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Table of Contents

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

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	p. 31-35 Jin-Cong Zhuo Article: 17O NMR of Enamino-Diesters: Intramolecular Hydrogen Bonding in 5-Alkylaminomethylene-2,2-dimethyl-1,3-dioxane-4,6-diones Molecules 1997, 2(2), 31-35; doi:10.3390/feb97p1 Received: 20 December 1996 / Accepted: 17 January 1997 / Published: 25 February 1997 Show/Hide Abstract | Download PDF Full-text (26 KB) 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 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.
	p. 36-42 Eva Sidóová, Dusan Loos, Helena Bujdáková and Jana Kallová Article: New Anticandidous 2-Alkylthio-6-aminobenzothiazoles Molecules 1997, 2(2), 36-42; doi:10.3390/feb97p2 Received: 19 October 1996 / Accepted: 26 November 1996 / Published: 25 February 1997 Show/Hide Abstract | Download PDF Full-text (56 KB) 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 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.
	p. 43-45 György Keglevich, Antal Tungler, Kálmán Újszászy, Tibor Novák and László Tôke Communication: Synthesis of 1,2,3,4,5,6-Hexahydrophosphinine 1-Oxides by Catalytic Hydrogenation of 3-Phosphabicyclo[3.1.0]hexane 3-Oxides Molecules 1997, 2(2), 43-45; doi:10.3390/feb97p3 Received: 20 October 1996 / Accepted: 25 October 1996 / Published: 25 February 1997 Show/Hide Abstract | Download PDF Full-text (15 KB) 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.
	p. 46-48 György Keglevich, Kálmán Újszászy, Krisztina Ludányi, Áron Szöllôsy and László Tôke Communication: Synthesis of 1,2,3,6-Tetrahydrophosphinine 1-Oxides by Regioselective Reduction of 1,2-Dihydrophosphinine 1-Oxides Molecules 1997, 2(2), 46-48; doi:10.3390/feb97p4 Received: 20 October 1996 / Accepted: 25 October 1996 / Published: 25 February 1997 Show/Hide Abstract | Download PDF Full-text (15 KB) Abstract: Synthesis of 1,2,3,6-tetrahydrophosphinine 1-oxides by regioselective reduction of 1,2-dihydrophosphinine 1-oxides was reported in this communication.
	p. 49-56 Vladimir Ondrus and Lubor Fisera Article: Synthesis and 1,3-Dipolar Cycloaddition Reactions of Chiral Maleimides Molecules 1997, 2(2), 49-56; doi:10.3390/feb97p5 Received: 19 October 1996 / Accepted: 10 December 1996 / Published: 25 February 1997 Show/Hide Abstract | Download PDF Full-text (42 KB) 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 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.
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