DIASTEREOSELECTIVE COMPLEXATION OF TEMPORARILY CHIRALLY MODIFIED LIGANDS - ENANTIOSELECTIVE PREPARATION AND CONFIGURATIONAL ASSIGNMENT OF SYNTHETICALLY VALUABLE ETA-6-TRICARBONYLCHROMIUM-1-TETRALONE DERIVATIVES

A three-step reaction sequence-enantioselectively catalyzed reduction (1 --> 2), diasteroselective complexation (2 --> 3), and reoxidation (3 --> 4)-enables the efficient transformation of achiral 1-tetralone derivatives 1 into the corresponding chiral, nonracemic eta(6)-tricarbonylchromium complexes. These complexes, which are thus accessible in selectable absolute configurations with 85-94% ee, are valuable building blocks for the synthesis of biologically active compounds (R1 - R3 = H, OMe).