Catalytic Asymmetric Epoxidation of α-Methyl α,β-Unsaturated Anilides as Ester Surrogates
作者:Shigeki Matsunaga、Masakatsu Shibasaki、Zhihua Chen、Hiroyuki Morimoto
DOI:10.1055/s-2006-956491
日期:2006.12
Catalytic asymmetric epoxidation of α-methyl α,β-unsaturated carboxylic acid derivatives was achieved using anilide as a template. The Pr(Oi-Pr)3-6,6′-Ph-BINOL complex (10 mol%) with a Ph3P(O) (30 mol%) additive promoted the epoxidation of anilides in up to 99% yield and 88% ee. For α-methyl-β-Ph α,β-unsaturated anilide, the Gd(Oi-Pr)3-6,6′-I-BINOL complex (10 mol%) with Ar3P(O) (30 mol%, Ar = 4-methoxyphenyl)
以苯胺为模板实现了α-甲基α,β-不饱和羧酸衍生物的催化不对称环氧化反应。Pr(Oi-Pr)3-6,6'-Ph-BINOL 配合物 (10 mol%) 与 Ph3P(O) (30 mol%) 添加剂促进苯胺的环氧化,产率高达 99%,ee 高达 88% . 对于 α-甲基-β-Ph α,β-不饱和苯胺,Gd(Oi-Pr)3-6,6'-I-BINOL 配合物 (10 mol%) 与 Ar3P(O) (30 mol%, Ar = 4-甲氧基苯基)是合适的,以87%的产率和78%的ee得到环氧化物。