The N,N‘-dioxide−Cu(I) complexes have been developed to catalyze the addition of nitromethane to N-tosyl aldimines. The aza-Henryreaction proceeds smoothly affording the corresponding nitro amines in good yields with high enantioselectivities. A catalytic cycle is proposed to explain the origin of reactivity.
The effect of coordination on the reaction of N-tosyl imines with diethylzinc
作者:Feifeng Gao、Minzhi Deng、Changtao Qian
DOI:10.1016/j.tet.2005.09.111
日期:2005.12
The effect of coordination on the reaction of N-tosyl imines and diethylzinc was studied in detail. It showed that there was strong coordination between N-tosyl imine and diethylzinc. Due to this coordination, N-tosyl imines could be reduced directly through the β-H transferring mechanism by diethylzinc in nonpolar solvents to afford the corresponding secondary amines in excellent yields at mild conditions
The addition reaction of nitro compounds to azomethine functions, known as the aza-Henry (or nitro-Mannich) reaction was performed electrochemically under solvent and supporting electrolyte-free conditions. Reaction yields are very good and the method is very clean, avoiding the use of any classical solvent or catalyst.
Synthesis of <font>β</font>-Nitroamines Using Nanocrystalline MgO
作者:L. Chakrapani、M. Lakshmi Kantam
DOI:10.1080/00397911003707147
日期:2011.12.1
Nanocrystalline magnesium oxide (NAP-MgO) was found to be an effective heterogeneous, solid base catalyst for the direct aza-Henry reaction of nitroalkanes and various N-arylidene-4-methylbenzenesulfonamides to afford the corresponding beta-nitroamines in excellent yields under mild conditions. The catalyst was recovered by simple centrifugation and reused for three cycles with consistent activity.