A New Robust and Efficient Ion-Tagged Proline Catalyst Carrying an Amide Spacer for the Asymmetric Aldol Reaction
作者:Elisa Montroni、Shrihari P. Sanap、Marco Lombardo、Arianna Quintavalla、Claudio Trombini、Dilip D. Dhavale
DOI:10.1002/adsc.201100595
日期:2011.11
cis-ion-tagged catalyst (8a), possessing an amide linkage between the imidazolium tag and the proline ring, is described. This new bench-stable catalyst has been tested in the classic asymmetric aldol condensation between ketones and aldehydes “in the presence” of water, and is proposed as a valuable alternative to the analogous but more sensitive ester cis-2d. Catalyst 8a displayed an excellent efficiency
描述了一种新型的,高效的,带有顺式离子标记的催化剂(8a)的合成,该催化剂在咪唑鎓标签和脯氨酸环之间具有酰胺键。这种新型的台稳催化剂已经在“有水存在”的情况下,在酮和醛之间的经典不对称醛醇缩合中进行了测试,并被提议作为类似但更敏感的酯顺式2d的有价值的替代品。催化剂8a在催化剂负载和立体化学控制方面显示出优异的效率。