The present invention relates to electronic devices, in particular organic electroluminescent devices, comprising compounds of the formula (1), to the corresponding compounds, and to a process for the preparation of these compounds.
N-C axially chiral phenanthridin-6-one derivatives bearing various ortho-substituted phenyl groups on the nitrogen atom were enantioselectively prepared through (R)-DTBM-SEGPHOS-Pd(OAc)(2)-catalyzed intramolecular Buchwald-Hartwig amination. The enantioselectivity strongly depended on solvents, bases, and reaction temperature as well as on the bulkiness of ortho-substituents.
MINTAS, MHADEN;MIHALJEVIC, VESNA;KOLLER, HELMUT;SCHUSTER, DORIS;MANNSCHRE+, J. CHEM. SOC. PERKIN TRANS. PT 2,(1990) N, C. 619-624