Chemoselective Conversion from α-Hydroxy Acids to α-Keto Acids Enabled by Nitroxyl-Radical-Catalyzed Aerobic Oxidation
Keisuke Furukawa, Haruki Inada, Masatoshi Shibuya* and Yoshihiko Yamamoto
*Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan, Email: m-shibups.nagoya-u.ac.jp
K. Furukawa, H. Inada, M. Shibuya, Y. Yamamoto, Org. Lett., 2016, 18, 4230-4233.
DOI: 10.1021/acs.orglett.6b01964 (free Supporting Information)
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A chemoselective oxidation of α-hydroxy acids to α-keto acids is catalyzed by 2-azaadamantane N-oxyl (AZADO), a nitroxyl radical catalyst. The use of molecular oxygen as a cooxidant enables the desired chemoselective oxidation to α-keto acids, that are labile and can easily release CO2 under oxidation conditions.
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