Oxoammonium Salt-Promoted Multifunctionalization of Saturated Cyclic Amines Based On β-Oxo Cyclic Iminium Ion Intermediates
作者:Yan He、Qimeng Liu、Jintao Yang、Zhi Zheng、Guo-Li Chai、Xinying Zhang、Xuesen Fan
DOI:10.1021/acs.orglett.2c03253
日期:2022.10.28
C(sp3)–H bond functionalization of saturated cyclic amines through oxoammonium salt-promoted oxidation to afford a β-oxo cyclic iminium ion as a key intermediate, followed by cascade addition with thiocyanate and diverse N-, O-, and S-containing nucleophiles in the green solvent and EtOH. Notably, chiral spiro azapolyheterocycles were prepared enantioselectively (>20:1 dr, up to 99% ee) when cysteine or
在此,我们描述了一种通过氧铵盐促进氧化对饱和环胺进行多 C(sp 3 )–H 键功能化的简便方法,以提供 β-氧环亚胺离子作为关键中间体,然后与硫氰酸盐和多种 N 进行级联加成绿色溶剂和 EtOH 中含有 -、O- 和 S 的亲核试剂。值得注意的是,当使用半胱氨酸或丝氨酸酯作为底物时,可以对映选择性地制备手性螺氮杂多杂环化合物(>20:1 dr,高达 99% ee)。此外,利用该方法还完成了多种天然产物衍生物的简洁后期修饰。