A heterotrimetallic Pd–Sm–Pd complex for asymmetric Friedel–Crafts alkylations of pyrroles with nitroalkenes
作者:Guoqi Zhang
DOI:10.1039/c2ob25074h
日期:——
Catalytic asymmetric FriedelâCrafts alkylations of pyrroles and nitroalkenes were carried out by using a novel heterotrimetallic PdâSmâPd catalyst based on a simple chiral ligand 1, to give the adducts with high yields and up to 93% ee.
Asymmetric Friedel−Crafts Alkylation of Pyrroles with Nitroalkenes Using a Dinuclear Zinc Catalyst
作者:Barry M. Trost、Christoph Müller
DOI:10.1021/ja711080y
日期:2008.2.1
The catalytic enantioselective and atom economic Friedel-Crafts alkylation of pyrroles with nitroalkenes under mild reaction conditions using a dinuclear zinc catalyst is reported. The versatility of the reaction is demonstrated by the conversion of a number of differentially substituted nitroalkenes with differentially substituted pyrroles. Tandem addition reactions to form 2,5-disubstituted pyrroles are also demsonstrated. All pyrrole alkylations have been carried out without using N-protecting groups, which also enhances the efficiency by which substituted pyrroles may be synthesized. The reactions result in good yields and excellent enantioselectivities.
Enantioselective Michael Addition of Pyrroles with Nitroalkenes in Aqueous Media Catalyzed by a Water-Soluble Catalyst
作者:Yang Gui、Yanan Li、Jianan Sun、Zhenggen Zha、Zhiyong Wang
DOI:10.1021/acs.joc.8b01141
日期:2018.7.20
A new water-soluble catalytic system was developed and used in an enantioselectiveMichaeladdition of pyrroles with nitroalkenes in water to afford nitroethylpyrrole derivatives with both excellent yields and ee values.