作者:Stefania Fioravanti、Alberto Morreale、Lucio Pellacani、Paolo A Tardella
DOI:10.1016/s0040-4039(00)02200-0
日期:2001.2
The reaction of NsONHCO(2)Et, in the presence of CaO, with beta -oxo esters gives the corresponding aminated products in yields up to 58%. A substrate carrying the Oppolzer sultam undergoes amination with 40% diastereoselectivity. (C) 2001 Elsevier Science Ltd. All rights reserved.
Easy access to α-amino β-oxo esters from β-enamino esters
作者:Elena Felice、Stefania Fioravanti、Lucio Pellacani、Paolo A. Tardella
DOI:10.1016/s0040-4039(99)00760-1
日期:1999.6
N-Substituted α-amino β-oxo esters have been obtained by amination of β-enamino esters with ethylN-[(4-nitrobenzenesulphonyl)oxy]carbamate (NsONHCO2Et), in the absence of added bases. The use of optically active pyrrolidines with C2 symmetry as chiral auxiliaries induces diastereoselectivities up to 80%.