The Cyclohexa‐2,5‐dienyl Group as a Placeholder for Hydrogen: Organocatalytic Michael Addition of an Acetaldehyde Surrogate
作者:Weiqiang Chen、Huaquan Fang、Kaixue Xie、Martin Oestreich
DOI:10.1002/chem.202003764
日期:2020.11.26
An aldehyde with a cyclohexa‐2,5‐dienyl group in the α‐position is introduced as a storable surrogate of highly reactive acetaldehyde. The cyclohexa‐2,5‐dienyl unit is compatible with an enantioselective Michael addition to nitroalkenes promoted by a Hayashi–Jørgensen catalyst and can be removed by a boron Lewis acid mediated C−C bond cleavage. The robust two‐step sequence does not require a large
引入了在α-位带有环己-2,5-二烯基的醛作为高反应性乙醛的可存储替代物。环己-2,5-二烯基单元与由Hayashi-Jørgensen催化剂促进的硝基烯烃的对映选择性Michael加成相容,并可通过硼路易斯酸介导的C-C键裂解除去。稳健的两步法不需要直接使用乙醛时通常需要的大量醛组分。