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A simple one‐pot synthesis of β‐hydroxyallenamides is reported. This procedure entails chemo‐ and regioselective hydroboration of 3‐en‐1‐ynyl‐sulfonylamides with Cy2BH followed by homoallenylation of aldehydes to yield β‐hydroxyallenamides (up to 94% yield and >20:1 dr). Controlled synthesis of up to three continuous stereochemical elements was realized. Density functional theory (DFT) calculations...
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