Reactions of organic anions. Part 110. Vicarious nucleophilic substitution of hydrogen in nitroarenes with .alpha.-substituted nitriles and esters. Direct .alpha.-cyanoalkylation and .alpha.-carbalkoxyalkylation of nitroarenes
Selective Double Functionalization ofmeso-Tetraphenylporphyrin Complexes on the Same Pyrrole Unit by Tandem Electrophilic/Nucleophilic Aromatic Substitution
作者:Stanisław Ostrowski、Anna M. Raczko
DOI:10.1002/hlca.200590091
日期:2005.5
The mono-nitrated meso-tetraphenylporphyrin (TPP) complex 2 could be readily functionalized on the substituted pyrrole ring with yields of up to 83%. These transformations were achieved via aromatic substitution with carbanions generated from diverse functionalized compounds containing different leaving groups (3a–g, Scheme 1). The resulting TPP compounds 4a–g, bearing two different β-substituents