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 Tandem Cycloisomerization/Functionalization of in Situ Generated α-Oxo Gold Carbenes in Water
作者:Cang-Hai Shen、Long Li、Wei Zhang、Shuang Liu、Chao Shu、Yun-Er Xie、Yong-Fei Yu、Long-Wu Ye
DOI:10.1021/jo501872h
日期:2014.10.3
A gold-catalyzed tandem cycloisomerization/functionalization of in situ generated α-oxo gold carbenes in water has been developed, which provides ready access to highly functionalized indole derivatives from o-alkynyl anilines and ynamides. Importantly, gold serves dual catalytic roles to mediate both the cycloisomerization of o-alkynyl anilines and the intermolecular oxidation of ynamides at the same
Coupling and cycloaddition of ynamides: homo- and Negishi coupling of tosylynamides and intramolecular [4+2] cycloaddition of N-(o-ethynyl)phenyl ynamides and arylynamides
tosylamides derivatives with (hetero)aryl iodides in the presence of Pd2dba3 and triphenylphosphine affords N-aryl and N-alkyl arylynamides in yields of up to 90%. Intramolecular [4+2] cycloaddition reactions of N-ethynylphenyl ynamides and arylynamides allow the synthesis of carbazoles and benzannulated and heteroannulated carbazoles in moderate-to-good yields.
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
Negishi coupling of terminal alkynyl amides with (hetero)aryl iodides in the presence of Pd2dba3 and triphenylphosphine affords new alkynyl amides in yields of up to 90%.