Oxidative Pictet-Spengler cyclisations through acceptorless iridium-catalysed dehydrogenation of tertiary amines
作者:John P. Cooksey、Ourida Saidi、Jonathan M.J. Williams、A. John Blacker、Stephen P. Marsden
DOI:10.1016/j.tet.2020.131785
日期:2021.1
The valuable tetrahydro-β- and γ-carboline skeleta can be accessed through Pictet-Spengler cyclisation initiated by acceptorless dehydrogenation of saturated cyclic amines. The substrate scope for the β-isomers is found to be somewhat limited, but access to the γ-isomers through the more reactive 2-(aminoethyl)indoles is more general. The synthetic utility of hydrogen transfer catalysis is highlighted
有价值的四氢-β-和γ-咔啉骨架可以通过Pictet-Spengler环化反应获得,该环化反应由饱和环胺的无受体脱氢反应引发。发现β-异构体的底物范围受到一定限制,但是通过反应性更强的2-(氨乙基)吲哚接近γ-异构体的途径更为普遍。通过顺序的氧化还原-中性烷基化/脱氢环化反应,生物碱去溴阿糖胞苷A的两步制备突出了氢转移催化的合成效用。