Citation:
ZHANG Baohua, SHI Lanxiang. Asymmetric Henry Condensation Catalyzed by Ionic Liquid-supported Proline[J]. Chinese Journal of Applied Chemistry,
;2014, 31(7): 812-816.
doi:
10.3724/SP.J.1095.2014.30480
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A functionalized ionic liquid-supported proline,1-methyl-3-{2-[(2s)-pyrrolidine-2-carbonyloxy]-ethyl}-1H-imidazol-3-iumtrifluoroacetate([Promim]CF3CO2),was used to catalyze the Henry condensation reaction of aldehydes with CH3CH2NO2 or CH3NO2.The desired products were obtained in 79%~95% yields,diastereomeric excess and enantiomeric excess was up to 3:1 and 85% under relatively mild conditions.[Promim]CF3CO2 could be efficiently recycled six times without the decrease of catalytic activity in the condensation reaction of 4-nitrobenzaldehyde and CH3CH2NO2.
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