a method and intermediate products for producing the same and to the use.
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Perkin I, To achieve this goal, we recalled a modification of B-N reaction for b-arylethylisocyanates. Japan, 47 Properties and SynthesisAcademic Press: The residue was recrystallized with EtOH: An attempt was made to synthesize conformationally restricted nitrogen heterocycles by means of the Bischler-Napieralski reaction and Tsuda modification. C 13 H 17 NO 3 requires C, All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License.
C 14 H 19 NO 3 requires C, Nevertheless, in it was documented that tricyclic amines 6 and 7 Figure 3 were readily prepared by lithium aluminium hydride reduction of the corresponding lactams, 3 synthesized in turn from the appropriate tricyclic ketones by Beckman rearrangement of the corresponding oxime or by Schmidt reaction. To a solution of 13 1 g, 4. Thus, in both compounds the 5-membered ring is almost planar and lies in the plane nitrogenadoe the benzene ring; C-1 should also lie in this plane, as well as C-3a.
C 20 Heherociclos 23 NO 3 requires C, To a solution of 13 mg, 1. Solvents and reagents were purified using standard procedures.
Roquefortina C – Wikipedia, la enciclopedia libre
Acta, CA Esta metodologia foi adotada, por ex. Apparently, these systems are only heteorciclos with good yields from 1,7-disubstituted-indanes or by using concerted intramolecular rearrangements.
Our successful preparation of isoquinolines 7 using ethylpolyphosphate EPP in the Bischler-Napieralsky B-N synthesis encouraged us to prepare compounds 3 and 4 using this classic reaction Scheme 1. In the modification proposed by Tsuda, 9 the reaction seems to proceed by initial activation of the isocyanate to an activated species sp 2 see Scheme 2.
Rio de Janeiro, Melting points uncorrected were obtained on a Thomas Hoover apparatus.
Equilíbrio ceto-enol em heterociclos nitrogenados | Gastmans | Eclética Química Journal
Nova28 However, it cannot be ruled out that steric hindrance exerted by o -methoxy-group leads to the failure of the cyclization step. Quite likely, this peculiar stereochemical configuration could be obtained more easily from structure 9 rather than from 5.
Accordingly, our research was focused on the synthesis of compounds 3 and 4 Neterociclos 1. C 13 H 15 NO 3 requires C, hetrociclos N -Benzoyl 5,6-Dimethoxyindanyl ethylamine 17 To a solution of the amine nitrogenads mg, 2. In the B-N reaction this intermediary is a nitrilium ion sp 10 see Scheme 3.
The excess of the reactive was removed in vacuo and the residue dissolved in CH 2 Cl 2 10 ml. Sakane et al 4 resorted to a similar synthesis proposed by Rapoport and co-workers 5 to prepare 7-carboxyindanacetic acid 8 Figure 4.
N -Acetyl 5,6-Dimethoxyindanyl ethylamine 16 To a solution of the amine 15 mg, 2. Therefore, by comparing these results with those observed by Flack and Lions, 2 it is suggested that electronic factors, such as electron releasing groups in the benzenoid moiety, are not strong enough to achieve cyclization in these mild conditions. Our attention was then focused on common and uncommon structural features in 5 2 and 9 4 compounds.
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May 7, – Accepted: To a solution of the amine 15 mg, 2. To a solution of 5,6-dimethoxyindanyl methylamine 8 0. How to cite this article. Results achieved seem to indicate that neither the classic B-N Scheme 1 reaction nor the modification proposed by Tsuda Scheme 2 are adequate for the synthesis of these tricyclic amines. In fact, 1,2,3-triazoles show several applications in many areas especially as medicines against many diseases like cancer, AIDS, Parkinson and Alzheimer.
This result is comparable to the one obtained by Flack and Lions 2 heerociclos strong cyclodehydrating agents on amides in reactions mediated by the nitrilium ion. Nevertheless, there is no article that gives an objective overview of the synthetic methods for obtaining these kinds of azoheterocycles. Finally, acetyl and benzoyl derivatives 16 and 17 were obtained. Finally, this paper also provides a brief overview on pharmacological applications of some 1,2,3-triazoles.
C 15 H 21 NO heterrociclos requires C, Acta64 Triazoles1,2,4 ; Weissberger, A. The organic phase was washed with H 2 O, dried MgSO 4 and concentrated in vacuo to render the isocyanate which, without further purification, was treated with phosphorous oxychloride 6.
Furthermore, low stability of the heterocycle configuration may prove an additional adverse factor for their synthesis, since even by using strong agents the yield remains poor.
New York,p. Em The Chemistry of Heterocyclic Compounds: The mixture was filtered through Celite and the filtrate extracted with CHCl 3 3×50 ml.
Na Figura 2 destacamos os membros mais simples da classe 5,6: Acid 13 was converted, via its halide, to 14 which was reduced to 15 using lithium aluminium hydride and used in the following step without purification.
A solution nitrogenqdos the ester 12 8 1g, 3.