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
Synthesis of Sulfonamide-Based Ynamides and Ynamines in Water
作者:Lei Zhao、Hongyi Yang、Ruikun Li、Ye Tao、Xiao-Feng Guo、Edward A. Anderson、Andrew Whiting、Na Wu
DOI:10.1021/acs.joc.0c02326
日期:2021.1.15
Ynamides, though relatively more stable than ynamines, are still moisture-sensitive and prone to hydration especially under acidic and heating conditions. Here we report an environmentally benign, robust protocol to synthesize sulfonamide-based ynamides and arylynamines via Sonogashira coupling reactions in water, using a readily available quaternary ammonium salt as the surfactant.
Amide/Ester Cross-Coupling via C–N/C–H Bond Cleavage: Synthesis of β-Ketoesters
作者:Jiajia Chen、Devaneyan Joseph、Yuanzhi Xia、Sunwoo Lee
DOI:10.1021/acs.joc.0c02868
日期:2021.4.16
Activated primary, secondary, and tertiary amides were coupled with enolizable esters in the presence of LiHMDS to obtain good yields of β-ketoesters at room temperature. Notably, this protocol provides an efficient, mild, and high chemoselectivity method to synthesis of β-alkylketoesters using the cross-coupling between aliphatic amides and esters. Meanwhile, gram-scale secondary and primary amides reacted
Photochemical Desulfonylation of<i>N</i>-Tosyl Amides by 2-Phenyl-<i>N</i>,<i>N</i>′-Dimethylbenzimidazoline (PDMBI)
作者:Zhong-Li Liu、Wei Yu、Qiang Liu、Zhengang Liu、Yu-Lu Zhou、Wei Zhang、Li Yang
DOI:10.1055/s-2005-872693
日期:——
Photoinduced electron transfer reaction between N-tosyl amides and 2-phenyl-N,N′-dimethylbenzimidazoline (PDMBI) provides an efficient approach for the desulfonylation of N-tosyl amides.
Transacylation of N-acylsulfonamides, which replaces the N-acyl group with a new one, is a challenging and underdeveloped fundamental transformation. Herein, a general method for transacylation of N-acylsulfonamides is presented. The transformation is enabled by coincident catalytic reactivities of FeCl3 for nonhydrolytic deacylation of N-acylsulfonamides and subsequent acylation of the resultant sulfonamides