Effective and recyclable dendritic catalysts for the direct asymmetric Michael addition of aldehydes to nitrostyrenes
作者:Yawen Li、Xin-Yuan Liu、Gang Zhao
DOI:10.1016/j.tetasy.2006.07.004
日期:2006.8
Direct catalytic enantio- and diastereoselective Michael addition reaction of aldehydes to nitrostyrenes is described using a series of recyclable chiral 2-trimethylsilanyloxy-methyl-pyrrolidine-based dendritic catalysts. Good yields (up to 82%), and high diastereoselectivities (up to syn/anti = 95/5) and enantioselectivities (up to 99% ee) have been obtained.
使用一系列可循环使用的手性2-三甲基甲硅烷基氧基-甲基-吡咯烷基树枝状催化剂描述了醛与硝基苯乙烯的直接催化对映和非对映选择性迈克尔加成反应。获得了良好的收率(高达82%),高的非对映选择性(高达syn / anti = 95/5)和对映选择性(高达99%ee)。
4,4′-Disubstituted-L-proline Catalyzes the Direct Asymmetric Michael Addition of Aldehydes to Nitrostyrenes
作者:Liu-qun Gu、Gang Zhao
DOI:10.1002/adsc.200600640
日期:2007.7.2
In a search for small organic molecules as catalysts for the directasymmetricMichaeladdition reaction of aldehydes to nitrostyrenes, 4,4′-di(naphthalene-1-ylmethyl)-L-proline 1c and a catalytic amount of 4-dimethylaminopyridine (DMAP) were found to be an efficient system for the Michaeladdition of aldehydes to nitrostyrenes with high diastereo- and enantioselectivity and broad substrate range.
[EN] POLYMER SUPPORTED FLUORINATED ORGANOCATALYST<br/>[FR] ORGANOCATALYSEUR FLUORÉ SUR SUPPORT POLYMÈRE
申请人:FUNDACIÓ INST CATALÀ D'INVESTIGACIÓ QUÍMICA
公开号:WO2017008832A1
公开(公告)日:2017-01-19
Polymer supported fluorinated compound of formula I, wherein the meaning for each R1 is as disclosed in the description. These compounds are useful as catalysts, particularly in Michael addition reactions under continuous flow.
Synthesis of a bipyridine-derived achiral thiourea trifluoromethanesulfonic acid salt and its application as an additive in organocatalytic asymmetric reactions
作者:Ayhan Sıtkı Demir、Sinan Basceken
DOI:10.1016/j.tetlet.2013.08.004
日期:2013.10
The host–guest complex of a proline–thiourea bipyridine trifluoromethanesulfonic acidsalt can catalyze organocatalytic asymmetricreactions such as aldol, Michael, and Mannich in polar protic medium with high stereoselectivities. The privileged bipyridine backbone and the thiourea motif are essential to the activity and enantioselectivity through hydrogen bonding interactions.
Enantio- and Diastereoselective Michael Addition of Cyclic Ketones/Aldehydes to Nitroolefins in Water as Catalyzed by Proline-Derived Bifunctional Organocatalysts
作者:Daeil Bae、Jin Won Lee、Do Hyun Ryu
DOI:10.1021/acs.joc.2c02218
日期:2022.12.16
New l-proline-derived bifunctional secondary amine organocatalysts were synthesized for enantioselective Michael reactions in water as a solvent. Application of these catalysts in Michaeladditions provided high yield (up to 97%) with high stereoselectivity (dr up to 99:1 and ee up to 99%). The effect of phenyl group at (R)-C6 in the catalyst was investigated and played a key role in successful catalysis
合成了新的l-脯氨酸衍生的双功能仲胺有机催化剂,用于在水中作为溶剂进行对映选择性迈克尔反应。这些催化剂在迈克尔加成中的应用提供了高收率(高达 97%)和高立体选择性(dr 高达 99:1 和 ee 高达 99%)。通过密度泛函理论计算,研究了催化剂中( R )-C 6处苯基的作用,发现其对催化成功起着关键作用。该反应的合成效用已通过 Sch 50971 的正式合成得到证实,Sch 50971 是一种新型组胺 H 3受体激动剂。