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 ethyl N-[(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%.
在不添加碱的情况下,通过用N -[(4-硝基苯磺酰基)氧基]氨基甲酸乙酯(NsONHCO 2 Et)胺化β-烯胺酯,可以得到N取代的α-氨基β-氧代酯。具有C 2对称性的旋光活性吡咯烷类用作手性助剂的非对映选择性高达80%。