Chelated enolates undergo Michael addition towards halogenated α,β-unsaturated esters in a highly stereoselective fashion. The enolates formed can be trapped with aldehydes in a stereoselective aldol reaction, before subsequent cyclization gives rise to substituted furanoid amino acids. Up to for stereogenic centers can be formed in this new one-pot reaction.
螯合烯醇盐以高度立体选择性的方式与卤化δ±,δ²-不饱和酯发生迈克尔加成反应。形成的烯醇可以与醛发生立体选择性醛醇反应,然后再进行环化反应,生成取代的
呋喃氨基酸。在这种新的一锅反应中,最多可形成立体中心。