A mild and efficient AgSbF6-catalyzed synthesis of fully substituted pyrroles through a sequential propargylation/amination/cycloisomerization reaction
fully substitutedpyrroles via a sequential propargylation/amination/cycloisomerization was accomplished using AgSbF6 as a catalyst. The one-pot three-componentreaction of propargylic alcohols, 1,3-dicarbonyl compounds, and primary amines proceeds at a mild temperature, which prevents the formation of furan by-product. The reaction was also successfully applied to the more basic aliphatic amines with
An efficient FeCl3-catalyzed tandem propargylation-cycloisomerization reaction of propargylic alcohols or acetates with 1,3-dicarbonyl compounds, leading to the synthesis of substituted furans, has been developed.
FeCl<sub>3</sub>-Catalyzed Nucleophilic Substitution of Propargylic Acetates with Enoxysilanes
作者:Zhuang-ping Zhan、Xu-bin Cai、Shao-pei Wang、Jing-liang Yu、Hui-juan Liu、Yuan-yuan Cui
DOI:10.1021/jo701782g
日期:2007.12.1
[Graphics]An efficient FeCl3-catalyzed substitution reaction of propargylic acetates with enoxysilanes under mild conditions to afford corresponding gamma-alkynyl ketones has been developed. The substitution reaction is followed by a TsOH-catalyzed cyclization without purification of the gamma-alkynyl ketone intermediates, offering a straightforward synthetic route to tri- or tetrasubstituted furans.