Results 91 to 100 of about 185 (123)
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A novel photoisomerzation of 1,2‐benzothiazine 1,1‐dioxides to 1,3‐benzothiazine 1,1‐dioxides
Journal of Heterocyclic Chemistry, 2007AbstractA novel facile photoconversion of 4‐hydroxy‐1,2‐bezothiazine 1,1‐dioxides (3a‐e) into 4‐oxo‐1,3‐2H‐benzothiazine 1,1‐dioxides (4a‐e) and 4‐hydroxy‐2‐methyl‐N‐(pyridin‐2‐yl)‐2H‐1,2‐benzothiazine‐3‐carboxamide 1,1‐dioxide (PRX) into N‐methyl saccharin (2) upon 254 nm irradiation in methanol or acetonitrile is reported.
Ibrahim Elghamry +2 more
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New approach to the synthesis of 3-amino-1,2-benzothiazine 1,1-dioxides
Chemistry of Heterocyclic Compounds, 1992The possibility of obtaining 3-amino-1,2-benzothiazine 1,1-dioxides by nucleophilic substitution of the chlorine atom in 5-nitro-2-chlorobenzenesulfonamides by carbanions generated from substituted acetonitriles was studied.
A. G. Nemazanyi +3 more
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Synthesis of Indolo‐1,2‐Benzothiazines from Sulfoximines and 3‐Diazoindolin‐2‐imines
Advanced Synthesis & Catalysis, 2017AbstractA rhodium‐catalyzed cyclization reaction of sulfoximines with 3‐diazoindolin‐2‐imines is described. This protocol provides a wide range of indolo‐1,2‐benzothiazines in moderate to excellent yields together with the release of molecular nitrogen and p‐toluenesulfonamide.
Gi Hoon Ko +7 more
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Synthesis, 2016
An efficient method for the synthesis of bioactive heterocycles containing 1,2-benzothiazine 1,1-dioxide derivatives via Pd-catalyzed intramolecular Heck cyclization is reported. The method offers the regioselective synthesis of highly functionalized benzosultams in 80–85% yields.
Shovan Mondal +2 more
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An efficient method for the synthesis of bioactive heterocycles containing 1,2-benzothiazine 1,1-dioxide derivatives via Pd-catalyzed intramolecular Heck cyclization is reported. The method offers the regioselective synthesis of highly functionalized benzosultams in 80–85% yields.
Shovan Mondal +2 more
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ChemInform, 2016
AbstractA Rh‐catalyzed domino C—H activation/cyclization/condensation sequence is developed to synthesize 1,2‐benzothiazines from NH‐sulfoximes and 2‐diazo‐1,3‐dicarbonyl compounds.
Ying Cheng, Carsten Bolm
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AbstractA Rh‐catalyzed domino C—H activation/cyclization/condensation sequence is developed to synthesize 1,2‐benzothiazines from NH‐sulfoximes and 2‐diazo‐1,3‐dicarbonyl compounds.
Ying Cheng, Carsten Bolm
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Farmaco (Societa chimica italiana : 1989), 1989
We report the synthesis of N-heterocyclic carboxamides of 5-methyl-4-oxo-2,3,4,5-tetrahydrothiopyrano [3,2-c][1,2]benzothiazine 6,6-dioxide, their antiinflammatory and analgesic activities and the attempts to obtain a corresponding sulfoxidate series.
SCHIAFFELLA, Fausto +5 more
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We report the synthesis of N-heterocyclic carboxamides of 5-methyl-4-oxo-2,3,4,5-tetrahydrothiopyrano [3,2-c][1,2]benzothiazine 6,6-dioxide, their antiinflammatory and analgesic activities and the attempts to obtain a corresponding sulfoxidate series.
SCHIAFFELLA, Fausto +5 more
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New Ambidentate Ligands—Derivatives of 1,2-Benzothiazine-1,1-Dioxide
Russian Journal of Coordination Chemistry, 2000O. Yu. Korshunov +2 more
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Pyrano[3,2-c][1,2]benzothiazine 5,5-dioxide derivatives: synthesis and structural assignment
1990Pyrano[3,2-c][1,2] Benzothiazine 5,5-dioxide derivatives: Synthesis and NMR Structural ...
P. Dalla Croce, C. La Rosa, H. Molinari
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