BPh<sub>3</sub>-Catalyzed [2+3] Cycloaddition of Ph<sub>3</sub>PCCO with Aldonitrones: Access to 5-Isoxazolidinones with Exocyclic Phosphonium Ylide Moieties
作者:Amandeep Brar、Daniel K. Unruh、Natalie Ling、Clemens Krempner
DOI:10.1021/acs.orglett.9b02192
日期:2019.8.16
exocyclic phosphonium ylide functionalities via [2+3] cycloaddition of Ph3PCCO and aldonitrones has been developed and applied in the synthesis of 4-alkylidene-5-isoxazolidinones viaWittig olefination. The reaction proceeds by BPh3 catalysis under mild conditions and with a broad substrate scope. A reaction pathway involving the activation of the aldonitrone via interactions with the Lewis acid BPh3 is
Regiochemistry of mercury(II) oxide oxidation of unsymmetrical N,N-disubstituted hydroxylamines
作者:Sk.Asrof Ali、S.M. Azhar Hashmi、Mohammad N. Siddiqui、Mohammed I.M. Wazeer
DOI:10.1016/0040-4020(96)00904-0
日期:1996.11
Mercury(II) oxideoxidation of N,N-disubstituted hydroxylamines with the α and α′ carbon atoms containing one and two hydrogen atoms, respectively, gave aldonitrones in a highly regioselective manner. Removal of the α proton is involved in the rate determining step as shown by primary kinetic isotope effect.
[EN] SMALL MOLECULE DCN1 INHIBITORS AND THERAPEUTIC METHODS USING THE SAME<br/>[FR] INHIBITEURS DE DCN1 À PETITES MOLÉCULES ET PROCÉDÉS THÉRAPEUTIQUES LES UTILISANT
申请人:UNIV MICHIGAN REGENTS
公开号:WO2018183411A1
公开(公告)日:2018-10-04
Compounds of formula (I) as inhibitors of DCNl and compositions containing the same are disclosed. Methods of using the DCNl inhibitors in the treatment of diseases and conditions wherein inhibition of DCNl provides a benefit, like oxidative stress-related diseases and conditions, neurodegenerative diseases and conditions, metabolic disorders, and muscular nerve degeneration, also are disclosed.
Nucleophilic addition reactions of soft carbon nucleophiles to nitrones in a flow microreactor are reported for the first time. Under microflow conditions at 30 to 0 °C, a range of nitrones can be efficiently transformed into the corresponding oxyiminium ions by reaction with either acyl halides or trialkylsilyl triflates. These can subsequently undergo the addition of nucleophiles including allyltributylstannane
首次报道了在流动微反应器中软碳亲核试剂与硝酮的亲核加成反应。在 30 至 0 °C 的微流条件下,通过与酰卤或三烷基甲硅烷基三氟甲磺酸酯反应,可以将一系列硝酮有效地转化为相应的氧亚胺离子。这些随后可以添加亲核试剂,包括烯丙基三丁基锡烷、烯酮甲基叔丁基二甲基甲硅烷基乙缩醛和 N-甲硅烷基烯酮亚胺,以高产率提供相应的加合物;由于不希望有的副反应,在类似温度下在分批条件下的此类反应导致较低的产率。
(3 + 3) Cycloaddition of Oxyallyl Cations with Nitrones: Diastereoselective Access to 1,2-Oxazinanes
作者:Marie Cordier、Alexis Archambeau
DOI:10.1021/acs.orglett.8b00617
日期:2018.4.20
Oxyallylcations are prepared in situ from readily available α-tosyloxy ketones and act as transient electrophilic partners in (3 + 3) cycloaddition with nitrones. Under mild conditions, this method provides a chemoselective and diastereoselective route to polysubstituted 1,2-oxazinanes. A stepwise process is proposed to rationalize the diastereoselectivity of this transformation.