La(OTf)3 catalyzed synthesis of α-aryl tetrasubstituted pyrroles through [4+1] annulation under microwave irradiation
作者:Xue-Min Tan、Qiao-Mei Lai、Zhi-Wei Yang、Xiao Long、Hai-Lin Zhou、Xiao-Lin You、Xiao-Jie Jiang、Hai-Lei Cui
DOI:10.1016/j.tetlet.2016.11.122
日期:2017.1
A La(OTf)3 catalyzedsynthesis of tetrasubstituted pyrroles undermicrowaveirradiation has been developed affording various α-aryl tetrasubstituted pyrroles in acceptable to good yields (36–82% yield) through condensation/alkyne azacyclization/isomerization sequence. Functionalized α-aryl pentasubstituted pyrroles could be prepared from tetrasubstituted pyrroles through easy transformations.
has been developed from the cyclization of 2‐propynyl‐1,3‐dicarbonyl compoundscatalyzed by potassium tert‐butoxide, copper(II) trifluoromethanesulfonate and triphenylphosphine using methanol/dichloromethane as the solvent under very mild conditions. Moreover, dihydrofurans could be easily transformed into the corresponding furans in the presence of trifluoroacetic acid.