ABSTRACT
A novel hexanorditerpenoid, hedychin C (1), and a new diterpenoid, hedychin D (2), were isolated from the rhizomes of Hedychium forrestii. Their structures and absolute configurations were unambiguously established by means of extensive spectroscopic data (IR, UV, HRMS, and NMR) and electronic circular dichroism (ECD) calculations. This is the first report of naturally occurring labdane-type hexanorditerpenoid. Compound 1 was proved to have moderate cytotoxicity against XWLC-05 cell line with an IC50 value of 53.6 µM.
Subject(s)
Diterpenes , Zingiberaceae , Cell Line, Tumor , Circular Dichroism , Diterpenes/isolation & purification , Diterpenes/pharmacology , Humans , Magnetic Resonance Spectroscopy , Molecular Structure , Phytochemicals/isolation & purification , Phytochemicals/pharmacology , Rhizome/chemistry , Zingiberaceae/chemistryABSTRACT
Hedychins A (1) and B (2), two unprecedented 6,7-dinorlabdane ditepenoids with a peroxide bridge, were obtained from the rhizomes of Hedychium forrestii. Their structures and absolute configurations were unequivocally established by a combination of spectroscopic data and X-ray single-crystal diffractions. Their plausible biosynthetic pathway was proposed. Compound 2 exhibited cytotoxicity against HepG2 and XWLC-05 cell lines with IC50 values of 8.0 and 19.7 µM, respectively.
