Synthesis and structure of the bimetallic organoantimony catalyst and its application in diastereoselective direct Mannich reaction as facile separation catalytic system
A bimetallic organoantimony catalyst with four Lewis/Brønsted acidic/basic sites assembled orderly was successfully synthesized and showed high catalytic efficiency. It has been applied in diastereoselective direct Mannich reaction by adding 0.1 mol% catalyst. This reaction presented unexpected facile separation ability from homogenous solution to heterogeneous solution.
ZSM-5-$SO_3H$ efficiently catalyzed the one-pot three-component Mannich reaction of aldehydes, anilines, and ketones. $\beta}$-Aminocarbonyl compounds were obtained in reasonable yields and excellent stereoselectivities when the reaction was carried out at room temperature under solvent-free conditions. Simple experimental conditions and product isolation procedure makes this protocol potential for the development of clean and environment-friendly strategy for the synthesis of $\beta}$-amino-ketones. The catalyst was recovered and reused for subsequent runs.
Direct Mannich reaction mediated by Fe(Cp)2PF6 under solvent-free conditions
作者:Rukhsana I. Kureshy、Santosh Agrawal、S. Saravanan、Noor-ul H. Khan、Arpan K. Shah、Sayed H.R. Abdi、Hari C. Bajaj、E. Suresh
DOI:10.1016/j.tetlet.2009.11.022
日期:2010.1
Fe(Cp)(2)PF6 (5 mol %) efficiently catalyzed Mannich reaction of aldehydes, anilines, and ketones under solvent-free condition to give beta-amino-ketones in high yield (up to 94%) within 30 min with anti-isomer in excess. Simple experimental conditions and product isolation procedure makes this protocol potential for the development of clean and environment-friendly strategy for the synthesis of beta-amino-ketones. (C) 2009 Elsevier Ltd. All rights reserved.
Mannich-Type Reaction Using Alkenyl Trichloroacetates Catalyzed by Dibutyltin Dimethoxide
A novel Mannich-typereaction of alkenyltrichloroacetates with aldimines has been realized by usingdibutyltindimethoxide as a catalyst, which is regenerated by addition of methanol. A three-component coupling reaction of aldehydes, primary amines, and alkenyltrichloroacetates has been also efficiently achieved. These procedures can provide a variety of β-amino ketones not only from aromatic aldehydes