Chiral oximes in asymmetric synthesis. Addition of organometallic reagents to o-(1-phenylethyl) aldoximes
作者:David S. Brown、Peter T. Gallagher、Andrew P. Lightfoot、Christopher J. Moody、Alexandra M.Z. Slawin、Elizabeth Swann
DOI:10.1016/0040-4020(95)00711-g
日期:1995.10
Addition of Grignard and organolithium reagents to O-(1-phcnylethyl) aldoximes in the presence of boron trifluoride etherate gives secondary hydroxylamines in 21–84% yield with up to 95% diastercomeric excess.
Cleavage Reactions of Alkoxy Radicals Produced by Anodic Oxidation of<i>t</i>-Alcohols
作者:Kazuhiro Maruyama、Katsuya Murakami
DOI:10.1246/bcsj.41.1401
日期:1968.6
oxidation of t-alcohols in water - dioxane - sodium hydroxide system has been examined. The possibility of production of t-alkoxy radicals by anodic oxidation of t-alcohols in the electrolytic system was found. The relative ease of bond scission of the intermediate t-alkoxy radical was determined by quantitative analysis of the mixture of ketones produced. The relativerates of cleavage decrease in the order:
Asymmetric Direct Vinylogous Michael Additions of Allyl Alkyl Ketones to Maleimides through Dienamine Catalysis
作者:Gu Zhan、Qing He、Xin Yuan、Ying-Chun Chen
DOI:10.1021/ol503017h
日期:2014.11.21
A directcatalyticasymmetric γ-regioselective vinylogousMichaeladdition of allyl alkyl ketones to maleimides has been developed through dienamine catalysis of a simple chiral 1,2-diphenylethanediamine, giving multifunctional products in excellent enantioselectivity and with high yields. The success of this catalytic strategy relies on the unique inducing effect of deconjugated β,γ-C═C bond, which
Synthesis of allylic ketones via acylation of allylic mercurials
作者:Richard C. Larock、Yong-de Lu
DOI:10.1016/s0040-4039(00)82448-x
日期:——
Allylic mercurials, readily available from allylic halides and mercury(O), react with acyl chlorides and AlCl3 under mild reaction conditions to afford high yields of allylic ketones.
Synthetic approaches to phomactins: Novel oxidation of homoallylic alcohols using tetra-n-propylammonium perruthenate
作者:Timothy J. Blackburn、Eric J. Thomas
DOI:10.1016/j.tet.2018.05.068
日期:2018.9
step in the synthesis was to be the epoxidation of this methylenecyclohexane that was hoped would lead to a 1-(hydroxymethyl)cyclohexene by rearrangement of the exocyclic epoxide, but the epoxidation was difficult to carry out regioselectively on advanced intermediates. However, oxidation of a 15-methylenebicyclo[9.3.1]pentadeca-3,7-dien-14-ol using tetra-n-propylammonium perruthenate and N-methylmorpholine-N-oxide