Synthesis of Oxazolidin-4-ones: Domino <i>O</i>-Alkylation/Aza-Michael/Intramolecular Retro-Claisen Condensation
作者:Abderrahman El Bouakher、Ronan Le Goff、Jordan Tasserie、Jérôme Lhoste、Arnaud Martel、Sébastien Comesse
DOI:10.1021/acs.orglett.6b00851
日期:2016.5.20
An original and rapid domino reaction for access to oxazolidin-4-ones is presented. Simply by heating α-bromoamido alcohol in the presence of KNaCO3 and water with readily prepared Michael acceptors, an unprecedented molecular rearrangement is generated. This new methodology enables the hitherto unreported synthesis of functionalized oxazolidin-4-ones. The process was proved to be compatible with a
Chemo-, Regio-, and Stereoselective Synthesis of Polysusbtituted Oxazolo[3,2-<i>d</i>][1,4]oxazepin-5(3<i>H</i>)ones via a Domino oxa-Michael/aza-Michael/Williamson Cycloetherification Sequence
作者:Abderrahman El Bouakher、Jordan Tasserie、Ronan Le Goff、Jérôme Lhoste、Arnaud Martel、Sébastien Comesse
DOI:10.1021/acs.joc.7b00629
日期:2017.6.2
proved to be chemo-, regio-, and stereoselective and allows the formation of a large diversity of highly functional 7-membered rings in good yields up to 95%. The complete shift of the regioselectivity of the intermediate enolate from a C–C to a C–O bond formation, contrary to the already known alkylations of such ambident nucleophiles, is mostly triggered by stericeffects. The last step of the sequence
提出了在温和条件下从α-溴酰胺基醇和Michael受体开始合成新的oxazolo [3,2- d ] [1,4] oxazepin-5(3 H)-的方法。事实证明,这种多米诺骨牌工艺具有化学选择性,区域选择性和立体选择性,并且可以形成高达95%的高收率的多种多样的高功能7元环。中间烯醇的区域选择性从C–C到C–O键形成的完全转变与这种环境友好的亲核试剂的已知烷基化相反,主要是由空间效应触发的。序列的最后一步是通过DFT建模的,从而给出了该C–C与C–O键移位的一些重要见解。
Highly Stereoselective Domino Oxa-Michael/Aza-Michael/Cyclization: Synthesis of Bicyclic Lactams and Spirooxindole Skeleton
作者:Ronan Le Goff、Morgane Sanselme、Ata Martin Lawson、Adam Daïch、Sébastien Comesse
DOI:10.1002/ejoc.201501072
日期:2015.11
oxazolo-pyrrolidinones, including a quaternary carbon stereocenter, is described. This was achieved by using a domino process between hydroxy halogenoamides and various Michael acceptors. This strategy provided good to high yield and selectivity. Application to the diastereoselective synthesis of an enantioenriched spirooxindole skeleton in high yield and selectivity is also presented.