Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 142, Issue 9, Pages 4517-4524Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.0c00727
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Funding
- JSPS KAKENHI [JP15H05846, JP18H04263, 17H03972, 19K22501]
- Platform Project for Supporting Drug Discovery and Life Science Research (Basis for Supporting Innovative Drug Discovery and Life Science Research (BINDS)) from AMED [JP19am0101091]
- JSPS
- Grants-in-Aid for Scientific Research [19K22501, 17H03972] Funding Source: KAKEN
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We developed a chemoselective catalytic activation of carboxylic acid for a 1e(-) radical process. alpha-Oxidation of a variety of carboxylic acids, which preferentially undergo undesired decarboxylation under radical conditions, proceeded efficiently under the optimized conditions. Chemoselective enolization of carboxylic acid was also achieved even in the presence of more acidic carbonyls. Extensive mechanistic studies revealed that the cooperative actions of iron species and alkali metal ions derived from 4 angstrom molecular sieves substantially facilitated the enolization. For the first time, catalytic enolization of unprotected carboxylic acid was achieved without external addition of stoichiometric amounts of Bronsted base. The formed redox-active heterobimetallic enediolate efficiently coupled with free radical TEMPO, providing synthetically useful alpha-hydroxy and keto acid derivatives.
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