应用
Highly Enantioselective Diels-Alder Reactions using Bode 2 Catalyst
References
- 1)M. He, J. R. Struble, J. W. Bode, J. Am. Chem. Soc. 2006, 128, 8418.
- 2)M. He, G. J. Uc, J. W. Bode, J. Am. Chem. Soc. 2006, 128, 15088.
- 3)J. R. Struble, J. W. Bode, Y. Lian, H. M. L. Davies, Org. Synth. 2010, 87, 362.
应用
[4+2] Cycloaddition of α,β-Unsaturated Aldehydes with Chalcones Using NHC (Bode Catalyst 2) and Acid Co-catalyst
Typical procedure (entry 1):
A dry 10 mL Schlenk tube is successively charged with 4-methoxycinnamaldehyde (81 mg, 0.5 mmol), chalcone (52 mg, 0.25 mmol), Bode catalyst 2 monohydrate (18.4 mg, 0.05 mmol), KOAc (61.4 mg, 0.625 mmol) and MS4Å (100 mg). The tube is closed with a septum, evacuated, and refilled with nitrogen. To this mixture is added distilled THF (0.5 mL), followed by AcOH (7.2 µL, 0.0625 mmol). The reaction mixture is stirred at room temperature for 24 h. After the reaction is completed, the solvent is removed under reduced pressure. The residue is purified by column chromatography on silica gel (eluent: hexane/ethyl acetate = 10/1) to afford the corresponding lactone (79.6 mg, 86% yield, 20:1 dr, 99% ee) as a white solid.
References
PubMed Literature