Characteristic Hydrogen Bonding Observed in the Crystals of Aromatic Sulfonamides: 1D Chain Assembly of Molecules and Chiral Discrimination on Crystallization
achiral, except for kryptoracemates. In contrast, a high proportion of compounds with Helical or Straight patterns in the crystals showed chiral crystallization. Our classification is useful for discussion regarding the chirality of molecular assemblies, on the basis of the conformationalchirality of the molecules in the crystal.
Redox-Neutral Cross-Coupling Amination with Weak <i>N-</i>Nucleophiles: Arylation of Anilines, Sulfonamides, Sulfoximines, Carbamates, and Imines via Nickelaelectrocatalysis
A nickel-catalyzed cross-coupling amination with weak nitrogen nucleophiles is described. Arylhalides as well as aryl tosylates can be efficiently coupled with a series of weak N-nucleophiles, including anilines, sulfonamides, sulfoximines, carbamates, and imines via concerted paired electrolysis. Notably, electron-deficient anilines and sulfonamides are also suitable substrates. Interestingly, when
Electrochemical synthesis of β-difluoromethylamide compounds by N-benzenesulfonylacrylamide with difluorine reagents
作者:Zhi-Long Lei、Zong-Cang Ding、Shu-Hui Li、Fei-Hu Cui、Hai-Tao Tang、Ying-Ming Pan
DOI:10.1039/d4cc02543a
日期:——
A mild and efficient electrochemical method for radical addition, cyclization, and migration reaction was described in this work. A difluoromethyl radical was produced by anodizing CF2HSO2Na. The resulting product was then added to olefin, underwent Smiles cyclization, and migrated to form β-difluoromethamide compounds after the release of SO2. The process was free from metals and catalysts, gram-grade
Cyclization Reactions of 2-Methylbenzenesulfonamides Using N,N-Dimethylcarbamoyl Chloride, N,N-Dimethylthiocarbamoyl Chloride, and N,N-Dimethylsulfamoyl Chloride
Generation of C,N-dianions (2) of 2-methylbenzenesulfonamides (1) followed by addition of N,N-dimethylcarbamoyl chloride gave 2-(N,N-dimethylcarbamoyl)methylbenzenesulfonamides (3), which were cyclized to 3,4-dihydro-2H-1,2-benzo[e]thiazin-3-one 1,1-dioxides (5). 3-Dimethylamino-2H-1,2-benzo)[e]thiazine. 1,1-dioxides (7) were obtained in one step by the reaction of 2 with N,N-dimethylthiocarbamoyl chloride. On the other hand, the reaction of 2 with N,N-dimethylsulfamoyl chloride yielded 2,2 ' -ethylene-bis(benzenesulfonamide)s (10) and / or 2,3-dihydro-1,2-benzothiazole 1,1-dioxides (11).
Cyclization of N-Aryl-N-tert-butoxycarbonyl-o-toluenesulfonamides to 2,3-Dihydro-1,2- benzisothiazole 1,1-Dioxides Accompanied by a Rearrangement of a tert-Butoxycarbonyl Group
Treatment of N-aryl-N-tert-butoxycarbonyl-omicron-toluenesulfonamides with tert-butyllithium in the presence of TMEDA followed by addition of N,N-dimethylsulfamoyl chloride gave 2-aryl-3-tert-butoxycarbonyl-2,3-dihydro-1,2-benzisothiazole 1,1-dioxides in moderate yields accompanied by a rearrangement of a tert-butoxycarbonyl group.