Diastereo- and enantioselective aldol reaction of granatanone (pseudopelletierine)
作者:Ryszard Lazny、Karol Wolosewicz、Paulina Zielinska、Zofia Urbanczyk-Lipkowska、Przemyslaw Kalicki
DOI:10.1016/j.tet.2011.09.096
日期:2011.12
can be enantioselectively lithiated by chiral lithium amides and the resulting non-racemic enolate can be reacted with aldehydes giving aldols with enantiomeric excess up to 93% (99% ee after recrystallization). The absolute and relative configuration of the aldol products was determined by NMR spectroscopy and X-ray analysis. Granatanone; aldol reaction; asymmetric synthesis; enantioselective deprotonation;
Granatanone(granatan-3-one,9-methyl-9-azabicyclo [3.3.1] nonan-3-one,pseudopelletierine或pseudopelletrierin)与酰胺化锂进行质子化反应,得到烯醇锂,后者与醛非对映地选择性地反应生成异硫异构体和反/顺选择性高达98:2。可以通过手性锂酰胺将对萘烷酮进行对映选择性地锂化,并且可以使所得的非外消旋烯醇化物与醛反应,得到对映体过量高达93%的醛醇(重结晶后,ee为99%)。醛醇产物的绝对和相对构型通过NMR光谱和X射线分析确定。 格拉那坦酮; 羟醛反应; 不对称合成 对映选择性去质子; 手性锂酰胺。