Journal
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
Volume 2018, Issue 37, Pages 5222-5230Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejoc.201801139
Keywords
Asymmetric synthesis; Oxygenation; Radical reactions; Tandem reactions; Total synthesis
Categories
Funding
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences [RVO: 61388963]
- Grant Agency of the Czech Republic [13-40188S]
- Gilead Sciences research center at IOCB
- European Regional Development Fund
- Ministry of Education, Youth and Sports of the Czech Republic [MSM0021620857]
- OP RDE [CZ.02.1.01/0.0/0.0/16_019/0000729]
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anti-beta-Amino-beta-(aminoxy) esters or amides are synthesized by merging polar asymmetric aza-Michael additions of lithium 1-phenylethylamides to ,-unsaturated carboxylic acid derivatives and diastereoselective radical couplings with the persistent free radical TEMPO mediated or catalyzed by ferrocenium hexafluorophosphate. Aliphatic ,-unsaturated carboxylic derivatives gave good to excellent anti-diastereoselectivity for the radical coupling step, whereas the selectivity remained lower for cinnamic acid derivatives. The method allows the convenient introduction of a protected oxygen functionality, which is stable to acidic, basic, hydride and hydrogenolytic reductive conditions, but can be deprotected with zinc and acetic acid in the presence of TBDMS and Boc groups without noticeable epimerization. The tandem aza-Michael/oxygenation strategy was applied in total syntheses of the T(H)2 cytokine secretion modulator cytoxazone, and dipeptide fragments of the anti--amino--hydroxy acid containing macrocyclic peptides perthamide C and largamide H.
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