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A. Lévai, · SciRah

Researcher profile · Semantic Scholar

A. Lévai,

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A. Lévai, — researcher profile on SciRah

h-index: 24
Works: 297
Citations: 2,294

Most-cited papers

Synthesis of chlorinated 3,5-diaryl-2-pyrazolines by the reaction of chlorochalcones with hydrazines
A. Lévai,
200560 citations Open access
Semantic Scholar
Asymmetric Weitz-Scheffer epoxidation of isoflavones with hydroperoxides mediated by optically active phase-transfer catalysts.
W. Adam, P. Rao, Hans-Georg Degen, A. Lévai, +2 more
2002Journal of Organic Chemistry58 citations
Semantic Scholar
Synthesis of Pyrazolyl‐2‐pyrazolines by Treatment of 3‐(3‐Aryl‐3‐oxopropenyl)chromen‐4‐ones with Hydrazine and Their Oxidation to Bis(pyrazoles)
A. Lévai,, Artur M. S. Silva, D. Pinto, J. Cavaleiro +3 more
200442 citations
Semantic Scholar
Synthesis and reactivity of styrylchromones
Artur M. S. Silva, D. Pinto, J. Cavaleiro, A. Lévai, +1 more
200434 citations Open access
Semantic Scholar
Synthesis of Pyrazoles by Treatment of 3‐Benzylchromones, 3‐Benzylflavones and Their 4‐Thio Analogues with Hydrazine
A. Lévai,, Artur M. S. Silva, J. Cavaleiro, I. Alkorta +2 more
200633 citations
Semantic Scholar
Highly diastereoselective Michael reaction under solvent-free conditions using microwaves: Conjugate addition of flavanone to its chalcone precursor
T. Patonay,, R. Varma, A. Vass, A. Lévai, +1 more
200133 citations Open access
Semantic Scholar
Chemo- and diastereoselectivity in the dimethyldioxirane oxidation of 2,3-dihydro-4H-1-benzothiopyran-4-ones and 4H-1-benzothiopyran-4-ones. Unusual reactivity of 4H-1-benzothiopyran-4-one 1-oxides.
T. Patonay,, Waldemar Adam, A. Lévai,, P. Kövér +3 more
2001Journal of Organic Chemistry32 citations
Semantic Scholar
1H, 13C, 17O NMR and quantum‐chemical study of the stereochemistry of the sulfoxide and sulfone derivatives of 3‐arylidene‐1‐thioflavan‐4‐one epoxides
J. Kovács, G. Tóth, A. Simon, A. Lévai, +2 more
200331 citations
Semantic Scholar
Synthesis of 3-aryl-5-styryl-2-pyrazolines by the reaction of (E, E)-cinnamylideneacetophenones with hydrazines and their oxidation into pyrazoles
A. Lévai,, T. Patonay,, Artur M. S. Silva, D. Pinto +1 more
200229 citations Open access
Semantic Scholar
Synthesis of 1‐substituted 3,5‐diaryl‐2‐pyrazolines by the reaction of α,β‐unsaturated ketones with hydrazines
A. Lévai,, J. Jekő
200628 citations
Semantic Scholar
NMR and quantum‐chemical study of the stereochemistry of spiroepoxides obtained by oxidation of (Z)‐3‐arylidene‐1‐thioflavan‐4‐ones
G. Tóth, J. Kovács, A. Lévai,, E. Kleinpeter +1 more
200126 citations
Semantic Scholar
Synthesis of isoflavones
A. Lévai,
200424 citations
Semantic Scholar
Epoxidation of (E,E)‐Cinnamylideneacetophenones with Hydrogen Peroxide and Iodosylbenzene with Salen‐MnIII as the Catalyst
Clementina M. M. Santos, Artur M. S. Silva, J. Cavaleiro, A. Lévai, +1 more
200723 citations Open access
Semantic Scholar
Enantioselective hydrogenation of exocyclic α, β-unsaturated ketones. Part II. Hydrogenation in the presence of (S)-proline
G. Fogassy, A. Tungler, A. Lévai,, G. Tóth
200223 citations
Semantic Scholar
Synthesis of Exocyclic α,β-Unsaturated Ketones
A. Lévai,
200321 citations Open access
Semantic Scholar
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 †
A. Lévai,, J. Jekő, D. I. Brahmbhatt
200520 citations
Semantic Scholar
Oxazepines and thiazepines. 41 . 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
A. Lévai,
200419 citations
Semantic Scholar
Enantioselective hydrogenation of exocyclic α,β-unsaturated ketones: Part III. Hydrogenation with Pd in the presence of cinchonidine
G. Fogassy, A. Tungler, A. Lévai,
200318 citations
Semantic Scholar
Synthesis of 3‐aroyl‐4‐(3‐chromonyl)‐2‐pyrazolines
A. Lévai,, J. Jekő
200218 citations
Semantic Scholar
Synthesis of carboxylic acid derivatives of 2-pyrazolines
A. Lévai,, J. Jekő
200717 citations Open access
Semantic Scholar
Cationization of simple organic molecules by singly-charged Ag3+ cluster ions in matrix-assisted laser desorption/ionization mass spectrometry: Metal cluster-molecule interactions
S. Kéki, L. Nagy, G. Déak, M. Zsuga +2 more
2004Journal of the American Society for Mass Spectrometry17 citations Open access
Semantic Scholar
Synthesis and Chemical Transformations of Benzoxazepines
A. Lévai,
200816 citations Open access
Semantic Scholar
Synthesis of heterocyclic compounds by the reactions of exocyclic α,β‐unsaturated ketones
A. Lévai,
200415 citations
Semantic Scholar
Synthesis of vinca alakaloids and realated compounds. 98. Oxidation with dimethyldioxirane of compounds containing the aspidospermane and quebrachamine ring system. A simple synthesis of (7S, 20S)-(+)-rhazidigenine and (2R, 7S, 20S)-(+)-rhazidine
J. Éles, G. Kalaus, L. Szabo, A. Lévai, +4 more
200215 citations
Semantic Scholar
Dimethyldioxirane as a new and effective oxidation agent for the epoxidation of α,ω‐di(isobutenyl)polyisobutylene: A convenient synthesis of α,ω‐di(2‐methyl‐3‐hydroxypropyl)‐polyisobutylene
S. Kéki, M. Nagy, G. Déak, A. Lévai, +1 more
200215 citations Open access
Semantic Scholar
Dimethyldioxirane oxidation of (E,E)-cinnamylideneacetophenones
A. Lévai,, Artur M. S. Silva, J. Cavaleiro, T. Patonay, +1 more
200115 citations
Semantic Scholar
Synthesis of spiro-1-pyrazolines by the reaction of exocyclic α,β,γ,δ-unsaturated ketones with diazomethane
A. Lévai,, A. Simon, Attila Jenei, G. Kálmán +2 more
200914 citations Open access
Semantic Scholar
Synthesis of 5-aryl-1-carboxyphenyl-3-(3-coumarinyl)-2-pyrazolines
A. Lévai,, J. Jekő
200914 citations Open access
Semantic Scholar
Synthesis of optically active 1,5-benzothiazepines
A. Lévai,, A. Kiss-Szikszai
200814 citations Open access
Semantic Scholar
Synthesis of 4-aryl-3(5)-(2-hydroxyphenyl)pyrazoles by reaction of isoflavones and their 4-thio analogues with hydrazine derivatives
A. Lévai,, Artur M. S. Silva, J. Cavaleiro, J. Elguero +2 more
200713 citations
Semantic Scholar
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
A. Lévai,, J. Jekő
200613 citations
Semantic Scholar
Cinnamylidene ketones as potential modulators of multidrug resistance in mouse lymphoma and human colon cancer cell lines.
H. Engi, N. Gyémánt, T. Lóránd, A. Lévai, +2 more
2006In Vivo12 citations
Semantic Scholar
Synthesis of hydroxylated 3,5-diaryl-2-pyrazolines by the reaction of hydroxychalcones with hydrazines
A. Lévai,, J. Jekő
200510 citations Open access
Semantic Scholar
An efficient procedure for the preparation of 4-methyl-2-thiocoumarins by the reaction of 4-methylcoumarins with lawesson's reagent
A. Lévai,, J. Jekő
200510 citations
Semantic Scholar
Bromination and Azidation Reactions of 2-Styrylchromones. New Syntheses of 4(5)-Aryl-5(4)-(2-chromonyl)-1,2,3-triazoles
Artur M. S. Silva, Judite S. Vieira, C. M. Brito, J. Cavaleiro +3 more
200410 citations Open access
Semantic Scholar
SYNTHESIS OF SPIRO-1-PYRAZOLINES BY THE REACTION OF Z-3-ARYLIDENE-1-THIOFLAVANONES WITH DIAZOMETHANE
A. Lévai,
200210 citations
Semantic Scholar
Synthesis and structure elucidation of novel pyrazolyl-2-pyrazolines obtained by the reaction of 3-(3-aryl-3-oxopropenyl)chromen-4-ones with phenylhydrazine
Clementina M. M. Santos, Artur M. S. Silva, J. Jekő, A. Lévai,
20129 citations Open access
Semantic Scholar
Synthesis of 1,5-Disubstituted 3-(4-Hydroxy-6-methyl-2-oxo-2H-pyran-3-yl)-2-pyrazolines
A. Lévai,, J. Jekő
20069 citations Open access
Semantic Scholar
OXAZEPINES AND THIAZEPINES 40* SYNTHESIS OF 4-ARYL-2-(3-CHROMONYL)-2,3-DIHYDRO-1,5-BENZOTHIAZEPINES AND THEIR CONVERSION INTO 3-ACETYL-2,3-DIHYDROBENZOTHIAZOLES
A. Lévai,
20029 citations Open access
Semantic Scholar
Synthesis and chemical transformations of 1,4-, 4,1-, and 1,5-benzoxazepines
A. Lévai,
20019 citations
Semantic Scholar
Epoxidation studies of 2‐styrylchromones using jacobsen's catalyst and hydrogen peroxide and iodosylbenzene as oxidants
Clementina M. M. Santos, Artur M. S. Silva, J. Cavaleiro, T. Patonay, +1 more
20068 citations Open access
Semantic Scholar
Post-source decay matrix-assisted laser desorption/ionization mass spectrometric study of peracetylated isoflavone glycosides cationized by protonation and with various metal ions.
S. Kéki, G. Déak, A. Lévai,, M. Zsuga
2003Journal of Mass Spectrometry8 citations
Semantic Scholar
FUSED HETEROCYCLES 10* SYNTHESIS OF TRICYCLIC FUSED PYRAZOLINES BY THE REACTION OF (Z)-3-ARYLIDENE-1-THIOFLAVANONES WITH HYDRAZINES
A. Lévai,
20038 citations Open access
Semantic Scholar
Synthesis and dimethyldioxirane oxidation of tetrahydrobenzofurans
A. Lévai,, M. Kočevar, G. Tóth, A. Simon +2 more
20028 citations
Semantic Scholar
Enantioselective reduction of C=N double bond by chromium(II) complexes of natural amino acids.
K. Micskei, Orsolya Holczknecht, Valér Marchis, A. Lévai, +3 more
2005Chirality7 citations Open access
Semantic Scholar
Regioselective epoxidation of 3-(3-Oxo-3-arylpropenyl)chromen-4-ones by dimethyldioxirane
A. Lévai,, J. Jekő
20047 citations
Semantic Scholar
Synthesis of Racemic and Enantiomerically Enriched α-Oxyfunctionalized Benzocyclanones and Chromanones by Dimethyldioxirane and Dimethyldioxirane/Mn(III) salen System
T. Patonay,, J. Jekő, A. Kiss-Szikszai, A. Lévai,
20047 citations Open access
Semantic Scholar
Microwave-induced, solvent-free transformations of benzoheteracyclanones by HTIB (Koser's reagent)
T. Patonay,, A. Lévai,, É. Rimán, R. Varma
20046 citations Open access
Semantic Scholar
Epoxidation of homoisoflavones
A. Lévai,
20036 citations
Semantic Scholar
Dioxirane oxidation of sulfur-containing organic compounds
A. Lévai,
20036 citations Open access
Semantic Scholar

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