科研之友
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摘要
An additive-free Pd-catalyzed alpha-allylation of different imino-group-ontaining heterocycles is reported. The activation of alpha-CH pronucleophiles (pK(a) (DMSO) > 25) occurs without the addition of strong bases or Lewis acids using only the Pd/Xantphos catalyst system. The reaction scope has been studied for various 5- and 6-membered nitrogen-containing heterocycles (yields up to 96%). Mechanistic investigations suggest an initial allylation of the imine-N followed by a Pd-catalyzed formal aza-Claisen rearrangement.
- 出版日期2017-1-6
