Tan Z, Chen T, Zhu J, Luo W, Yu D, Guo W. Visible Light Mediated Chemoselective Hydroxylation of Benzylic Methylenes.
J Org Chem 2024;
89:2656-2664. [PMID:
38324782 DOI:
10.1021/acs.joc.3c02683]
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Abstract
We have developed a metal-free photocatalytic selective hydroxylation of benzylic methylenes to secondary alcohols. This approach utilizes low-cost eosin Y as photocatalyst, O2 as green oxidant, and inexpensive triethylamine as inhibitor for overoxidation. The mild reaction conditions enable the production of secondary alcohols with 56-95% yields, making it a promising and environmental-friendly method for the synthesis of secondary alcohols from benzylic methylenes.
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