Allylation of Carbonyl Compounds by Allylic Acetates Using a Cobalt Halide as Catalyst
作者:Corinne Gosmini、Paulo Gomes、Jacques Périchon
DOI:10.1055/s-2003-40999
日期:——
In acetonitrile as solvent and in the presence of a simple cobalt halide as catalyst, the reduction by zinc dust of a mixture of aldehydes or ketones and allylic acetates affords the corresponding homoallylic alcohols in good yields.
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。
Indium mediated allylation and propargylation reactions of dimethyl acetals and ketals
作者:Jin Sun Kwon、Ae Nim Pae、Kyung Il Choi、Hun Yeong Koh、Youseung Kim、Yong Seo Cho
DOI:10.1016/s0040-4039(01)00042-9
日期:2001.3
Indium mediated allylation and propargylation reactions of acetals and ketals with various allyl or propargyl bromides in aqueousmedia successfully provided the corresponding homoallylic or homopropargylic (and allenylic) alcohol, respectively, in moderate to good yields. Highly chemoselectiveallylation is also described. The ketal and aryl acetal could be selectively allylated over the aliphatic
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
synthesized from aldehydes or ketones and allylicacetates, using an electrochemical process catalyzed by iron complexes. We first studied the reactivity of allyl acetate, using N,N-dimethylformamide (DMF) or acetonitrile (AN) as solvent, FeBr(2) as catalyst, and Fe as the sacrificial anode. Then we tested the regioreactivity of crotyl acetate and other allylic derivatives.