Copper-Catalyzed Chemoselective and Enantioselective Friedel–Crafts 1,2-Addition of Pyrrole with β,γ-Unsaturated α-Ketoesters
作者:Jianan Sun、Yanbin Hu、Yanan Li、Sheng Zhang、Zhenggen Zha、Zhiyong Wang
DOI:10.1021/acs.joc.7b00159
日期:2017.5.19
A Friedel–Crafts alkylation of pyrrole was developed to afford the β,γ-unsaturated α-hydroxy esters bearing a quaternary stereogenic center with good enantioselectivities and yields. This protocol represents the first report of 1,2-addition of Friedel–Crafts alkylation of pyrrole to β,γ-unsaturatedα-ketoesters.
Copper Catalyzed Enantioselective Alkylation of Pyrrole with β,γ-Unsaturated α-Ketoesters: Application to One-Pot Construction of the Seven-Membered Ring by Merging a Gold Catalysis
作者:Yanbin Hu、Yanan Li、Sheng Zhang、Chong Li、Lijun Li、Zhenggen Zha、Zhiyong Wang
DOI:10.1021/acs.orglett.5b01917
日期:2015.8.21
A highly enantioselective Friedel Crafts alkylation of pyrrole to beta,gamma-unsaturated alpha-ketoesters was developed by virtue of a chiral copper complex, affording the alkylated derivatives of pyrrole with good yields and excellent enantioselectivities. Moreover, merging copper catalysis with gold catalysis realized a one-pot construction of the seven-membered ring to give annulated pyrroles with moderate to good yields and high enantiomeric excesses.