β-unsaturated N-tosylamides via N-sulfonyl ketenimine formation followed by a probable 1,3-OAc migration ([3,3]-sigmatropic rearrangement). The reaction is very general, allowing all kinds of substitution, including alkyl, aryl (electron-donating, -withdrawing, and -neutral), heteroaryl, and vinylgroups, on the C-terminal of acrylamide. Also, the method affords the products at ambient temperature
Tandem Copper-Catalyzed Propargylation/Alkyne Azacyclization/Isomerization Reaction under Microwave Irradiation: Synthesis of Fully Substituted Pyrroles
A copper-catalyzed and microwave-assisted synthesis of fully substituted pyrroles has been developed. A series of pentasubstituted pyrroles, especially α-arylpyrroles, could be obtained in moderate to good yields (up to 93%) through a tandem propargylation/alkyne azacyclization/isomerization sequence from readily available β-enamino compounds and propargyl acetates.
Copper-Catalyzed Synthesis of Furo[3,2-c]coumarins and Dihydrofuro[3,2-c]coumarins through a Propargylation/Alkyne Oxacyclization/Isomerization Cascade under Microwave Irradiation
作者:Jian-Wu Xie、Hai-Lei Cui、Xiao-Yan Zhang、Li-Li Hu、Ze Shen、Zhong-Zhu Chen、Zhi-Gang Xu、Shi-Qiang Li
DOI:10.1055/s-0035-1560500
日期:——
A novel copper-catalyzed microwave-promoted propargylation/alkyne oxacyclization/isomerization cascade for the synthesis of 2-methylfuro[3,2-c]coumarins has been developed. This reaction provides furo[3,2-c]coumarins in moderate to good yields (≤82%) from readily available 4-hydroxycoumarins and terminal propargyl acetates as starting materials. Interestingly, by changing the solvent from dimethyl
Difluorocarbene generated from FSO2CF2CO2SiMe3 (TFDA) at 120 °C could reacted with terminalalkynes having an ester group at the αposition to the triplebond. Difluorocyclopropenes were further converted to difluorocyclopropyl ketones under alkaline condition. Mechanism for the conversion was studied.
由FSO 2 CF 2 CO 2 SiMe 3(TFDA)在120°C下生成的二氟卡宾可以与在三键的α位具有酯基的末端炔烃反应。在碱性条件下,将二氟环丙烯进一步转化为二氟环丙基酮。研究了转化机理。
Synthesis of quinolines through copper-catalyzed intermolecular cyclization reaction from anilines and terminal acetylene esters
作者:Zhilei Zheng、Guobo Deng、Yun Liang
DOI:10.1039/c6ra23858k
日期:——
A simple and convenient copper-catalyzed intermolecular cyclization reaction for the synthesis of quinolines from anilines and terminal acetylene esters has been developed. This methodology constructs the C–N and C–C bonds successively via a cascade process, and provides the desired products in moderate to good yields.