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Bechir Ben Hassine - One of the best experts on this subject based on the ideXlab platform.
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a new procedure for the synthesis of 4 substituted 2h 1 2 3 benzothiadiazine 1 1 dioxides via directed ortho lithiation of n1 arylsulfonylhydrazonates
Tetrahedron Letters, 2013Co-Authors: Yakdhane Kacem, Bechir Ben HassineAbstract:Abstract N 1 -Arylsulfonylhydrazonates, which are readily available from commercial N 1 -arylsulfonylhydrazides, undergo directed ortho -lithiation with an excess of lithium diisopropylamide and tetramethylethylenediamine to provide new 2 H -1,2,3-benzothiadiazine 1,1-dioxide derivatives in yields ranging from 43% to 85%.
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efficient synthesis of new imidazo 1 2 b 1 2 benzothiazine 4 4 dioxide derivatives via lateral lithiation of n mesitylenesulfonyl hydantoins
Tetrahedron Letters, 2012Co-Authors: Yakdhane Kacem, Bechir Ben HassineAbstract:Abstract N -Mesitylenesulfonyl hydantoins, readily available from commercial α-amino acids, undergo lateral lithiation with an excess of lithium diisopropylamide and tetramethylethylenediamine in the presence of trimethylsilyl chloride to provide new imidazo[1,2- b ][1,2]benzothiazin-2-one 4,4-dioxide derivatives in yields ranging from 44–65%.
Tomas Torroba - One of the best experts on this subject based on the ideXlab platform.
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synthesis of bis 1 2 dithiolo 1 4 thiazines and a 1 2 dithiolo 1 4 thiazine from tertiary Diisopropylamines
Journal of Organic Chemistry, 1999Co-Authors: Charles W Rees, Andrew J P White, David J Williams, Oleg A Rakitin, Lidia S Konstantinova, Carlos F Marcos, Tomas TorrobaAbstract:The reaction of N-(2-chloroethyl)Diisopropylamine 1a with S2Cl2 allows the selective one-pot preparation of the tricyclic 4-(2-chloroethyl) bisdithiolothiazines 2−4 or, by addition of phosphorus pe...
Anton Meller - One of the best experts on this subject based on the ideXlab platform.
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1 2 3 triborolane aus norbornenderivaten allylbenzol und dehalogenierungsprodukten von dichlor diisopropylamino boran 2 4 5 tris diisopropylamino 2 4 5 triborabicyclo 1 1 1 pentan bicyclus oder carboran
Chemische Berichte, 1991Co-Authors: D Bromm, Uwe Seebold, Mathias Noltemeyer, Anton MellerAbstract:1,2,3-Triborolanes from Norbornene Derivatives, Allylbenzene and Dehalogenation Products of Dichloro(diisopropyl-amino)borane; 2,4,5-Tris(diisopropylamino)-2,4,5-triborabicyclo[1.1.1]pentane-Bicyclus or Carborane? The new 1,2,3-tris(diisopropylamino)triborolanes 1, 2, 3 and 4 have been prepared by treatment of mixtures of 2-norbornene (A), 5-methylene-2-norbornene (B), 5-ethylidene-2-norbornene (C) and allylbenzene (D) with dichloro(diisopropylamino)borane with Na/K alloy in hexane. The corresponding species 5, derived from 2,5-norbornadiene (E), is relatively unstable and by a retro Diels-Alder reaction gives 2,3,4-tris(diisopropylamino)-1,5-dicarba-closo-pentaborane(5) (6). The compounds are characterized by chemical analyses, MS and NMR (1H, 11B, 13C, 15N) and 1, 4 and 6 also by X-ray structure analyses.
Yakdhane Kacem - One of the best experts on this subject based on the ideXlab platform.
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a new procedure for the synthesis of 4 substituted 2h 1 2 3 benzothiadiazine 1 1 dioxides via directed ortho lithiation of n1 arylsulfonylhydrazonates
Tetrahedron Letters, 2013Co-Authors: Yakdhane Kacem, Bechir Ben HassineAbstract:Abstract N 1 -Arylsulfonylhydrazonates, which are readily available from commercial N 1 -arylsulfonylhydrazides, undergo directed ortho -lithiation with an excess of lithium diisopropylamide and tetramethylethylenediamine to provide new 2 H -1,2,3-benzothiadiazine 1,1-dioxide derivatives in yields ranging from 43% to 85%.
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efficient synthesis of new imidazo 1 2 b 1 2 benzothiazine 4 4 dioxide derivatives via lateral lithiation of n mesitylenesulfonyl hydantoins
Tetrahedron Letters, 2012Co-Authors: Yakdhane Kacem, Bechir Ben HassineAbstract:Abstract N -Mesitylenesulfonyl hydantoins, readily available from commercial α-amino acids, undergo lateral lithiation with an excess of lithium diisopropylamide and tetramethylethylenediamine in the presence of trimethylsilyl chloride to provide new imidazo[1,2- b ][1,2]benzothiazin-2-one 4,4-dioxide derivatives in yields ranging from 44–65%.
Charles F. Beam - One of the best experts on this subject based on the ideXlab platform.
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preparation of 2 1h pyrazol 5 yl benzenesulfonamides from polylithiated c α n carbo tert butoxyhydrazones and methyl 2 aminosulfonyl benzoate
Journal of Heterocyclic Chemistry, 2008Co-Authors: John D Knight, Charles F. Beam, Jordan B Brown, Jason S Overby, Dwight N CamperAbstract:Select C(α), N-carbo-tert-butoxyhydrazones were dilithiated with excess lithium diisopropylamide followed by condensation with methyl 2-(aminosulfonyl)benzoate, acid cyclization, hydrolysis, and decarboxylation to afford new 2-(1H-pyrazol-5-yl)benzenesulfonamides, [NH-pyrazolyl-ortho-benzene-sulfonamides].
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preparation of 2 1 phenyl 1h pyrazol 5 yl benzenesulfonamides from polylithiated c α n phenylhydrazones and methyl 2 aminosulfonyl benzoate
Journal of Heterocyclic Chemistry, 2005Co-Authors: Michelle A Meierhoefer, Patrick S Dunn, Laela M Hajiaghamohseni, Matthew J Walters, Mildred C Embree, Sally P Grant, Jennifer R Downs, Jessica D Townsend, Clyde R Metz, Charles F. BeamAbstract:Select C(α), N-phenylhydrazones were dilithiated in excess lithium diisopropylamide followed by condensation with methyl 2-(aminosulfonyl)benzoate and acid cyclization to afford new pyrazol-benzenesul-fonamides, 2-(1-phenyl-1H-pyrazol-5-yl)benzenesulfonamides.
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the preparation of benzoisothiazolo 1 2 b 1 2 isoquinolin 11 one 1 1 dioxides from dilithiated ortho toluic acids and lithiated methyl 2 aminosulfonyl benzoate
Journal of Heterocyclic Chemistry, 2004Co-Authors: Patrick S Dunn, Charles F. Beam, Matthew J Walters, Clyde R Metz, William T Pennington, Mariusz KrawiecAbstract:Select dilithiated ortho-toluic acids were prepared in excess lithium diisopropylamide and condensed with methyl 2-(aminosulfonyl)benzoate followed by a twofold cyclization of intermediates to afford benzoisothiazolo[1,2-b][1,2]isoquinolin-11-one-1,1-dioxides, a new fused-ring heterocyclic system.
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preparation of 1h pyrazole 5 carboxamides from dilithiated c α n phenylhydrazones and lithiated ethyl oxanilates or lithiated ethyl oxamate
Journal of Heterocyclic Chemistry, 2001Co-Authors: Jennifer R Downs, Mildred C Embree, Jessica D Townsend, Stefan J Pastine, Deborah A Schady, Heather A Greer, Wayne Kelley, Charles F. BeamAbstract:Dilithiated C(α), N-phenylhydrazones were prepared in excess lithium diisopropylamide and condensed with either ethyl oxanilate, ethyl 4′-chlorooxanilate, or ethyl oxamate to give intermediates that were quenched and acid cyclized to substituted lH-pyrazole-5-carboxamides.