A complementing Pd‐ and Rh‐catalyzed dynamic kinetic resolution (DKR) of racemic allenes leading to N ‐allylated pyrazoles is described. Such compounds are of enormous interest in medicinal chemistry as certified drugs and potential drug candidates. The new methods feature high chemo‐, regio‐ and enantioselectivities aside from displaying a broad substrate scope and functional group compatibility. A mechanistic rational accounting for allene racemization and trans ‐alkene selectivity is discussed.
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Hilpert et al. (2018) studied this question.
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