SCHEDULED MAINTENANCE
Activated charcoal treatment of physalin B, a 13, 14-seco-16,24-cyclosteroidal constituent of Physalis alkekengi, in MeOH at room temperature yields a product possessing a hydroxy group at the α-position of the δ-lactone carbonyl function, namely 25-hydroxyphysalin B, in high yield.
B. Makino, M. Kawai, T. Yamamoto, H. Yamamura, Y. Butsugan, M. Hayashi and K. Ogawa, J. Chem. Soc., Chem. Commun., 1992, 1430 DOI: 10.1039/C39920001430
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