Directed Ruthenium‐Catalyzed C(
<i>sp</i>
<sup>3</sup>
)H α‐Alkylation of Cyclic Amines Using Dioxolane‐Protected Alkenones
作者:Artem A. Kulago、Ben F. Van Steijvoort、Emily A. Mitchell、Lieven Meerpoel、Bert U. W. Maes
DOI:10.1002/adsc.201400117
日期:2014.5.5
catalytic system for ruthenium‐catalyzed C(sp3)H α‐alkylation of piperidines with dioxolane‐protected alkenones is reported. Dioxolane protection of the ketone proved crucial to obtain alkylation products. A diverse set of highly substituted piperidines was readily prepared in moderate to good yields via this methodology from easily accessible starting materials (C‐2, C‐3 and C‐4 substituted piperidines)
对于钌催化C(A催化体系的SP 3)报道H带二氧戊环保护的哌啶烯酮α-烷基化。事实证明,酮的二氧戊环保护对获得烷基化产物至关重要。一组不同的高度取代的哌啶的混合物容易地在温和的制备良好的产率通过从易于获取的起始原料(C-2,C-3和C-4取代的哌啶)中获得这种方法。当该方法应用于具有两个α位的C-3取代的哌啶时,仅观察到单烷基化产物(2,5-二取代)。甚至可以使用具有稠合哌啶部分的双环胺。还证明了成功的引导基团以及保护基团(缩酮)的去除。因此,该方法允许人们进一步衍生和获得迄今未知的官能化环胺衍生物,并将在分子库合成中有用。