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.
Gold‐Catalyzed Intermolecular [4+2] Annulation of 2‐Ethynylanilines with Ynamides: An Access to Substituted 2‐Aminoquinolines
作者:Ximei Zhao、Xinlong Song、Hongming Jin、Zhongyi Zeng、Qian Wang、Matthias Rudolph、Frank Rominger、A. Stephen K. Hashmi
DOI:10.1002/adsc.201800341
日期:2018.7.16
A gold‐catalyzedintermolecular [4+2] annulation of easily accessible 2‐ethynylanilines with ynamides offers a highly region‐selective, modular, efficient, and atom‐economical strategy for the synthesis of substituted2‐aminoquinolines in up to 93% yield.
A formal [3 + 2] cycloaddition between ynamides and unprotected isoxazol-5-amines has been developed in the presence of catalytic AgNTf2 in an open flask. By the protocol, a variety of functionalized 5-amino-1H-pyrrole-3-carboxamide derivatives can be obtained in up to 99% yield. The reaction mechanism might involve the generation of an unusual α-imino silver carbene intermediate (or a silver-stabilized
<i>N</i>-Pyridinyl Sulfilimines as a Source for α-Imino Gold Carbenes: Access to 2-Amino-Substituted <i>N</i>-Fused Imidazoles
作者:Xianhai Tian、Lina Song、Matthias Rudolph、Qian Wang、Xinlong Song、Frank Rominger、A. Stephen K. Hashmi
DOI:10.1021/acs.orglett.9b00140
日期:2019.3.15
ynamides is reported. A diverse set of imidazole derivatives is prepared from the corresponding sulfilimines and ynamides. These functionalized cyclic products can undergo further transformations to afford diverse imidazole frameworks. Moreover, in situ synthesis is feasible and shows good potential in the synthesis of nucleoside analogues.
Direct Hydroheteroarylation of Ynamides with 2<i>H</i>
-Tetrazoles: Regio- and Stereoselective Synthesis of (<i>Z</i>
)-<i>α</i>
-Tetrazole Enamides
作者:Jiekun Zhu、Qingbo Wang、Xin Meng、Changyin Zhao、Xuejun Sun、Laijin Tian、Ziping Cao
DOI:10.1002/ejoc.201900604
日期:2019.7.7
Ynamides react with 2H‐tetrazoles in the absence of any catalyst, providing a variety of (Z)‐α‐tetrazole enamides efficiently. The reaction proceeds via a key keteniminium intermediate, leading to the formation of C‐N bonds. It features simple experimental operations and mild reaction conditions, high chemo‐, regio‐ and stereoselectivities, and high reaction efficiencies.