Chemoselective nitration of aromatic sulfonamides with tert-butyl nitrite
作者:Brenden Kilpatrick、Markus Heller、Steve Arns
DOI:10.1039/c2cc37481a
日期:——
A methodology for the efficient conversion of aromatic sulfonamides into their mono-nitro derivatives using tert-butyl nitrite is reported. The reaction exhibits a high degree of chemoselectivity for sulfonamide functionalized aryl systems, even in the presence of other sensitive or potentially reactive functionalities.
Palladium-Catalyzed Intramolecular Oxidative Coupling Involving Double C(sp<sup>2</sup>)–H Bonds for the Synthesis of Annulated Biaryl Sultams
作者:Joydev K. Laha、Krupal P. Jethava、Neetu Dayal
DOI:10.1021/jo5011334
日期:2014.9.5
The palladium-catalyzed intramolecular oxidative coupling described herein involves a doubleC(sp2)–H bond functionalization in sulfonanilides, providing a workable access to biaryl sultams annulated into a six-membered ring that are otherwise difficult to obtain by literature methods. The other synthetic applications of this protocol including the synthesis of biaryl sultams containing a seven-membered
Visible-Light Mediated <i>ortho</i>-Trifluoromethylation of Aniline Derivatives
作者:Chao Tian、Qiyue Wang、Xueqi Wang、Guanghui An、Guangming Li
DOI:10.1021/acs.joc.9b01987
日期:2019.11.1
trifluoromethylation of anilinederivatives by using a low-cost and stable Langlois reagent (CF3SO2Na) as the "CF3" source has been developed. In contrast to previous reports, this strategy allowed access to elusive trifluoromethyl lactams. Furthermore, mechanism experiments revealed that a copper/photoredox dual catalytic mechanism enabled general trifluoromethylation of anilinederivatives.
Visible-light-induced arylation<i>via</i>an electron–donor–acceptor complex: a catalyst-free approach for the synthesis of<i>N</i>-(hetero)aryl sulfonamides
作者:Arsala Kamal、Vandana Srivastava、Sundaram Singh
DOI:10.1039/d3nj02224b
日期:——
photoexcitation of aryl(hetero)diazonium salts and sulfonamides enabled this strategy under visible-light irradiation through an EDA complex used to carry out a one-step synthesis without a catalyst. This approach tolerated various functional groups of primary sulfonamides and (hetero)aryl diazonium salts, frequently found in modern medications and pharmacological intermediates. This method also enabled
An efficient palladium nanoparticles-catalyzed N-arylation of sulfonamides and sulfonyl azides is described. This procedure serves as an active protocol for intermolecular C–N bond formation using Pd(OAc)2 in PEG-400 under air. Aryl bromides and triflates react at 35°C, while aryl chlorides require heating to 50°C and give the desired products only in low yields. This reaction proceeds smoothly in