Preparation of Organoaluminum Reagents from Propargylic Bromides and Aluminum Activated by PbCl2 and Their Regio- and Diastereoselective Addition to Carbonyl Derivatives

[摘要]：Various propargylic and allenic aluminum reagents have been easily prepared by a direct insert loll of aluminum into propargylic bromides in the presence of PbCl2 (1 mol%). These organoaluminum reagents react with carbonyl compounds to afford the col responding allenic alcohols or homopropargylic alcohols in good to excellent yields with high regio- and diastereoselectivity.

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