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.
Homoallylic alcohols from samarium diiodide-mediated coupling of allylic sulfones with carbonyl compounds
作者:Jonathan Clayden、Marc Julia
DOI:10.1039/c39940002261
日期:——
Reduction of allylic sulfones with samarium diiodide gives allylsamarium species which react in situ with carbonyl compounds, yielding homoallylic alcohols.
三碘化二钐还原烯丙基砜生成烯丙基钐物种,该物种可原地与羰基化合物反应,生成高烯丙醇。
Allylic sulfones as allyl anion equivalents: homoallylic alcohols from metal catalysed reactions of sulfones with aldehydes and ketones
作者:Jonathan Clayden、Marc Julia
DOI:10.1039/c39940001905
日期:——
Reduction of allylic sulfones with diethylzinc, catalysed by palladium(0), gives nucleophilic organometallic species, which react in situ with carbonyl compounds to give homoallylic alcohols in high yield.
to produce unisolable allylchromium species which add efficiently to aldehydes or ketones with high degree of stereo- and chemoselectivity. Particularly, high threo selectivity is observed in the reaction of aldehydes and 1-bromo-2-butene and is ascribed to a chair-like six-membered transition state. Simple reduction of allylic and benzylic halides produces biallyls and bibenzyls, while gem-dibromocyclopropanes
Investigations of the Scope and Mechanism of the Tandem Hydroesterification/Lactonization Reaction
作者:Lijun Wang、Paul E. Floreancig
DOI:10.1021/ol048378f
日期:2004.11.1
alcohols and 2-pyridylmethyl formate in the presence of Ru(3)(CO)(12) initiates a tandem sequence of hydroesterification and lactonization. Mechanistic studies suggest that regioselectivity and overall reaction efficiency are governed by the relative rates of reductive elimination and beta-hydride elimination for the alkylruthenium intermediates.