The direct proline-catalyzedasymmetric α-aminoxylation of aldehydes and ketones has been developed using nitrosobenzene as an oxygen source, affording α-anilinoxy-aldehydes and -ketones with excellent enantioselectivity. Reaction conditions have been optimized, and low temperature (−20 °C) was found to be a key for the successful α-aminoxylation of aldehydes, while slow addition of nitrosobenzene
Highly Enantioselective α-Aminoxylation of Aldehydes and Ketones in Ionic Liquids
作者:Kun Huang、Zhi-Zhen Huang、Xin-Liang Li
DOI:10.1021/jo061507g
日期:2006.10.1
As the first example for the synthesis of optically active α-hydroxyaldehydes and α-hydroxyketones in ionicliquids, we applied RTILs into l-proline catalyzed direct enantioselective α-aminoxylation of both aldehydes and ketones successfully. This protocol features a number of advantages, such as recycling of green solvents and chiral organocatalyst, high yields, excellent enantioselectivities, short