A highly regioselective sonogashira coupling as a key step in the preparation of the first phenanthroline with two diverse reactive groups in 3,8-positions
The preparation of 3,8-unsymmetric phenanthrolines is described. Desymmetrization of 3,8-dibromophenanthroline was achieved after monoarylation followed by regioselective Pd-catalyzed monoalkynylation that was controlled by the methoxy group of the dimethoxyphenyl substituent.
Liu
SX
Organische Chemie 1, FB 8, Universitat Siegen, Adolf-Reichwein-Strasse, D-57068 Siegen, Germany.
Michel
C
Schmittel
M