Six morphinane alkaloids, cephasamine (3),
cephakicine (4), tannagine (6),
14-episinomenine
(7), FK-3000 (8), and sinoacutine (9),
and five hasubanane alkaloids, cephatonine (5),
cepharamine (10), aknadinine (11), aknadicine
(12), and aknadilactam (13), were isolated
from
the tuber of Stephania cepharantha Hayata (Menispermaceae)
cultivated in Japan. Three of
these (3−5) were new alkaloids. Structures
were spectroscopically determined by comparison
of their 1H and 13C NMR data with that of
cephamonine (1), cephamuline (2), and other
known
alkaloids (6−13).
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