Sc(OTf)3-catalysed allylations of hydrates of α-keto aldehydes and glyoxylates and activated aromatic aldehydes with allyltrimethylsilane in H2O–CH3CN were examined. α-Keto and α-ester homoallylic alcohols 3a–d and aromatic homoallylic alcohols 3e–f were obtained in good to excellent yields, depending on the reaction temperature and the ratio of H2O to CH3CN in co-solvent.
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