Synthesis of Alkenylboronates from <i>N</i>-Tosylhydrazones through Palladium-Catalyzed Carbene Migratory Insertion
作者:Yifan Ping、Rui Wang、Qianyue Wang、Taiwei Chang、Jingfeng Huo、Ming Lei、Jianbo Wang
DOI:10.1021/jacs.1c02331
日期:2021.7.7
The palladium-catalyzed oxidative borylation reaction of N-tosylhydrazones has been developed. The reaction features mild conditions, broad substratescope, and good functional group tolerance. It thus represents a highly efficient and practical method for the synthesis of di-, tri-, and tetrasubstituted alkenylboronates from readily available N-tosylhydrazones. One-pot Suzuki coupling and other transformations
NNNifty targets: In a straightforward copper‐mediated synthesis of 1,4‐disubstituted and 1,4,5‐trisubstituted 1,2,3‐triazoles, readily available aniline and N‐tosylhydrazone substrates underwent cyclization through CN and NN bond formation (see scheme; Piv=pivaloyl, Ts=p‐toluenesulfonyl). This method enables the preparation of 1,2,3‐triazoles with high efficiency under mild conditions without the
Copper-Catalyzed Radical Reaction of <i>N</i>-Tosylhydrazones: Stereoselective Synthesis of (<i>E</i>)-Vinyl Sulfones
作者:Shuai Mao、Ya-Ru Gao、Xue-Qing Zhu、Dong-Dong Guo、Yong-Qiang Wang
DOI:10.1021/acs.orglett.5b00461
日期:2015.4.3
radical reaction to synthesize vinylsulfones from readily available N-tosylhydrazones has been described. The protocol provides a novel strategy for the synthesis of various vinylsulfones including α, β-disubstituted ones and terminal ones. The advantages of the transformation include excellent E stereoselectivity, broad substrate scope, low cost of reagents, and convenient operation. A novel and efficient
Pd-Catalyzed Alkenyl Thioether Synthesis from Thioesters and <i>N</i>-Tosylhydrazones
作者:Kota Ishitobi、Kei Muto、Junichiro Yamaguchi
DOI:10.1021/acscatal.9b04212
日期:2019.12.6
A Pd-catalyzed alkenyl thioethersynthesis was achieved using thioesters and N-tosylhydrazones as starting materials. The thioester acted as an efficient “sulfur source” for catalytic C–S bond formation using N-tosylhydrazone. This method gave Z-alkenyl thioethers with high diastereoselectivity (up to 99:1 diastereomeric ratio). This transformation displayed a wide functional group tolerance and was
A visible-light-driven and room temperature photo-Wolff-Kischner reaction of sulfur ylides and N-tosylhydrazones has been developed for the first time to provide modular access to alkene synthesis. The high functional group tolerance and broad substrate scope were demonstrated by more than 60 examples. Both E- and Z-olefinic stereochemistry in the products could be controlled with excellent stereoselectivity