Efficient Synthesis of Optically Active 2,3-Allenols via the Simple CuBr-Mediated Reaction of Optically Active Propargylic Alcohols with Paraformaldehyde

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Abstract
Enantiomerically enriched 2,3-allenols were prepared by the CuBr-mediated homologation of the relatively easily available optically active terminal propargylic alcohols with paraformaldehyde in the presence of diisopropylamine.