A rhodium‐catalyzed chemo‐, regio‐, and enantioselective addition of 2‐pyridones to terminal allenes to give branched N‐allyl 2‐pyridones is reported. Preliminary mechanistic studies support the hypothesis that the reaction was initiated from the more acidic 2‐hydroxypyridine form, and the initial kinetic O‐allylation product was finally converted into the thermodynamically more stable N‐allyl 2‐pyridones.
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Li et al. (2014) studied this question.
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