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
摘要:
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.
Efficient Manganese/Copper Bimetallic Catalyst for<i>N</i>-Arylation of Amides and Sulfonamides Under Mild Conditions in Water
作者:Yong-Chua Teo、Fui-Fong Yong、Idzham Khalid Ithnin、Siew-Hui Trionna Yio、Zhiyin Lin
DOI:10.1002/ejoc.201201218
日期:2013.1
An efficient and mild method using a bimetallic MnF2/CuI catalyst at 60 °C in water was developed for the N-arylation of amides and sulfonamides with aryl halides. A variety of functionalized amides and sulfonamides were coupled with different substituted aryl halides to afford the corresponding N-arylated products in good to excellent yields (up to 97 %).
开发了一种在 60 °C 下在水中使用双金属 MnF2/CuI 催化剂的有效且温和的方法,用于酰胺和磺酰胺与芳基卤化物的 N-芳基化。各种官能化酰胺和磺酰胺与不同的取代芳基卤化物偶联,以良好至极好的产率(高达 97%)提供相应的 N-芳基化产物。
Efficient Ligand-Free, Copper-Catalyzed N-Arylation of Sulfonamides
作者:Yong-Chua Teo、Fui-Fong Yong
DOI:10.1055/s-0030-1259925
日期:2011.4
An efficient and convenient protocol has been developed for the N-arylation of sulfonamides with differently substituted aryl iodides using ligand-free copper iodide to afford the arylated products in good to excellent yields (up to 91%).
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).