Activated primary, secondary, and tertiary amides were coupled with enolizable esters in the presence of LiHMDS to obtain good yields of β-ketoesters at room temperature. Notably, this protocol provides an efficient, mild, and high chemoselectivity method to synthesis of β-alkylketoesters using the cross-coupling between aliphatic amides and esters. Meanwhile, gram-scale secondary and primary amides reacted
在Li
HMDS的存在下,将活化的伯,仲和叔酰胺与可烯醇化的酯偶联,在室温下获得良好的β-
酮酸酯收率。值得注意的是,该方案为脂肪族酰胺和酯之间的交叉偶联提供了一种高效,温和,高
化学选择性的方法来合成β-烷基
酮酸酯。同时,克级仲酰胺和伯酰胺经由原位生成的活化叔酰胺反应,并与酯偶联时表现出良好的反应性。