Total Synthesis of Natural Hyacinthacine C5 and Six Related Hyacinthacine C5 Epimers

Anthony W. Carroll, Kongdech Savaspun, Anthony C. Willis, Masako Hoshino, Atsushi Kato, Stephen G. Pyne*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

The total synthesis of natural (+)-hyacinthacine C5 was achieved, which allowed correction of its initially proposed structure, as well as six additional hyacinthacine C-type compounds. These compounds were readily accessible from two epimeric anti-1,2-amino alcohols. Keeping a common A-ring configuration, chemical manipulation occurred selectively on the B-ring of the hyacinthacine C-type products through methods of syn-dihydroxylation, SN2 ring-opening of a cyclic sulfate, and also employing either (R)- or (R,S)-α-methylallyl amine for the Petasis borono Mannich reaction. Our small analogue library was then assessed for its glycosidase inhibitory potency against a panel of glycosidases. (-)-6-Epi-hyacinthacine C5 and (+)-7-epi-hyacinthacine C5 (compound names are based on the corrected structure of hyacinthacine C5) proved most active, with inhibitory activities ranging between weak (IC50 = 130 μM) and moderate (IC50 = 9.9 μM) against the α-glucosidases of rat intestinal maltase, isomaltase, and sucrase, thus identifying potential new leads for future antidiabetic drug development.

Original languageEnglish
Pages (from-to)5558-5576
Number of pages19
JournalJournal of Organic Chemistry
Volume83
Issue number10
DOIs
StatePublished - 2018/05/18

ASJC Scopus subject areas

  • Organic Chemistry

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