Enantioselective organocatalytic approach to δ-lactones bearing a fused cyclohexanone scaffold
作者:Dorota Kowalczyk、Łukasz Albrecht
DOI:10.1016/j.tetlet.2018.05.053
日期:2018.7
A new method based on the cascade reaction between β,γ-unsaturated-α-ketophosphonates and cyclic 1,3-dicarbonyls is reported for the synthesis of highly enantiomerically enriched δ-lactones bearing a fused cyclohexenone scaffold. The target products bearing a δ-lactone moiety and one stereogenic center were obtained in good to excellent yields (83–96%) and enantioselectivities (63:32–95:5 er). The
报道了一种基于β,γ-不饱和-α-酮膦酸酯和环状1,3-二羰基酯之间的级联反应的新方法,用于合成高度对映体富集的带有稠合环己烯酮骨架的δ-内酯。获得具有δ-内酯部分和一个立体异构中心的目标产物,收率良好至优异(83-96%)和对映选择性(63:32-95:5 er)。在衍生自金鸡纳生物碱奎宁并经方酰胺部分改性的手性布朗斯台德碱催化剂的存在下,可获得最佳结果。