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.
A Novel Polyaniline-Silver Nitrate-p-Toluenesulfonic Acid Salt as Recyclable Catalyst in the Stereoselective Synthesis of β-Amino Ketones: “One-Pot” Synthesis in Water Medium
作者:Srinivasan Palaniappan、Boddula Rajender
DOI:10.1002/adsc.201000346
日期:2010.10.4
addresses the shortage of synthetic methods for 100% anti-β-amino ketones using a recyclable catalyst. The reaction scope was also extended with aromatic aldehydes and aromatic amines. The developed process conforms to the principles of ‘green’ chemistry by the usage of water as medium, and the easilyhandlable and recyclable nature of the catalyst.
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