2-(Tetrahydropyran-2-yl)hydroxyanthraquinones have been produced in high yield by treatment of hydroxyanthraquinones with 2-hydroxytetrahydropyrans and with either (S)-(–)-proline or (S)-(–)-phenylalanine in dimethylformamide.
A. Castonguay and Y. Berger, J. Chem. Soc., Chem. Commun., 1978, 951 DOI: 10.1039/C39780000951
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