The crude alkaloids (37.0 g) were chromatographed on a
neutral alumina column ( 6 45 cm, about 800 g) eluted with
gradient mixtures of Et2O-MeOH (from 100:1 to 1:1) to give
six major fractions (F1-F6). F1 (8.27 g) was subjected to a
silica gel column eluted with CHCl3-MeOH (100:1 to 40:1) to
afford three major subfractions, F1a-F1c. F1a was extensively
chromatographed on a silica gel column (CHCl3-MeOH, 70:
1) to obtain 1 (50 mg), 2 (155 mg), and 6 (18 mg). F1b was
purified on a silica gel column (petroleum ether-EtOAc-Et2-
NH, 7:1:0.3) and then preparative TLC (CHCl3-MeOH, 50:1)
to give 3 (86 mg).
The crude alkaloids (37.0 g) were chromatographed on aneutral alumina column ( 6 45 cm, about 800 g) eluted withgradient mixtures of Et2O-MeOH (from 100:1 to 1:1) to givesix major fractions (F1-F6). F1 (8.27 g) was subjected to asilica gel column eluted with CHCl3-MeOH (100:1 to 40:1) toafford three major subfractions, F1a-F1c. F1a was extensivelychromatographed on a silica gel column (CHCl3-MeOH, 70:1) to obtain 1 (50 mg), 2 (155 mg), and 6 (18 mg). F1b waspurified on a silica gel column (petroleum ether-EtOAc-Et2-NH, 7:1:0.3) and then preparative TLC (CHCl3-MeOH, 50:1)to give 3 (86 mg).
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