Highly Enantioselective Catalytic Asymmetric [2+2] Cycloadditions of Cyclic α-Alkylidene β-Oxo Imides with Ynamides
作者:Kazuaki Enomoto、Harufumi Oyama、Masahisa Nakada
DOI:10.1002/chem.201406189
日期:2015.2.9
Highly enantioselective catalytic asymmetric [2+2] cycloadditions of cyclic α‐alkylidene β‐oxo imides with ynamides are described. The high reactivity of the cyclic α‐alkylidene β‐oxo imide allows the [2+2] cycloadditions of a hindered substrate with unreactive ynamides at low temperature. The X‐ray crystallographic analysis of the product suggests that the enantioselectivity of the [2+2] cycloaddition