Bimetallic Catalytic Asymmetric Tandem Reaction of β‐Alkynyl Ketones to Synthesize 6,6‐Spiroketals
作者:Shulin Ge、Weidi Cao、Tengfei Kang、Bowen Hu、Hang Zhang、Zhishan Su、Xiaohua Liu、Xiaoming Feng
DOI:10.1002/anie.201812842
日期:2019.3.18
The enantioselective tandem reaction of β,γ‐unsaturated α‐ketoesters with β‐alkynyl ketones was realized by a bimetallic catalytic system of achiral AuΙΙΙ salt and chiral N,N′‐dioxide‐MgΙΙ complex. The cycloisomerization of β‐alkynyl ketone and asymmetric intermolecular [4+2] cycloaddition with β,γ‐unsaturated α‐ketoesters subsequently occurred, providing an efficient and straightforward access to
β的对映选择性串联反应,具有β -炔基酮γ不饱和α酮酯是由非手性Au的双金属催化剂体系实现ΙΙΙ盐和手性Ñ,Ñ '二氧化物-镁ΙΙ复杂。随后发生了β-炔基酮的环异构化和不对称分子间[4 + 2]与β,γ-不饱和α-酮酸酯的加成反应,可高效,直接地获得手性多功能6,6-螺缩酮,产率高达97%,94 %ee和> 19/1 dr此外,基于控制实验的结果,提出了一个催化循环。