Brønsted acid catalyzed enantio- and diastereoselective one-pot three component Mannich reaction
摘要:
A chiral derivative of 1,2-benzenedisulfonimide,(-)-4,5-dimethy1-3,6-bis(o-toly1)-1,2-benzenedisulfonimide is herein proven to be an efficient chiral catalyst in a one pot three-component Mannich protocol. Reaction conditions are mild and green, while the enantio- and diastereoselectivity are excellent. (C) 2015 Elsevier Ltd. All rights reserved.
Diastereoselective Mannich reaction with prolinated MWCNTs as a heterogeneous organo-nanocatalyst
作者:Mahsa Khoshnevis、Hossein Eshghi
DOI:10.1007/s12039-020-1740-4
日期:2020.12
Mannich reaction. The results hold out improvements in stereoselectivity, ease of separating and reusability. Graphic Abstract This work represents an efficient and simple method to prepare Prolinated- MWCNTs as a heterogeneous organo-nanocatalyst. Prolinated-MWCNT was characterized by different analyses. The efficiency and catalytic activity of Pro-MWCNTs have investigated in mannich reaction, which
A double axially chiral bisphosphorylimide has been demonstrated to be an efficient and highly sterically hindered Bronsted acid in asymmetric three-component Mannich reactions. Optically active syn-beta-amino ketones were obtained in high yields (up to 99%) with excellent diastereoselectivity (99:1) and enantioselectivity (up to 99% ee). A gram-scale reaction was also performed to prove the synthetic application value of this reaction. (c) 2012 Elsevier Ltd. All rights reserved.
Enzyme-catalyzed asymmetric Mannich reaction using acylase from Aspergillus melleus
作者:Zhi Guan、Jian Song、Yang Xue、Da-Cheng Yang、Yan-Hong He
DOI:10.1016/j.molcatb.2014.11.007
日期:2015.1
Acylase I from Aspergillus melleus (AMA) displayed catalytic promiscuity towards one-pot asymmetric Mannich reaction in acetonitrile for the first time. AMA showed favourable catalytic activity with good adaptability to different substrates. The activity and stereoselectivity of the enzyme could be improved by adjusting solvent, pH, water content, temperature, molar ratio of substrates and enzyme loading. The enantioselectivities up to 89% ee, diastereoselectivities up to 90:10 dr (syn/anti) and yields up to 82% were achieved. This work offered a novel case of enzyme catalytic promiscuity and a potential synthetic method for organic chemistry. (C) 2014 Elsevier B.V. All rights reserved.
Brønsted acid catalyzed enantio- and diastereoselective one-pot three component Mannich reaction
A chiral derivative of 1,2-benzenedisulfonimide,(-)-4,5-dimethy1-3,6-bis(o-toly1)-1,2-benzenedisulfonimide is herein proven to be an efficient chiral catalyst in a one pot three-component Mannich protocol. Reaction conditions are mild and green, while the enantio- and diastereoselectivity are excellent. (C) 2015 Elsevier Ltd. All rights reserved.