Indirect regioselective heteroarylation of indoles through a Friedel–Crafts reaction with (E)-1,4-diaryl-2-buten-1,4-diones
摘要:
A two-step synthesis of 3-heteroaryl indoles has been developed. The first step of the sequence involves a Friedel-Crafts alkylation of indoles with 1,4-diaryl-2-buten-1,4-diones to give the corresponding indoles bearing a 1,4-dicarbonyl moiety. The reaction is catalyzed by InCl3 and takes place with good yields. Cyclization of the diones under different Paal-Knorr conditions allows to prepare indoles substituted at the C3 position with 3-furanyl, 3-pyrrolyl- and 3-thienyl moieties. (c) 2009 Elsevier Ltd. All rights reserved.
Indirect regioselective heteroarylation of indoles through a Friedel–Crafts reaction with (E)-1,4-diaryl-2-buten-1,4-diones
作者:Gonzalo Blay、Isabel Fernández、Alicia Monleón、José R. Pedro、Carlos Vila
DOI:10.1016/j.tet.2009.09.011
日期:2009.11
A two-step synthesis of 3-heteroaryl indoles has been developed. The first step of the sequence involves a Friedel-Crafts alkylation of indoles with 1,4-diaryl-2-buten-1,4-diones to give the corresponding indoles bearing a 1,4-dicarbonyl moiety. The reaction is catalyzed by InCl3 and takes place with good yields. Cyclization of the diones under different Paal-Knorr conditions allows to prepare indoles substituted at the C3 position with 3-furanyl, 3-pyrrolyl- and 3-thienyl moieties. (c) 2009 Elsevier Ltd. All rights reserved.