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Molecules, Volume 2, Issue 2 (February 1997) – 5 articles , Pages 31-56

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42 KiB  
Article
Synthesis and 1,3-Dipolar Cycloaddition Reactions of Chiral Maleimides
by Vladimir Ondrus and Lubor Fisera
Molecules 1997, 2(2), 49-56; https://doi.org/10.3390/feb97p5 - 25 Feb 1997
Cited by 11 | Viewed by 8831
Abstract
New routes to the synthesis of various novel chiral maleimides are described. The oxabicyclic anhydride 2 readily available exo-Diels-Alder adduct of furan and maleic anhydride was used as a vehicle, which in turn reacted with hydrochlorides of amino acids 3a-f in the presence [...] Read more.
New routes to the synthesis of various novel chiral maleimides are described. The oxabicyclic anhydride 2 readily available exo-Diels-Alder adduct of furan and maleic anhydride was used as a vehicle, which in turn reacted with hydrochlorides of amino acids 3a-f in the presence of Et3N with release of furan to give the requisite novel chiral imides 4a-f in good to moderate yields. The stereoselectivity of 1,3-dipolar cycloaddition of nitrile oxides with prepared chiral imides 4a-f is investigated. Full article
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15 KiB  
Communication
Synthesis of 1,2,3,6-Tetrahydrophosphinine 1-Oxides by Regioselective Reduction of 1,2-Dihydrophosphinine 1-Oxides
by György Keglevich, Kálmán Újszászy, Krisztina Ludányi, Áron Szöllôsy and László Tôke
Molecules 1997, 2(2), 46-48; https://doi.org/10.3390/feb97p4 - 25 Feb 1997
Cited by 4 | Viewed by 5763
Abstract
Synthesis of 1,2,3,6-tetrahydrophosphinine 1-oxides by regioselective reduction of 1,2-dihydrophosphinine 1-oxides was reported in this communication. Full article
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15 KiB  
Communication
Synthesis of 1,2,3,4,5,6-Hexahydrophosphinine 1-Oxides by Catalytic Hydrogenation of 3-Phosphabicyclo[3.1.0]hexane 3-Oxides
by György Keglevich, Antal Tungler, Kálmán Újszászy, Tibor Novák and László Tôke
Molecules 1997, 2(2), 43-45; https://doi.org/10.3390/feb97p3 - 25 Feb 1997
Viewed by 5548
Abstract
Synthesis of 1,2,3,4,5,6-hexahydrophosphinine 1-oxides by catalytic hydrogenation of 3-phosphabicyclo[3.1.0]hexane 3-oxides was reported in this communication. Full article
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56 KiB  
Article
New Anticandidous 2-Alkylthio-6-aminobenzothiazoles
by Eva Sidóová, Dusan Loos, Helena Bujdáková and Jana Kallová
Molecules 1997, 2(2), 36-42; https://doi.org/10.3390/feb97p2 - 25 Feb 1997
Cited by 28 | Viewed by 6632
Abstract
The synthesis and antimicrobial activity of six new 2-alkenyl-6-aminobenzothiazoles are reported. The new compounds were prepared by alkenylation of the potassium salt of 6-amino-2-mercaptobenzothiazole with alkenyl bromides. The structure of the compounds was verified by 1H NMR spectra. The compounds have shown [...] Read more.
The synthesis and antimicrobial activity of six new 2-alkenyl-6-aminobenzothiazoles are reported. The new compounds were prepared by alkenylation of the potassium salt of 6-amino-2-mercaptobenzothiazole with alkenyl bromides. The structure of the compounds was verified by 1H NMR spectra. The compounds have shown antibacterial activity against Staphylococcus aureus and anticandidous activity against Candida albicans. The optimum structure of the studied compounds has been calculated by quantum chemistry AM1 method. The theoretical values of lipophilicity were calculated for all alkenyl substituents. Full article
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26 KiB  
Article
17O NMR of Enamino-Diesters: Intramolecular Hydrogen Bonding in 5-Alkylaminomethylene-2,2-dimethyl-1,3-dioxane-4,6-diones
by Jin-Cong Zhuo
Molecules 1997, 2(2), 31-35; https://doi.org/10.3390/feb97p1 - 25 Feb 1997
Cited by 8 | Viewed by 6181
Abstract
Natural abundance 17O NMR spectra of a series of 5-alkylaminomethylene-2,2-dimethyl-1,3-dioxane-4,6-diones, recorded in acetonitrile solution, are reported. The δ(17O) values correlate well with those of 4-alkylaminobut-3-en-2-ones and with the pKa values of amines. The effects of the N-alkyl groups [...] Read more.
Natural abundance 17O NMR spectra of a series of 5-alkylaminomethylene-2,2-dimethyl-1,3-dioxane-4,6-diones, recorded in acetonitrile solution, are reported. The δ(17O) values correlate well with those of 4-alkylaminobut-3-en-2-ones and with the pKa values of amines. The effects of the N-alkyl groups on the 17O shift values is diminished, owing to the resonance effects of the alkoxy groups. The shift difference (DδHB) between the two carbonyl groups is mainly attributed to the intramolecular hydrogen bonding and depends on the donor property of the amino group. Full article
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