The π-allyilanthanoidatecomplex (1), which was prepared in situ from tetra-allyltin, the lanthanoid trichloride, and n-butyl-lithium in tetrahydrofuran (THF), reacts smoothly with α,β-unsaturatedcarbonylcompounds (3)–(11) with a high degree of 1,2-regioselectivity to give 3-hydroxy-1, 5-dienes (12)–(20) in good to excellent yields.
Organomanganese (II) reagents XX: Manganese mediated Barbier and Reformatsky like reactions an efficient route to homoallylic alcohols and β-acetoxyesters
作者:Gérard Cahiez、Pierre-Yves Chavant
DOI:10.1016/s0040-4039(00)70700-3
日期:1989.1
Allylic halides and α-bromoesters react with manganese metal in ethyl acetate; THF can also be used as solvent if a catalytic amount of zinc chloride is added to the reaction mixture. When the reaction is performed in the presence of various aldehydes or ketones, excellent yields of 1,2-addition products are obtained in preparative conditions.