Enantioselective Organocatalysis in Ionic Liquids: Addition of Aliphatic Aldehydes and Ketones to Diethyl Azodicarboxylate
作者:Peter Kotrusz、Sara Alemayehu、Štefan Toma、Hans-Günther Schmalz、Andreas Adler
DOI:10.1002/ejoc.200500481
日期:2005.11
The enantioselective addition of aldehydes to diethyl azodicarboxylate in ionic liquids in the presence of chiralorganocatalysts has been investigated. Of seven differentorganocatalysts tested, L-proline and L-thiazoline-2-carboxylic acid gave the highest enantioselectivities (up to 94 % ee). The best results were obtained by using [bmim]PF6 and [hmim]BF4 as ionic liquids. The scope of the methodology
已经研究了在手性有机催化剂存在下,醛与偶氮二羧酸二乙酯在离子液体中的对映选择性加成。在测试的七种不同有机催化剂中,L-脯氨酸和 L-噻唑啉-2-羧酸的对映选择性最高(高达 94% ee)。通过使用[bmim]PF6 和[hmim]BF4 作为离子液体获得了最好的结果。该方法的范围是通过使用各种醛和酮来探索的。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)