The BuOH-soluble fraction of an EtOH extract of T. crispa
vines was chromatographed repeatedly using centrifugal
partition chromatography (CPC), Sephadex LH-20, and a
reversed-phase Lobar column to give three new (1−3) and nine
known (4−12) cis-clerodane-type furanoditerpenoids. The
known diterpenoids were identified as borapetosides A−F
(4−6, 12, 8, 9), columbin (10), and borapetols A (11) and B
(7).13−17 Although borapetoside C (6) had been reported,15 its
structure and some 1H and 13C NMR assignments were revised
in this study. The following describes the structural characterization
of compounds 1−3 and 6 and the hypoglycemic activity
of borapetosides A−C (4−6) on normal, streptozotocininduced
type 1 diabetic (T1DM) and diet-induced type 2
diabetic (T2DM) mice.
The BuOH-soluble fraction of an EtOH extract of T. crispavines was chromatographed repeatedly using centrifugalpartition chromatography (CPC), Sephadex LH-20, and areversed-phase Lobar column to give three new (1−3) and nineknown (4−12) cis-clerodane-type furanoditerpenoids. Theknown diterpenoids were identified as borapetosides A−F(4−6, 12, 8, 9), columbin (10), and borapetols A (11) and B(7).13−17 Although borapetoside C (6) had been reported,15 itsstructure and some 1H and 13C NMR assignments were revisedin this study. The following describes the structural characterizationof compounds 1−3 and 6 and the hypoglycemic activityof borapetosides A−C (4−6) on normal, streptozotocininducedtype 1 diabetic (T1DM) and diet-induced type 2diabetic (T2DM) mice.
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