Regioselective Catalytic Asymmetric C-Alkylation of Isoxazolinones by a Base-Free Palladacycle-Catalyzed Direct 1,4-Addition
作者:Tina Hellmuth、Wolfgang Frey、René Peters
DOI:10.1002/anie.201410933
日期:2015.2.23
asymmetric alkylations of isoxazolinones forming all‐C‐substituted quaternary stereocenters. The present studies were driven by the question of how to control the regioselectivity in the competition of different nucleophilic positions. The investigation of a direct 1,4‐addition uncovered that a sterically demanding palladacycle catalyst directs the reactivity in the absence of a base nearly exclusively to
Fast and Efficient Synthesis of 4-Arylidene-3-phenylisoxazol-5-ones
作者:Maryam Mirzazadeh、Gholam Hossein Mahdavinia
DOI:10.1155/2012/562138
日期:——
A convenient and easy synthesis of 4-arylidene-3-phenylisoxazol-5-ones by the three-component reaction of hydroxylamine, ethyl benzoylacetate and aromatic aldehydes in the presence of DABCO in refluxing ethanol is reported.
Asymmetric Construction of Bis‐Spirocyclic Pyrazolones Bearing Vicinal Quaternary Carbon Centers
作者:Mengjie Yang、Aiqi Xue、Xingfu Wei、Yue Huang、Jingping Qu、Baomin Wang
DOI:10.1002/ejoc.202400305
日期:2024.7
A catalytic asymmetric (3+2) cyclization of pyrazolone-based MBH adducts with alkylidenyl isoxazolones was presented by using DMAP-derived chiral catalyst, affording bis-spirocyclic pyrazolones bearing vicinal all-carbon quaternary stereocenters within an imbedded cyclopentene ring scaffold in good yields with excellent stereoselectivities under mild conditions.
New pathway to pyrrolidinones and pyrrolizidinones using aryl aldehydes, 3-phenyl-5-isoxazolone and secondary amino acids
作者:Neelakandan Vidhya Lakshmi、Paramasivan T. Perumal
DOI:10.1016/j.tetlet.2013.01.078
日期:2013.4
A novel and efficient approach to pyrrolidinones and pyrrolizidinones via a one-pot multicomponent reaction of aryl aldehydes, 3-phenyl-5-isoxazolone, sarcosine and L-proline, respectively in methanol under reflux condition is reported. (C) 2013 Elsevier Ltd. All rights reserved.