The natural enzyme cytochrome P450 is widely recognised for its unique ability to catalysehighlyselective oxygen insertion reactions into unactivated C–H bonds under mild conditions. Its exceptional potential for organic synthesis served as an inspiration for the presented biomimetic hydroxylation approach. Via a remote hydrogen bonding motif a high enantioselectivity in the manganese-catalysed oxygenation
Compounds of formula (I):
wherein R
1
, R
2
, R
3
, R
4
, R
5
, Z and n have defined meanings, the N-oxide forms, the pharmaceutically acceptable addition salts, the quaternary ammonium salts and the stereochemically isomeric forms thereof, and their use for the treatment of PARP-mediated disorders.