designable cations and anions. Anions have two types of acids, acidic protons, and metals with Lewis acidity. In order to test the efficientcatalytic behavior of the tetradentate catalyst, a controlled reaction was performed using benzaldehyde, aniline and cyclohexanone. Imine from the condensation of benzaldehyde and aniline was observed in the absence of ionic catalyst instead of desired products. Thus
使用季戊四醇四甲基咪唑鎓磷钨酸盐 (C(MIM-PTA) 4 ) 作为新的四齿酸性催化剂,已经完成了一系列已知的 β-氨基环己酮的合成。由季戊四醇四溴化物与甲基咪唑缩合而成。然后,用Br -取代大体积阴离子H 2 PW 12 O 40 1-在结构中。这种四齿催化剂提供可设计的阳离子和阴离子。阴离子有两种类型的酸,酸性质子和具有路易斯酸性的金属。为了测试四齿催化剂的有效催化行为,使用苯甲醛、苯胺和环己酮进行受控反应。在不存在离子催化剂而不是所需产物的情况下观察到来自苯甲醛和苯胺缩合的亚胺。因此,由于不存在中间体的分离和立体专一性,该反应由于时间、能量和节省原材料的考虑将是有吸引力的。该催化剂显示出高催化活性,使得经过四次循环后,得到高收率和高纯度的产物。该反应在室温下进行。虽然高温可以提高反应速率,但它有助于醛和胺的副反应和氧化。催化剂通过元素分析、FT-IR光谱、1 H NMR、 13 C
Direct Asymmetric Mannich Reaction Catalyzed by a d-Glucosamine-Derived Organocatalyst
作者:Rama Peddinti、Arun Sharma
DOI:10.1055/s-0036-1591740
日期:2018.3
Sugar-based primary amines have been employed as organocatalysts for the direct asymmetric Mannich reaction. By catalyst-screening experiments, we observed that catalysts bearing a hydroxy function at C-3 actively participated in the reaction, possibly through hydrogen bonding with the imine generated in situ, to provide β-amino carbonyl compounds with better diastereoselectivity and enantioselectivity
2-Pyrrolidinecarboxylic Acid Ionic Liquid as a Highly Efficient Organocatalyst for the Asymmetric One-Pot Mannich Reaction
作者:Xin Zheng、Yun-Bo Qian、Yongmei Wang
DOI:10.1002/ejoc.200901088
日期:2010.1
A novel one-pot three-component asymmetricMannichreaction using [EMIm][Pro] (1) as a catalyst has been developed. By employing this new reaction system, a variety of optically active β-amino carbonyl compounds were synthesized in up to 99 % yield with up to >99 dr and >99 % ee. The reaction conditions have been optimized and the mechanism for the asymmetric induction is discussed.
IsosteviolProline Conjugates as Highly Efficient Amphiphilic Organocatalysts for Asymmetric Three-Component Mannich Reactions in the Presence of Water
作者:Ya-Jie An、Chuan-Chuan Wang、Zi-Ping Liu、Jing-Chao Tao
DOI:10.1002/hlca.201100265
日期:2012.1
work, six isosteviolamino acid conjugates were designed and synthesized through simple condensation on a large scale without protecting group (Scheme). These amphiphilicorganocatalysts mediated asymmetric three‐component Mannichreactions of cyclohexanone and anilines with aromatic aldehydes in the presence of H2O. Meanwhile, the isosteviolprolineconjugate 3b has been established as a highly efficient
Direct asymmetric three-componentMannichreaction involving simple ketones (such as cyclohexanone, acetone, and acetophenone) as donors and catalyzing by silver tartaric acid-derived phosphate was realized to afford a series of optically active β-amino-ketone derivatives in high yields (up to 96%) and good-to-high enantioselectivities (up to 97%) with moderate-to-good diastereoselectivities. This