<i>O</i>-TMS-α,α-diphenyl-(<i>S</i>)-prolinol Modified with an Ionic Liquid Moiety: A Recoverable Organocatalyst for the Asymmetric Michael Reaction between α,β-Enals and Dialkyl Malonates
作者:Oleg V. Maltsev、Alexandr S. Kucherenko、Sergei G. Zlotin
DOI:10.1002/ejoc.200900807
日期:2009.10
O-TMS-α,α-diphenyl-(S)-prolinol derivative bearing an ionic liquid fragment was synthesized for the first time and proven to be an efficient catalyst for the asymmetric Michael reaction of aromatic α,β-unsaturated aldehydes with dialkyl malonates. The prepared catalyst can be recovered four times and used in the same reaction without a decrease in activity or a decrease in the enantioselectivity of
首次合成了带有离子液体片段的 O-TMS-α,α-二苯基-(S)-脯氨醇衍生物,并证明它是芳香族 α,β-不饱和醛与丙二酸二烷基酯不对称迈克尔反应的有效催化剂. 制备的催化剂可以回收四次并用于相同的反应,而不会降低反应的活性或对映选择性。 (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)