Palladium-catalysed aminosulfonylation of aryl-, alkenyl- and heteroaryl halides: scope of the three-component synthesis of N-aminosulfonamides
作者:Edward J. Emmett、Charlotte S. Richards-Taylor、Bao Nguyen、Alfonso Garcia-Rubia、Barry R. Hayter、Michael C. Willis
DOI:10.1039/c2ob07034k
日期:——
By using DABCO·(SO2)2, DABSO, as a solid bench-stable SO2-equivalent, the palladium-catalysed aminosulfonylation of aryl-, alkenyl- and heteroaryl halides has been achieved. N,N-Dialkylhydrazines are employed as the N-nucleophiles and provide N-aminosulfonamides as the products in good to excellent yields. The reactions are operationally simple to perform, requiring only a slight excess of SO2 (1.2–2.2 equiv.), and tolerate a variety of substituents on the halide coupling partner. Variation of the hydrazine component is also demonstrated. The use of N,N-dibenzylhydrazine as the N-nucleophile delivers N-aminosulfonamide products that can be converted into the corresponding primary sulfonamides using a high-yielding, telescoped, deprotection sequence. The ability to employ hydrazine·SO2 complexes as both the N-nucleophile and SO2 source is also illustrated.
A palladium-catalyzed three-component coupling of arylboronic acids, sulfur dioxide and hydrazines
作者:Shengqing Ye、Jie Wu
DOI:10.1039/c2cc33725h
日期:——
to aryl N-aminosulfonamides via a palladium-catalyzed three-component coupling of arylboronic acids, sulfurdioxide and hydrazines in the presence of a balloon of dioxygen is reported. The reaction proceeded smoothly under mild conditions and DABCO.(SO(2))(2) was used as the source of sulfurdioxide.
A palladium-catalyzed reaction of aryl halides, potassium metabisulfite, and hydrazines
作者:Shengqing Ye、Jie Wu
DOI:10.1039/c2cc34957d
日期:——
Aryl N-aminosulfonamides could be easily produced via a palladium-catalyzed coupling of aryl halides, potassium metabisulfite, and hydrazines. Potassium metabisulfite is an excellent equivalent of sulfur dioxide in the reaction of palladium-catalyzed aminosulfonylation.
Aminosulfonylation of aromatic amines, sulfur dioxide and hydrazines
作者:Danqing Zheng、Ying Li、Yuanyuan An、Jie Wu
DOI:10.1039/c4cc03032j
日期:——
A facile route to aryl N-aminosulfonamides under mild conditions is provided. The reaction of aromatic amines (including heteroaromatic amines), sulfurdioxide, and hydrazines proceeds efficiently with good functional group tolerance. The in situ generated diazonium ion is involved in the aminosulfonylation process.
Palladium-Catalyzed Aminosulfonylation of Aryl Halides
作者:Bao Nguyen、Edward J. Emmett、Michael C. Willis
DOI:10.1021/ja1081124
日期:2010.11.24
The palladium-catalyzed three-component coupling of aryl iodides, sulfur dioxide, and hydrazines to deliver aryl N-aminosulfonamides is described. The colorless crystalline solid DABCO center dot(SO2)(2) was used as a convenient source of sulfur dioxide. The reaction tolerates significant variation of both the aryl iodide and hydrazine coupling partners.