作者:Chuanjun Song、David W. Knight、Maria A. Whatton (neé Fagan)
DOI:10.1016/j.tetlet.2004.10.133
日期:2004.12
N-Tosylpyrroles can be very efficiently converted into the corresponding 2-acylpyrroles by reaction with carboxylic acids and trifluoroacetic anhydride; little or none of the isomeric 3-acyl derivatives are formed.
Chemoselective reduction of 2-acyl-N-sulfonylpyrroles: Synthesis of 3-pyrrolines and 2-alkylpyrroles
作者:Hai Tao You、Andrew C. Grosse、James K. Howard、Christopher J. T. Hyland、Jeremy Just、Peter P. Molesworth、Jason A. Smith
DOI:10.1039/c1ob05111c
日期:——
The partial reduction of pyrroles is not a common practice even though it offers a potential route to pyrroline building blocks, commonly used for synthesis. We have investigated the reduction of 2-acyl-N-sulfonylpyrroles and by varying the hydride source and solvent, achieved a chemoselective reduction, leading to 3-pyrrolines and alkyl pyrroles in high yield.
The substituenteffects of aryl groups at the 5,10-positions of dianilinotripyrrins were investigated. The dimerization association constant in pentafluorophenyl-substituted dianilinotripyrrin is significantly decreased due to the enforced planarity in the tripyrrin core.