Conclusion
In summary, we have realized the enantioselective synthesis ofγ -chirogenic amine derivatives via the asymmetric hydrogenation of γ -branched N -phthaloyl allylamines. A bisphosphine-Rh complex bearing a large bite angle was employed to provide the desired products with satisfactory yields and excellent enantioselectivities (up to >99% ee). This protocol was further applied to the preparation of some important pharmaceutical compounds, including the well-known antidepressant drug Fluoxetine (up to 50000 S/C). A nearly linear P-RhIII-P coordination pattern and a weak interaction-promoted substrate-coordination activation mode, both of which are unusual in the bidentate bisphosphine-Rh-catalyzed hydrogenation, have been found according to the mechanism calculation.
Experimental Section
(R )-SKP ligand (0.59 mg, 0.0021 mmol) and [Rh(cod)2]SbF6 (1.11 mg, 0.002 mmol) were dissolved in anhydrous and degassed EtOAc (2 mL) under nitrogen. The mixture was allowed to stir for 30 min at room temperature. The substrate (0.2 mmol) was placed in a 5.0 mL tube equipped with a magnetic stirrer bar. This tube was placed in an autoclave. The pre-prepared solution of catalyst was added under a nitrogen atmosphere. After purging with hydrogen three times, the hydrogen pressure was finally pressurized to 50 bar. The reaction mixture was vigorously stirred at room temperature for 12 h. The conversion of the product was determined by 1H NMR spectroscopic analysis of the crude reaction mixture and the yield was calculated after isolation by flash chromatography. The ee value was determined by chiral HPLC.
Acknowledgements
This work was supported by National Key R&D Program of China (No. 2018YFE0126800), National Natural Science Foundation of China (Nos. 21620102003, 21831005, 91856106, 21991112, 22071150), and Shanghai Municipal Education Commission (No. 201701070002E00030). We also thank the Instrumental Analysis Center of Shanghai Jiao Tong University.
Keywords: asymmetric hydrogenation • bisphosphine ligand • SKP • chiral amines • allylamines
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