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A Stable and Recoverable Chiral Ru Lewis Acid: Synthesis,Asymmetric Diels–Alder Catalysis and Structure of the Lewis Acid Methacrolein Complex |
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| Authors: | E Peter Kündig Christophe M Saudan Grald Bernardinelli |
| Abstract: | Ease of generation , stablity in solution at ambient temperature, high enantioselectivity in Diels–Alder reactions, efficient catalyst recovery, and large rate differences on variation of the anion are all characteristics of the new Ru Lewis acid CpRu((S,S)-biphop-F)]+ (biphop-F=(C6F5)2POCH2(Ph)CH2(Ph)OP(C6F5)2). The structure of complex 1 (L=methacrolein, Y=SbF6) provides evidence for a cooperative binding of the dienophile by both the Lewis acid and the anion. |
| Keywords: | Asymmetric catalysis Cycloadditions Lewis acids P ligands Ruthenium |