Highly efficient one-pot, three-component Mannich reaction catalysed by boric acid and glycerol in water with major ‘syn’ diastereoselectivity
作者:Chhanda Mukhopadhyay、Arup Datta、Ray J. Butcher
DOI:10.1016/j.tetlet.2009.04.135
日期:2009.7
Boric acid and glycerol efficiently catalysed the one-pot, three-componentMannichreaction of aldehydes, aromatic amines and cyclic ketones in water at ambient temperature to afford the corresponding β-amino carbonyl compounds in good yields. All but one reaction proceeded with moderate ‘syn’ diastereoselectivity. This observation is just the reverse of the major anti diastereoselectivity obtained
Vanillic Mannich bases: synthesis and screening of biological activity. Mechanistic insight into the reaction with 4-chloroaniline
作者:Vladimir P. Petrović、Dušica Simijonović、Marko N. Živanović、Jelena V. Košarić、Zorica D. Petrović、Svetlana Marković、Snežana D. Marković
DOI:10.1039/c4ra03909b
日期:——
One-step multi-component Mannichreaction of vanillin, aromatic amines (aniline and 4-chloroaniline), and cyclohexanone was successfully catalyzed by three chloroacetate ethanolamine based ionic liquids: diethanolammonium chloroacetate, and newly synthesized ethanolammoniumchloroacetate and N,N-diethylethanolammoniumchloroacetate. These reactions were performed in ethanol at room temperature. Mechanistic
afforded corresponding Mannich adducts. In the case of cyclohexanone, stereoselectivity was changed depending on the nature of the substitution on benzaldehydes, in which, moderate electron-donating and electron-withdrawing groups afforded the anti isomer as major products, but strongly electron-donating substituted benzaldehydes led to syn isomer as the major Mannich adducts. Mannich reaction with cycloheptanone