Z. Du, N. Li, Y. Hua, Y. Shi, C. Bao, H. Zhang, Y. Yang, Q. Lin and L. Zhu,
Chem. Commun., 2017, Accepted Manuscript
, DOI: 10.1039/C7CC08225H
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A synthesis of C17α-OH-tigogenin, the aglycon of aspafiliosides E and F, is described. The main features of the synthesis are three cascade processes, which involve the iodo-lactonization of furostan-26-acid to open ring E, a cascade hydrolysis/intramolecular SN2 process to close ring E, and a cascade intramolecula
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