A rare-earth salt Yb(OTf)3-catalyzed regioselective hydroamination of ynamides with anilines and p-toluenesulfonamide has been developed. This protocol provided facile access to a diverse range of amidines with good functional group tolerance in moderate to high yields.
The synthesis of ynamides in water was achieved by a micellarcatalysis strategy using rosin‐based surfactant APGS‐550‐M, which can be easily prepared from natural abundant biomass.
Copper-Mediated Selective Cross-Coupling of 1,1-Dibromo-1-alkenes and Heteronucleophiles: Development of General Routes to Heterosubstituted Alkynes and Alkenes
site-selective, double, or alkynylative cross-coupling, therefore providing divergent and straightforward entries to numerous building blocks such as bromoenamides, ynamides, ketene N,N-acetals, bromoenol ethers, ynol ethers, keteneO,O-acetals, or vinylphosphonates and further expanding the copper catalysis toolbox with useful and versatile processes.
Highly Selective <i>Syn</i>
Addition of 1,3-Diones to Internal Ynamides Catalyzed by Zinc Iodide
作者:Rémi Plamont、Lionel V. Graux、Hervé Clavier
DOI:10.1002/ejoc.201701690
日期:2018.3.22
used as nucleophiles to perform additions to ynamides, highly selective hydroalkoxylation of internal ynamides is now described herein. Several catalytic systems were compared to carry out this transformation including transition metal-based catalysts or Lewis acids. ZnI2 was found to be both very active and highly selective giving only E adducts through a syn addition. Scope and limits investigation
Metal‐Free Hydrophosphoryloxylation of Ynamides: Rapid Access to Enol Phosphates
作者:Dalie An、Weinan Zhang、Bin Pan、Yingying Zhao
DOI:10.1002/ejoc.202001335
日期:2021.1.15
An addition reaction between phosphoric acids and ynamides was developed for the synthesis of amino‐derived enolphosphates. The protocol features metal‐free conditions, exclusive selectivity, short reaction times, and easy scale‐up. Notably, the resulting products could easily undergo Suzuki‐Miyaura cross‐coupling at room temperature.