Výsledky vyhledávání - "Ioannis K. Stamos"

Pyrrolocarbazole analogs of aromatic skeleton of indolocarbazole natural products

Autor: Evaggelia S. Arsenou, L. Leondiadis, Manolis A. Fousteris, Anna I. Koutsourea, Ioannis K. Stamos, Sotiris S. Nikolaropoulos

Publikováno v: Journal of Heterocyclic Chemistry. 41:349-353

The synthesis of seven pyrrolo[2,3-a]carbazoles derivatives using Fischer indole cyclization conditions is described. Polyphosphoric acid trimethylsilyl ester was used as a mild catalyst for the cyclization step of intermediate arylhydrazones which w

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::081966b8c9b7af6208caaae0842f75e9
https://doi.org/10.1002/jhet.5570410307

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Tandem rearrangement involving a β-hydroxysulfoxide and cyclization processes toward the 1-benzenesulfonyl-5-benzenethio-1,2,2a,3,4,5-hexahydrobenz[c,d]indole oxygenated at the 4-position

Autor: Ioannis K. Stamos

Publikováno v: Journal of Heterocyclic Chemistry. 34:1487-1493

Treatment of compound 4 with trifluoroacetic anhydride under reflux in chlorobenzene underwent a tandem rearrangement to produce compound 5. When the acetylated derivative of 4, was treated with trifluoroacetic anhydride in the presence of Lewis acid

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a302e13c79d5e04c0972f6224f4bd64d
https://doi.org/10.1002/jhet.5570340518

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Synthesis and analysis of compounds having the skeleton of ergot alkaloids with the nitrogen atom in the D-ring transposed

Autor: John M. Cassady, Elyse A. Kelly, Heinz G. Floss, Ioannis K. Stamos

Publikováno v: Journal of Heterocyclic Chemistry. 32:1303-1308

Alkylation-amination of the enamine 2 in the presence of ethyl α,α-bis(dibromomethyl)acetate, triethyl-amine, and methylamine lead to the construction of the aza-transposed ergoline 3. Sequential reduction, hydrolysis, reesterification, and indoliz

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ffcd08a9503d5913d06e6fea35c284ec
https://doi.org/10.1002/jhet.5570320435

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The potential utility of homoacylation through the pummerer rearrangement-intermediates. A direct approach to the 1-benzene-sulfonyl-4-keto-8-methoxy-1,2,2a,3,4,5-hexahydrobenz-[cd]indoleviaintra-homoacylation

Autor: Heleni K. Kotzamani, Ioannis K. Stamos

Publikováno v: Journal of Heterocyclic Chemistry. 32:947-951

A convenient synthesis of tricyclic ketone 7 is described based on an intra-homoacylation via a Pummerer intermediate. The indole 3, was both annelated and functionalized for the next step through its protected indoline 4 using the single reagent dim

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f62e9f6f0c20cb535fc6cdef33f3bf73
https://doi.org/10.1002/jhet.5570320346

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Nuclear magnetic resonance spectral analysis of three isomeric 2,3,5-trisubstitutedN-methylpiperidines

Autor: Heleni K. Kotzamani, Ioannis K. Stamos

Publikováno v: Magnetic Resonance in Chemistry. 32:652-656

The 1H and 13C NMR spectra of three stereoisomeric 2-(p-chlorophenylthiomethyl)-3-(3-methoxyphenyl)-5-carbomethoxy-N-methylpiperidines were analysed in terms of configuration and solute conformation. These studies together with 2D J-resolved, 2D-COSY

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https://doi.org/10.1002/mrc.1260321104

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The Unility of the Pummerer Rearrangement Intermediates in the Presence of Lewis Acids—A Short and Practical Synthesis of 4-(2-Di-n-Propylaminoethyl)-7-methoxyindole

Autor: Christos G. Gourdoupis, Ioannis K. Stamos

Publikováno v: Synthetic Communications. 24:1137-1144

The interesting compound 5 was prepared by treatment of 3 with Ra-Ni and LiAlH4. In turn, 3, was obtained in high yield utilizing the trapping of a Pummerer intermediate, under mild Lewis acid conditions.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::367cf8a3ec12277be88c82ff0a7f4317
https://doi.org/10.1080/00397919408011709

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An approach to 1-alkyl-3-phenylpiperidine derivatives containing 2,5-functionalized groups: 1-methyl-2-(4-chlorophenylthiomethyl)-5-(methoxycarbonyl)- piperidine

Autor: Christos G. Gourdoupis, Heleni K. Kotzamani, Ioannis K. Stamos

Publikováno v: Tetrahedron. 50:10477-10482

Compound 6 was synthesized by regiospecific addition of 4-chlorothiophenol to diazoketone 5 in the presence of a rhodium (II) acetate catalyst. An annelation process pressumably proceeded via initial attack of methylamine on the bromoacrylic ester to

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::dbd5e6311ee12d93e593e37b90c03dc8
https://doi.org/10.1016/s0040-4020(01)89587-9

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A Direct and Versatile Synthesis of 5-(2-Di-n-Propylaminoethyl)-7-methoxyindole

Autor: Ioannis K. Stamos, Christos G. Gourdoupis

Publikováno v: Synthetic Communications. 23:2241-2249

The Pummerer intermediate generated from 10 with TFAA was trapped intermolecularly in the presence of Lewis acid by the indoline 2 at position 5. Sequential treatment of the resulted compound 3 with Ra-Ni, LiAlH4 and active MnO2 gave compound 6 in hi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1b54d747ca8166f3de86c0043af7c901
https://doi.org/10.1080/00397919308013780

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