Allylation of Aldehydes and Imines: Promoted by Reuseable Polymer-Supported Sulfonamide of <i>N</i>-Glycine
作者:Gui-long Li、Gang Zhao
DOI:10.1021/ol0528235
日期:2006.2.1
[reaction: see text] A allylation of aldehydes and imines (generated in situ from aldehydes and amines) with allyltributyltin promoted by recoverable and reusable the polymer-supportedsulfonamide of N-glycine has been developed. Good to high yields were obtained in various cases. Most of the SnBu(3) residue can be recovered as Bu(3)SnCl. Highly stereoselective synthesis of N-Boc-(2S,3S)-3-hydroxy-2-phenylpiperidine
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.
Synthetic and Mechanistic Studies of Indium-Mediated Allylation of Imines in Ionic Liquids
作者:Man Chun Law、Tin Wai Cheung、Kwok-Yin Wong、Tak Hang Chan
DOI:10.1021/jo062198x
日期:2007.2.1
Aldimines derivedfrom aryl and non-enolizable aliphatic aldehydes were allylated with allyl bromide mediated by indium powder in [bpy][BF4] (bpy = N-butylpyridine) to give good yields of the corresponding homoallylic amines. Selective formation of monoallylated amines can be achieved by varying the amount of bromide ion additive in the form of [bpy][Br]. The transient organoindium intermediates, allylindium(I)
Unprecedented Nucleophilic Additions of Highly Polar Organometallic Compounds to Imines and Nitriles Using Water as a Non-Innocent Reaction Medium
作者:Giuseppe Dilauro、Marzia Dell'Aera、Paola Vitale、Vito Capriati、Filippo Maria Perna
DOI:10.1002/anie.201705412
日期:2017.8.14
inert atmospheres with dry volatile organic solvents and often low temperatures, the addition of highly polar organometallic compounds to non‐activated imines and nitriles proceeds quickly, efficiently, and chemoselectively with a broad range of substrates at room temperature and under air with water as the only reaction medium. Secondary amines and tertiary carbinamines are furnished in yields of up to
alcohol and amine derivatives catalyzed by 2,4,5,6-tetra(9H-carbazol-9-yl)isophthalonitrile (4CzIPN) was developed. This reaction delivered δ-fluoromethylated free alcohols and amines with in situ deprotection of benzyl protecting group under mild irradiation conditions. 4CzIPN was found to be a competent metal-free photoredox catalyst for activating several types of fluoromethylation reagents including
开发了由2,4,5,6-四(9 H-咔唑-9-基)间苯二甲腈(4CzIPN)催化的苄基保护的均丙醇和胺衍生物的加氢三氟甲基化。该反应递送δ-氟甲基化的游离醇和胺,并在温和的辐射条件下原位去保护苄基保护基。已发现4CzIPN是一种有效的无金属光氧化还原催化剂,可通过氧化猝灭活化CF 3 SO 2 Cl,Togni试剂和2-溴-2,2-二氟乙酸酯,以及通过CF 3 SO 2 Na活化几种类型的氟甲基化试剂。还原淬灭,以使简单的烯烃和迈克尔受体直接进行氢三氟甲基化。