A new copper(II) bromide/N-methylmorpholine N-oxide (NMO)-promoted method for α-amination of esters under continuous-flow conditions, with reduced catalyst loading is reported. The α-amino esters are precursors for the synthesis of α-amino acids. This method provides α-amino esters in 58–83% yields. The desired Cu(II)Br catalyst is regenerated by in situ oxidation of Cu(I)Br in the presence of NMO
报道了一种新的溴化铜( II )/ N-甲基吗啉N-氧化物(NMO)促进的连续流动条件下酯的α-胺化方法,并减少了催化剂负载量。α-氨基酯是合成α-氨基酸的前体。该方法提供 α-氨基酯,产率为 58-83%。所需的 Cu( II )Br 催化剂通过在 NMO 存在下原位氧化 Cu( I )Br来再生。
Copper-Catalyzed Amination of Silyl Ketene Acetals with <i>N</i>-Chloroamines
作者:Tomoya Miura、Masao Morimoto、Masahiro Murakami
DOI:10.1021/ol302331k
日期:2012.10.19
A copper(I)/2,2′-bipyridyl complex catalyzes an amination reaction of silyl ketene acetals with N-chloroamines, presenting a newpreparativemethod of α-amino esters.