| 초록 |
As part of our continuing effort in the design and the synthesis of new ferrocene-based chiral ligands for asymmetric catalysis, we have undertaken the preparation of chiral iminophosphoranes derived from FA with arylazide. We now wish to put into entry a new family of chiral iminophosphoranes such as those illustrated in Scheme 1. We anticipated that these compounds should act as tightly binding chelates and thus would be capable of stabilizing metal centers involved in catalytic cycles, even in rather low oxidation states. Furthermore, as sterically demanding and robust chelates, they are supposed to accomplish higher optical inductions in asymmetric reactions. The product was fully characterized by analytical and various spectroscopic techniques. In particular, a complete assignment of all protons and phosphorus was made by various NMR techniques. |
