Efficient assembly of 3-substituted oxindole-based isoxazolines leading to the synthesis of (±)-flustraminol-B and related natural product building blocks
摘要:
An efficient synthesis of oxindole-based isoxazolines has been developed and the resulting spirocyclic intermediates have been elaborated to synthetically versatile 3-hydroxy-3-alkyl oxindole building blocks such as the 3-hydroxy-3-methylenecyano-2-oxindoles (6) and gamma-amino alcohols (12). Utility of this methodology is demonstrated through the synthesis of pyrrolo[2,3-b]indolines including the marine natural product (+/-)-flustraminol-B. (C) 2012 Elsevier Ltd. All rights reserved.
Efficient assembly of 3-substituted oxindole-based isoxazolines leading to the synthesis of (±)-flustraminol-B and related natural product building blocks
作者:Anand Singh、Gregory P. Roth
DOI:10.1016/j.tetlet.2012.07.005
日期:2012.9
An efficient synthesis of oxindole-based isoxazolines has been developed and the resulting spirocyclic intermediates have been elaborated to synthetically versatile 3-hydroxy-3-alkyl oxindole building blocks such as the 3-hydroxy-3-methylenecyano-2-oxindoles (6) and gamma-amino alcohols (12). Utility of this methodology is demonstrated through the synthesis of pyrrolo[2,3-b]indolines including the marine natural product (+/-)-flustraminol-B. (C) 2012 Elsevier Ltd. All rights reserved.
Copper-Catalyzed Selective <i>N</i>-Vinylation of 3-(Hydroxyimino)indolin-2-ones with Alkenyl Boronic Acids: Synthesis of <i>N</i>-Vinyl Nitrones and Spirooxindoles
作者:Chun-Hua Chen、Qing-Qing Liu、Xiao-Pan Ma、Yu Feng、Cui Liang、Cheng-Xue Pan、Gui-Fa Su、Dong-Liang Mo
DOI:10.1021/acs.joc.7b00620
日期:2017.6.16
A copper-catalyzed selective cross-coupling reaction of 3-(hydroxyimino)indolin-2-ones with alkenylboronicacids to access (E)-N-vinyl oxindole nitrones has been achieved under mild conditions. The studies showed that catalytic copper salt selectively gave mono N-vinylation products, while 2.0 equiv of copper salt provided double N-vinylation products. The control experiments revealed that the carbonyl