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The development of a flow chemistry process for asymmetric propargylation using allene gas as a reagent is reported. The connected continuous process of allene dissolution, lithiation, Li‐Zn transmetallation, and asymmetric propargylation provides homopropargyl β‐amino alcohol 1 with high regio‐ and diastereoselectivity in high yield. This flow process enables practical use of an unstable allenyllithium...
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