Enantioselective Mukaiyama–Michael Reaction of β,γ-Unsaturated α-Keto Esters with Silyl Ketene Acetals Catalyzed by a Chiral Magnesium Phosphate
作者:Hualing He、Xizhe Shen、Xinying Ding、Jon C. Antilla
DOI:10.1021/acs.orglett.2c04277
日期:2023.2.10
We would like to describe an efficient and highly enantioselective Mukaiyama–Michael reaction of silyl ketene acetals with β,γ-unsaturated α-keto esters catalyzed by a chiral magnesium BINOL-derived phosphate. The resulting functionalized 1,5-dicarbonyl adducts are obtained in high yields (up to 96%) and with excellent enantioselectivities (up to 98%) under mild conditions. Two plausible mechanistic
我们想描述一种高效且高度对映选择性的 Mukaiyama-Michael 反应,甲硅烷基乙烯酮缩醛与 β,γ-不饱和 α-酮酯,由手性镁 BINOL 衍生的磷酸盐催化。由此产生的功能化 1,5-二羰基加合物在温和条件下以高收率(高达 96%)和出色的对映选择性(高达 98%)获得。提出了两个似是而非的机制途径,包括 1,4-加成和杂 Diels-Alder [4 + 2] 环加成。