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Two major alkaloids from Buxus sempervirens, cyclovirobuxine-D and cyclobuxine-D, were found to be radioactively labelled following administration of mevalonic acid [2-14C,(4R)-4-3H1] to freshly-harvested shoots. The 3H: 14C atomic ratio of 3:4 in cyclovirobuxine-D indicated a biosynthetic pathway from cycloartenol involving 3-ketone and 20-ketone intermediates. A 3H: 14C atomic ratio of ca 3:3 in cyclobuxine-D suggests that the 4α-methyl group of cycloartenol is lost in its formation, and this conforms with current theories of the sequence of C-4 demethylation of sterols. 相似文献
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