With the aim of improving catalytic performance and recyclability various ionic-liquid-tagged organocatalysts (ILTOCs) based on (S)-proline as organocatalysts and triazolium or guanidinium salts as ionic liquid tags were applied in the asymmetric α-aminoxylation of ketones and aldehydes with nitrosobenzene in IL as solvents. Amongst such ILTOC’s compounds were found which performed better (ee >99%
为了提高催化性能和可回收性,基于(S)-脯
氨酸的各种
离子液体标记有机催化剂(ILTOC)被用作有机催化剂,三唑鎓盐或
胍盐作为
离子液体标签被用于酮和醛的不对称α-
氨基
木糖化反应。 IL中的
亚硝基苯为溶剂。在这些ILTOC的化合物中,发现其性能(ee> 99%,收率97%)比(S脯
氨酸在报告的病例中。ILTOC的回收和再利用很容易实现,直到第五个周期,产量都高于80%,ee高于90%。已发现有关
水在通过烯胺活化与羰基化合物反应过程中脯
氨酸衍生的有机催化剂循环利用中的关键作用的重要信息,可以防止
恶唑烷酮的形成对有机催化剂的阻断。