Synthesis of β-Amino Esters via Aza-Michael Addition of Amines to Alkenes Promoted on Silica: A Useful and Recyclable Surface
作者:Basudeb Basu、Pralay Das、Ismail Hossain
DOI:10.1055/s-2004-834836
日期:——
A solvent-free protocol for the synthesis of β-amino esters and nitriles has been developed via conjugate addition of amines to electron-deficient alkenes promoted on silica. The silica surface may be recycled. Both aliphatic and aromatic primary or secondary amines worked efficiently to yield the desired adducts in good to excellent yields.
Chemoselective Michael TypeAddition of Aliphatic Amines to α,β-Ethylenic CompoundsUsing Bismuth Triflate Catalyst
作者:Srinivas R. Adapa、Ravi Varala、M. Mujahid Alam
DOI:10.1055/s-2003-38345
日期:——
Catalytic amounts of bismuth triflate efficiently catalyse the conjugate addition of aliphatic amines to α,β-ethylenic compounds in acetonitrile under mild conditions. The reaction is chemoselective, as aromatic amines do not participate in the reaction. Further, the catalyst can be easily recovered and reused.