酮和醛之间的对映选择性醛醇缩合反应构成了评价新型有机催化剂的最常见反应模型之一。最近几年,已经表明有机催化醛醇缩合反应可以在水中进行。由脯氨酸,苯丙氨酸和氨基酸的叔丁基酯组成的三肽家族已成功用于这种不对称转化中。以高收率(高达99%)和出色的非对映异构体(高达97:3 dr)和对映选择性(高达99%ee)获得了各种酮与醛之间的反应产物。C末端氨基酸决定三肽(Pro-Phe-AA-O t Bu)在水性或有机介质中有效发挥作用的能力。
The application of a structurally simple, recyclable, and large-scale l-prolinamide catalyst for asymmetric aldol reactions
作者:Zhi Guan、Yuan Luo、Bao-Qiang Zhang、Krystal Heinen、Da-Cheng Yang、Yan-Hong He
DOI:10.1016/j.tetasy.2014.04.009
日期:2014.5
With heterocyclic ketones or cyclohexanone, the aldolreactions gave products in high yields and with respectable enantioselectivities (87–99% ee) and diastereoselectivities (up to >99:1 anti/syn). The catalyst could be recycled and reused up to seven times resulting in good yields and with good selectivities. This catalyst is also efficient in large-scale reactions with the enantioselectivities remaining
Effect of additives on the proline-catalyzed ketone–aldehyde aldol reactions
作者:Petri M. Pihko、Katri M. Laurikainen、Annina Usano、Annika I. Nyberg、Jatta A. Kaavi
DOI:10.1016/j.tet.2005.09.070
日期:2006.1
The effect of bases, acids, and water as additives in proline-catalyzed ketone–aldehyde aldol reactions has been studied. While the reaction appears to be relatively tolerant to small amounts of tertiary amine bases or weak acids, it stops completely with strong acids. The use of water as an additive had a highly beneficial effect on reactions that were conducted with a stoichiometric ratio of ketone
tert-Butyl esters of tripeptides based on Pro-Phe as organocatalysts for the asymmetric aldol reaction in aqueous or organic medium
作者:Anastasia Psarra、Christoforos G. Kokotos、Panagiota Moutevelis-Minakakis
DOI:10.1016/j.tet.2013.12.007
日期:2014.1
The enantioselectivealdolreaction between ketones and aldehydes constitutes one the most common reaction models for the evaluation of novel organocatalysts. The last few years, it has been shown that the organocatalytic aldolreaction can be performed in water. A family of tripeptides consisting of proline, phenylalanine, and tert-butyl esters of amino acids was successfully employed in this asymmetric
酮和醛之间的对映选择性醛醇缩合反应构成了评价新型有机催化剂的最常见反应模型之一。最近几年,已经表明有机催化醛醇缩合反应可以在水中进行。由脯氨酸,苯丙氨酸和氨基酸的叔丁基酯组成的三肽家族已成功用于这种不对称转化中。以高收率(高达99%)和出色的非对映异构体(高达97:3 dr)和对映选择性(高达99%ee)获得了各种酮与醛之间的反应产物。C末端氨基酸决定三肽(Pro-Phe-AA-O t Bu)在水性或有机介质中有效发挥作用的能力。