A. Lévai &ndash; Research Output

2012

9 Citations (Scopus)

Synthesis and structure elucidation of novel pyrazolyl-2-pyrazolines obtained by the reaction of 3-(3-aryl-3-oxopropenyl)chromen-4-ones with phenylhydrazine

Santos, C. M. M., Silva, A. M. S., Jekó́, J. & Lévai, A., máj. 23 2012, In : Arkivoc. 2012, 5, p. 265-281 17 p.

Research output: Article

Acetylation

Energy barriers

Dimethyl Sulfoxide

Acetic Acid

Nuclear magnetic resonance

2009

2 Citations (Scopus)

A simple efficient procedure for the stereoselective synthesis of trans-2,3,3a,4-tetrahydro-3-aryl-2-(4-carboxyphenyl)[1]benzopyrano[4,3-c] pyrazoles and their [1]benzothiopyrano analogues

Lévai, A. & Jekó́, J., 2009, In : Acta Chimica Slovenica. 56, 3, p. 566-570 5 p.

Research output: Article

hydrazine

Pyrazoles

Microanalysis

Nuclear magnetic resonance

pyridine

2 Citations (Scopus)

Dimethyldioxirane oxidation of exocyclic (E,E)-cinnamylideneketones

Lévai, A., Silva, A. M. S., Santos, C. M. M., Cavaleiro, J. A. S. & Jek, J., 2009, In : Australian Journal of Chemistry. 62, 1, p. 82-89 8 p.

Research output: Article

Bearings (structural)

Stereochemistry

Acetone

Nuclear magnetic resonance

Derivatives

10 Citations (Scopus)

Synthesis of 5-aryl-1-carboxyphenyl-3-(3-coumarinyl)-2-pyrazolines

Lévai, A. & Jekó́, J., 2009, In : Arkivoc. 2009, 6, p. 63-70 8 p.

Research output: Article

hydrazine

Microanalysis

Acetic Acid

Nuclear magnetic resonance

10 Citations (Scopus)

Synthesis of spiro-1-pyrazolines by the reaction of exocyclic α,β,γ,δ-unsaturated ketones with diazomethane

Lévai, A., Simon, A., Jenei, A., Kálmán, G., Jekó́, J. & Tóth, G., 2009, In : Arkivoc. 2009, 12, p. 161-172 12 p.

Research output: Article

Diazomethane

Ketones

Stereochemistry

Nuclear magnetic resonance

cinnamic aldehyde

2008

2 Citations (Scopus)

NMR spectroscopic elucidation of the structure and stereochemistry of tricyclic 3-styrylpyrazolines

Tóth, G., Simon, A., Jenei, A., Jekó́, J. & Lévai, A., nov. 2008, In : Magnetic Resonance in Chemistry. 46, 11, p. 1025-1029 5 p.

Research output: Article

Stereochemistry

hydrazine

Nuclear magnetic resonance

Propionic acid

Column chromatography

6 Citations (Scopus)

Oxazepines and thiazepines 46.¹ Synthesis of tetracyclic 1,5-benzothiazepines by the reaction of α,β,γ,δ- unsaturated ketones with 2-aminothiophenol

Lévai, A. & Jekó́, J., 2008, In : Arkivoc. 2008, 17, p. 234-240 7 p.

Research output: Article

Thiazepines

Oxazepines

Ketones

Nuclear magnetic resonance

Acids

15 Citations (Scopus)

Synthesis and chemical transformations of benzoxazepines

Lévai, A., 2008, In : Heterocycles. 75, 9, p. 2155-2185 31 p.

Research output: Article

Oxazepines

Derivatives

22 Citations (Scopus)

Synthesis of optically active 1,5-benzothiazepines

Lévai, A. & Kiss-Szikszai, A., máj. 23 2008, In : Arkivoc. 2008, 1, p. 65-86 22 p.

Research output: Article

Bioactivity

Derivatives

1,5-benzothiazepine

2007

1 Citation (Scopus)

Energy-variable collision-induced dissociation study of 1,3,5-trisubstituted 2-pyrazolines by electrospray mass spectrometry

Kéki, S., Nagy, L., Török, J., Tóth, K., Lévai, A. & Zsuga, M., 2007, In : Rapid Communications in Mass Spectrometry. 21, 11, p. 1799-1808 10 p.

Research output: Article

Mass spectrometry

Ions

Derivatives

Cations

Chemical analysis

32 Citations (Scopus)

Epoxidation of (E,E)-cinnamylideneacetophenones with hydrogen peroxide and iodosylbenzene with salen-Mn^III as the catalyst

Santos, C. M. M., Silva, A. M. S., Cavaleiro, J. A. S., Lévai, A. & Patonay, T., 2007, In : European Journal of Organic Chemistry. 17, p. 2877-2887 11 p.

Research output: Article

Stereochemistry

Epoxidation

Cyclization

Oxidants

Hydrogen Peroxide

8 Citations (Scopus)

Fused heterocycles 11. Synthesis of tricyclic fused pyrazolines by the reaction of 3-arylidenechromanones and 3-arylidene-1-thiochromanones with hydrazine

Lévai, A., Kövér, K. & Jekó́, J., 2007, In : Arkivoc. 2007, 8, p. 26-39 14 p.

Research output: Article

hydrazine

Acetic Acid

Nuclear magnetic resonance

propionic acid

16 Citations (Scopus)

Synthesis of 4-aryl-3(5)-(2-hydroxyphenyl)pyrazoles by reaction of isoflavones and their 4-thio analogues with hydrazine derivatives

Lévai, A., Silva, A. M. S., Cavaleiro, J. A. S., Elguero, J., Alkorta, I. & Jekó́, J., 2007, In : Australian Journal of Chemistry. 60, 12, p. 905-914 10 p.

Research output: Article

hydrazine

Pyrazoles

Isoflavones

Derivatives

Dimethyl Sulfoxide

3 Citations (Scopus)

Synthesis of benzo[b][1,4]thiazepines by the reaction of 3-aryl-1-(3-coumarinyl)propen-1-ones with 2-aminothiophenol [1]

Lévai, A., Jekó́, J., Gondos, T., Simon, A. & Tóth, G., nov. 2007, In : Journal of Heterocyclic Chemistry. 44, 6, p. 1453-1458 6 p.

Research output: Article

Thiazepines

Chromans

Toluene

Acetic Acid

Experiments

15 Citations (Scopus)

Synthesis of carboxylic acid derivatives of 2-pyrazolines

Lévai, A. & Jekó́, J., máj. 3 2007, In : Arkivoc. 2007, 1, p. 134-145 12 p.

Research output: Article

hydrazine

Carboxylic Acids

Derivatives

Acetic Acid

Bearings (structural)

2006

8 Citations (Scopus)

Cinnamylidene ketones as potential modulators of multidrug resistance in mouse lymphoma and human colon cancer cell lines

Engi, H., Gyémánt, N., Lóránd, T., Lévai, A., Ocsovszki, I. & Molnár, J., jan. 2006, In : In Vivo. 20, 1, p. 119-124 6 p.

Research output: Article

Multiple Drug Resistance

Ketones

Colonic Neoplasms

Modulators

Lymphoma

5 Citations (Scopus)

Epoxidation studies of 2-styrylchromones using Jacobsen's catalyst and hydrogen peroxide and iodosylbenzene as oxidants

Santos, C. M. M., Silva, A. M. S., Cavaleiro, J. A. S., Patonay, T. & Lévai, A., szept. 2006, In : Journal of Heterocyclic Chemistry. 43, 5, p. 1319-1326 8 p.

Research output: Article

Epoxidation

Oxidants

Hydrogen Peroxide

Catalysts

Epoxy Compounds

1 Citation (Scopus)

NMR spectroscopic structure elucidation of the products of the reaction of 3-(3-aryl-3-oxopropenyl)chromen-4-ones with 1,2-phenylenediamine

Tóth, G., Simon, A., Gondos, T., Lévai, A., Jekó́, J. & Andrási, F., szept. 2006, In : Magnetic Resonance in Chemistry. 44, 9, p. 856-860 5 p.

Research output: Article

Nuclear magnetic resonance

nuclear magnetic resonance

products

Experiments

1,2-diaminobenzene

6 Citations (Scopus)

Reductive formation of 1,5-benzothiazepines

Lévai, A., Tóth, G., Gondos, T., Jekó́, J. & Brahmbhatt, D. I., júl. 1 2006, In : Heterocycles. 68, 7, p. 1319-1324 6 p.

Research output: Article

2-aminothiophenol

1,5-benzothiazepine

11 Citations (Scopus)

Synthesis of 1,5-disubstituted 3-(4-Hydroxy-6-methyl-2-oxo-2H-pyran-3-yl)- 2-pyrazolines

Lévai, A. & Jekó́, J., márc. 2006, In : Monatshefte fur Chemie. 137, 3, p. 339-345 7 p.

Research output: Article

hydrazine

Pyrans

Ketones

Acetic Acid

Nuclear magnetic resonance

27 Citations (Scopus)

Synthesis of 1-substituted 3,5-diaryl-2-pyrazolines by the reaction of α,β-unsaturated ketones with hydrazines

Lévai, A. & Jekó́, J., jan. 2006, In : Journal of Heterocyclic Chemistry. 43, 1, p. 111-115 5 p.

Research output: Article

hydrazine

Hydrazines

Ketones

Acetic Acid

Spectroscopy

13 Citations (Scopus)

Synthesis of 1-substituted 5-aryl-3-styryl-2-pyrazolines and 3-aryl-5-styryl-2-pyrazolines by the reaction of dibenzylideneacetones and E,E-cinnamylideneacetophenones with hydrazines

Lévai, A. & Jekó́, J., szept. 2006, In : Journal of Heterocyclic Chemistry. 43, 5, p. 1303-1309 7 p.

Research output: Article

hydrazine

Hydrazines

Acetophenones

Derivatives

Ketones

35 Citations (Scopus)

Synthesis of pyrazoles by treatment of 3-benzylchromones, 3-benzylflavones and their 4-thio analogues with hydrazine

Lévai, A., Silva, A. M. S., Cavaleiro, J. A. S., Alkorta, I., Elguero, J. & Jekó́, J., jún. 12 2006, In : European Journal of Organic Chemistry. 12, p. 2825-2832 8 p.

Research output: Article

hydrazine

Pyrazoles

Nuclear magnetic resonance

Dimethyl Sulfoxide

Hydrogen

2005

7 Citations (Scopus)

An efficient procedure for the preparation of 4-methyl-2-thiocoumarins by the reaction of 4-methylcoumarins with lawesson's reagent

Lévai, A. & Jekó́, J., máj. 2005, In : Journal of Heterocyclic Chemistry. 42, 4, p. 739-742 4 p.

Research output: Article

2,4-bis(4-methoxyphenyl)-1,3,2,4-dithiadiphosphetane-2,4-disulfide

Toluene

9 Citations (Scopus)

Enantioselective reduction of C=N double bond by chromium(II) complexes of natural amino acids

Micskei, K., Holczknecht, O., Marchis, V., Lévai, A., Patonay, T., Zucchi, C. & Pályi, G., 2005, In : Chirality. 17, 9, p. 511-514 4 p.

Research output: Article

Oximes

Enantioselectivity

Chromium

Amino acids

Amino Acids

1 Citation (Scopus)

Matrix-assisted laser desorption/ionization and electrospray ionization mass spectrometric study of 2,3-dihydro-1,4-benzoxazepines

Kéki, S., Nagy, L., Deák, G., Lévai, A. & Zsuga, M., 2005, In : Rapid Communications in Mass Spectrometry. 19, 10, p. 1263-1267 5 p.

Research output: Article

Electrospray ionization

Ionization

Desorption

Ions

Lasers

9 Citations (Scopus)

Novel and simple synthesis of carboxyl-terminated polyisobutylenes

Nagy, M., Kéki, S., Orosz, L., Deák, G., Herczegh, P., Lévai, A. & Zsuga, M., máj. 17 2005, In : Macromolecules. 38, 10, p. 4043-4046 4 p.

Research output: Article

Polymers

Derivatives

Nitriles

Anhydrides

Aldehydes

22 Citations (Scopus)

Synthesis of 1-substituted 5-aryl-3-(3-coumarinyl)-2-pyrazolines by the reaction of 3-aryl-1-(3-coumarinyl)propen-1-ones with hydrazines

Lévai, A., Jekó́, J. & Brahmbhatt, D. I., szept. 2005, In : Journal of Heterocyclic Chemistry. 42, 6, p. 1231-1235 5 p.

Research output: Article

Hydrazines

Chalcones

hydrazine

Acetic Acid

Spectroscopy

47 Citations (Scopus)

Synthesis of chlorinated 3,5-diaryl-2-pyrazolines by the reaction of chlorochalcones with hydrazines

Lévai, A., máj. 5 2005, In : Arkivoc. 2005, 9, p. 344-352 9 p.

Research output: Article

Hydrazines

Acetic Acid

Nuclear magnetic resonance

15 Citations (Scopus)

Synthesis of hydroxylated 3,5-diaryl-2-pyrazolines by the reaction of hydroxychalcones with hydrazines

Lévai, A. & Jekó́, J., jún. 25 2005, In : Arkivoc. 2005, 10, p. 199-205 7 p.

Research output: Article

Hydrazines

Acetic Acid

Nuclear magnetic resonance spectroscopy

2004

8 Citations (Scopus)

Bromination and azidation reactions of 2-styrylchromones. New syntheses of 4(5)-aryl-5(4)-(2-chromonyl)-1,2,3-triazoles

Silva, A. M. S., Vieira, J. S., Brito, C. M., Cavaleiro, J. A. S., Patonay, T., Lévai, A. & Elguero, J., márc. 2004, In : Monatshefte fur Chemie. 135, 3, p. 293-308 16 p.

Research output: Article

Chromones

Triazoles

Bearings (structural)

Electrons

Sodium Azide

13 Citations (Scopus)

Cationization of simple organic molecules by singly-charged Ag ₃⁺ cluster ions in matrix-assisted laser desorption/ionization mass spectrometry: Metal cluster-molecule interactions

Kéki, S., Nagy, L., Deák, G., Zsuga, M., Somogyi, L. & Lévai, A., jún. 2004, In : Journal of the American Society for Mass Spectrometry. 15, 6, p. 879-883 5 p.

Research output: Article

Matrix-Assisted Laser Desorption-Ionization Mass Spectrometry

Ionization

Mass spectrometry

Desorption

Metals

1 Citation (Scopus)

Dimethyldioxirane epoxidation of 3-aryl-1-(3-coumarinyl)propen-1-ones

Lévai, A., Jekó́, J. & Brahmbhatt, D. I., szept. 2004, In : Journal of Heterocyclic Chemistry. 41, 5, p. 707-709 3 p.

Research output: Article

Epoxidation

Epoxy Compounds

dimethyldioxirane

7 Citations (Scopus)

Microwave-induced, solvent-free transformations of benzoheteracyclanones by HTIB (Koser's reagent)

Patonay, T., Lévai, A., Rimán, É. & Varma, R. S., 2004, In : Arkivoc. 2004, 7, p. 183-195 13 p.

Research output: Article

4-Quinolones

Dehydrogenation

Microwaves

Substrates

flavanone

18 Citations (Scopus)

Oxazepines and thiazepines. 41 [1]. Synthesis of 4-aryl-2,3-dihydro-2- styryl-1,5-benzothiazepines by the reaction of (E,E)-cinnamylideneacetophenones with 2-aminothiophenol and their conversion into 2,2-disubstituted 3-acetyl-2,3-dihydrobezothiazoles

Lévai, A., máj. 2004, In : Journal of Heterocyclic Chemistry. 41, 3, p. 399-403 5 p.

Research output: Article

Thiazepines

Oxazepines

Acids

2-aminothiophenol

1,5-benzothiazepine

1 Citation (Scopus)

Post-source decay matrix-assisted laser desorption/ionization mass spectrometric study of tetracyclic 2,3-dihydro-1,5-benzothiazepines

Kéki, S., Nagy, L., Deák, G., Lévai, A. & Zsuga, M., 2004, In : Rapid Communications in Mass Spectrometry. 18, 12, p. 1259-1264 6 p.

Research output: Article

Ionization

Desorption

Ions

Lasers

Silver

3 Citations (Scopus)

Regioselective epoxidation of 3-(3-oxo-3-arylpropenyl)chromen-4-ones by dimethyldioxirane

Lévai, A. & Jekó́, J., máj. 2004, In : Journal of Heterocyclic Chemistry. 41, 3, p. 439-441 3 p.

Research output: Article

Epoxidation

Epoxy Compounds

dimethyldioxirane

44 Citations (Scopus)

Synthesis and reactivity of styrylchromones

Silva, A. M. S., Pinto, D. C. G. A., Cavaleiro, J. A. S., Lévai, A. & Patonay, T., 2004, In : Arkivoc. 2004, 7, p. 106-123 18 p.

Research output: Article

Heterocyclic Compounds

Bioactivity

Oxygen

26 Citations (Scopus)

Synthesis of exocyclic α,β-unsaturated ketones

Lévai, A., 2004, In : Arkivoc. 2004, 7, p. 15-33 19 p.

Research output: Article

Ketones

Isoflavones

Biological Products

aurone

11 Citations (Scopus)

Synthesis of heterocyclic compounds by the reactions of exocyclic α,β-unsaturated ketones

Lévai, A., máj. 2004, In : Journal of Heterocyclic Chemistry. 41, 3, p. 299-310 12 p.

Research output: Article

Heterocyclic Compounds

Ketones

16 Citations (Scopus)

Synthesis of isoflavones

Lévai, A., júl. 2004, In : Journal of Heterocyclic Chemistry. 41, 4, p. 449-460 12 p.

Research output: Article

Isoflavones

54 Citations (Scopus)

Synthesis of pyrazolyl-2-pyrazolines by treatment of 3-(3-aryl-3- oxopropenyl)chromen-4-ones with hydrazine and their oxidation to bis(pyrazoles)

Lévai, A., Silva, A. M. S., Pinto, D. C. G. A., Cavaleiro, J. A. S., Alkorta, I., Elguero, J. & Jekó́, J., nov. 12 2004, In : European Journal of Organic Chemistry. 22, p. 4672-4679 8 p.

Research output: Article

hydrazine

Pyrazoles

Acetic Acid

Nuclear magnetic resonance

Oxidation

3 Citations (Scopus)