A Mechanochemical Zinc-Mediated Barbier-Type Allylation Reaction under Ball-Milling Conditions
作者:JieXiang Yin、Roderick T. Stark、Ian A. Fallis、Duncan L. Browne
DOI:10.1021/acs.joc.9b02876
日期:2020.2.21
A ball-milling-enabled zinc-mediatedBarbier-typeallylation reaction is reported. Notably, running the reaction in this manner renders it effective irrespective of the initial morphology of the zinc metal. The process is operationally simple, does not require inert atmospheres or dry solvents, and is reported over a range of aldehyde and ketone substrates; a gram-scale process is demonstrated.
Palladium-Catalyzed Coupling of Allyl Acetates with Aldehyde and Imine Electrophiles in the Presence of Bis(pinacolato)diboron
作者:Sara Sebelius、Olov A. Wallner、Kálmán J. Szabó
DOI:10.1021/ol035052i
日期:2003.8.1
(4) electrophiles to afford homoallylicalcohols (5a-h) and amines (6a-d), respectively. A particularly interesting mechanistic feature is that the allylic substitution of the transient allyl boronate with sulfon-imine requires palladium catalysis. This finding indicates that the formation of the homoallylic amine derivatives (6a-d) involves bis-allylpalladium intermediates.
giving a regioisomeric mixture of SN2 and SN2′ products. The ratio of SN2/SN2′ selectivity can be controlled by solvents; in the presence of polar solvents, such as N-butylpyrrolidone (NBP) and THF, the SN2′ product was mainly obtained, whereas the SN2 product was selectively prepared in solutions containing hexane. The vinylindium compound, generated by the reaction of allylic-type diindium reagents
制备了乙烯基和甲基铟酸酯复合物(硬脂酸酯),并研究了向肉桂酰溴的迁移趋势和区域选择性。乙烯基组更优选大于Me基团转移,给出的S上的区域异构体混合物Ñ 2和S Ñ 2'的产品。S N 2 / S N 2'选择性的比率可以通过溶剂来控制。在极性溶剂(例如N-丁基吡咯烷酮(NBP)和THF)存在下,主要获得S N 2'产物,而S N在含有己烷的溶液中选择性制备2种产物。由烯丙基型二铟试剂与亚胺反应生成的乙烯基铟化合物也被转化为相应的乙烯基吲哚,使其与烯丙基氯反应,得到三组分偶联产物。
Allylation of Aldehyde and Imine Substrates with In Situ Generated Allylboronates - A Simple Route to Enatioenriched Homoallyl Alcohols
作者:Sara Sebelius、Kálmán J. Szabó
DOI:10.1002/ejoc.200500069
日期:2005.6
Allylation of aldehyde and imine substrates was achieved using easily available allylacetates and diboronate reagents in the presence of catalytic amounts of palladium. This operationally simple one-pot reaction has a broad synthetic scope, as many functionalities including, acetate, carbethoxy, amido and nitro groups are tolerated. The allylation reactions proceed with excellent regio- and stereoselectivity
Organometallic reactions in aqueous media. Indium-mediated allylation of sulfonimines
作者:Tak Hang Chan、Wenshuo Lu
DOI:10.1016/s0040-4039(98)01926-1
日期:1998.11
Barbier-type allylation of sulfonimines with indium and allyl bromide to give homoallylic sulfonamides can be performed smoothly in organic solvents and in aqueousmedia. The regio- and the stereoselectivity of the reaction have been examined.