A General Copper-Catalyzed Synthesis of Ynamides from 1,2-Dichloroenamides
作者:Steven J. Mansfield、Russell C. Smith、Jonathan R. J. Yong、Olivia L. Garry、Edward A. Anderson
DOI:10.1021/acs.orglett.9b00971
日期:2019.4.19
Ynamides are accessed via copper-catalyzed coupling of Grignard or organozinc nucleophiles with chloroynamides, formed in situ from 1,2-dichloroenamides. The reaction exhibits a broad substrate scope, is readily scaled, and overcomes typical limitations in ynamide synthesis such as the use of ureas, carbamates, and bulky or aromatic amide derivatives. This modular approach contrasts with previous routes
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.
Generation of gold carbenes in water: efficient intermolecular trapping of the α-oxo gold carbenoids by indoles and anilines
作者:Long Li、Chao Shu、Bo Zhou、Yong-Fei Yu、Xin-Yu Xiao、Long-Wu Ye
DOI:10.1039/c4sc00983e
日期:——
efficient intermolecular reaction of gold carbene intermediates, generated via gold-catalyzedalkyneoxidation, with indoles and anilines has been realized in aqueous media. Importantly, it was revealed for the first time that water could dramatically suppress the undesired over-oxidation, providing a general and practical solution to the problem of over-oxidation in gold-catalyzedintermolecular alkyne
Catalytic Ynamide Oxidation Strategy for the Preparation of α-Functionalized Amides
作者:Fei Pan、Xin-Ling Li、Xiu-Mei Chen、Chao Shu、Peng-Peng Ruan、Cang-Hai Shen、Xin Lu、Long-Wu Ye
DOI:10.1021/acscatal.6b01599
日期:2016.9.2
acid-catalyzed alkyne oxidation strategy has been developed to produce diverse α-functionalized amides from readily and generally available ynamides. An efficient zinc(II)-catalyzed oxidative azidation and thiocyanation has been achieved, providing facile access to synthetically useful α-azido amides and α-thiocyanate amides, respectively. This chemistry can also be extended to oxidative halogenations by employing