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p. 854
Published: 31 December 2002
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p. 855-857
Published: 31 December 2002
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p. 858-860
Published: 31 December 2002
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p. 861-866
Received: 22 November 2002; in revised form: 3 December 2002 / Accepted: 4 December 2002 / Published: 31 December 2002
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| Download PDF Full-text (39 KB) Abstract: A novel class of anion receptors with with C-H···X- hydrogen bonding is introduced and demonstrated for Cl- , Br- , NO3 - and HSO4 - recognition. Cyclic voltammetry revealed that novel ferrocenylimidazolium salts, syntheses of which are briefly described, selectively complex and electrochemically recognise guest anions. Futhermore, proton NMR spectroscopy indicated the formation of 1:2 stoichiometric complexes with Cl- , Br and I- and 1:1 stoichiometric complexes with NO3 - and HSO4 - .
p. 867-870
Received: 15 October 2002; in revised form: 11 December 2002 / Accepted: 12 December 2002 / Published: 31 December 2002
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| Download PDF Full-text (22 KB) Abstract: A fast and simple method for the oxidative iodination of some aromatic amines, under microwave irradiation , is reported, using diiodine and the the strongly Hbonded urea-hydrogen peroxide addition compound (H2 NCONH2 ···H2 O2 , UHP) as the oxidant. The reactions were carried out in boiling CHCl3 under a reflux condenser to afford, within 10 minutes , the purified monoiodinated products in 40-80% yields.
p. 871-884
Received: 13 August 2002; in revised form: 28 November 2002 / Accepted: 4 December 2002 / Published: 31 December 2002
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| Download PDF Full-text (143 KB) Abstract: Three new heterocyclic substituted dianilides, namely 3-chloro-5-[1-(pfluorophenylcarbamoyl)-2-(2-thienyl)ethenyl]thieno-[3,2-b ]thiophene-2-carboxy-p -fluoroanilide (8), 1,2-bis{5-[2-(p -fluorophenylcarbamoyl)-2-(2-thienyl)ethenyl]-2-thienyl}ethene (13) and 6-chloro-2-{2-[3-chloro-2-(p -fluorophenyl-carbamoyl)-5-thieno[3,2-b ]thienyl]-2-ethoxycarbonylethenyl}thieno[3,2-b ]furan-5-carboxy-p -fluoroanilide (20) were prepared by multistep synthesis. The prepared dianilides are of particular interest for their potential to serve as the planar heteroaromatic core of DNA intercalators or groove binders.
p. 885-895
Received: 12 March 2002; in revised form: 15 November 2002 / Accepted: 17 November 2002 / Published: 31 December 2002
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| Download PDF Full-text (397 KB) | Abstract: A number of chalcones were prepared by condensing either 1-acetylnaphthalene or substituted 1-acetylnaphthalenes with 1-naphthaldehyde or 4-dimethylamino-1-naphthaldehyde in ethanolic NaOH solutions. These chalcones were immediately reacted with hydrazine hydrochloride, phenyl hydrazine and semicarbazide hydrochloride in the presence of dry acetic acid to obtain the corresponding 2-pyrazolines. The synthesised heterocycles were characterized on the basis of their chemical properties and spectroscopic data. These compounds were tested for antimicrobial activity against a variety of test organisms: Escherichia coli, Staphylococcus aureus, Klebsiella pneumoniae, Proteus mirabillis, Shigella dysentry and Salmonella typhii . The compounds containing chloro, hydroxo and dimethylamino - N(CH3 )2 group as substituents on the naphthalene rings have been found to be very effective antimicrobial agents. In addition, the presence of a carboxamido -CONH2 substituent group at the N-1 position of the 2-pyrazoline rings is shown to contribute substantially to the antimicrobial activity.
p. 896-901
Received: 25 October 2002 / Accepted: 4 December 2002 / Published: 31 December 2002
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| Download PDF Full-text (96 KB) Abstract: A fluorimetric assay of aldehyde dehydrogenase isozymes, based on naphthaldehyde oxidation, is compared with Western Blotting analysis on several clinical samples obtained from surgery. The comparison reveals qualitatively good correlation of ALDH1A1 isozyme detection with two methods and somewhat worse on ALDH3A1 assay.
p. 902-906
Received: 3 November 2002; in revised form: 2 December 2002 / Accepted: 2 December 2002 / Published: 31 December 2002
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| Download PDF Full-text (20 KB) Abstract: Two alternative and complementary one-pot procedures for the direct transformation of 2-amino alcohols to N-tosyl aziridines are presented. The unsubstituted parent compound and its less hindered homologues can be obtained in high yields by tosylation and in situ cyclisation effected by potassium hydroxide in water/dichloromethane. Higher substituted amino alcohols give better yields using potassium carbonate in acetonitrile. Both procedures use simple inorganic bases and produce only inorganic salts as byproducts.
p. 907-916
Received: 2 September 2002; in revised form: 30 November 2002 / Accepted: 12 December 2002 / Published: 31 December 2002
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| Download PDF Full-text (51 KB) Abstract: 3-(4-Substitutedphenyl)aminoisoxazol-5(2H)-ones, substituted on nitrogen with a nitropyridine group, react with triethylamine to give imidazo[1,2-a]pyridines and indoles. With 4-bromophenyl and 4-methylphenyl group substituents only imidazopyridines are formed, but the 4-methoxyphenyl derivative gave a 3:1 mixture of the corresponding imidazo[1,2-a]pyridine and 2-pyridylaminoindole, respectively.
p. 917-921
Received: 8 January 2002; in revised form: 16 December 2002 / Accepted: 17 December 2002 / Published: 31 December 2002
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| Download PDF Full-text (30 KB) Abstract: A convenient route to 3-alkenyl-1-azaanthraquinones via a hetero Diels-Alder reaction between an azadiene and naphthoquinone, a free radical chlorination and an electron transfer reaction is reported.
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