Three new epoxytriterpenes, 14 beta ,15 beta -epoxy-21 beta -hydroxyserrata
n-3-one (1), 13 alpha ,14 alpha -epoxy-21 alpha -methoxy-serratan-3-one (2)
, and 13 alpha ,14 alpha -epoxy-3 beta -methoxyserratan-21 beta -ol (3), we
re isolated together with two known triterpenoids, 21 alpha -methoxyserrat-
13-en-3-one (4) and 21 beta -hydroxyserrat-14-en-3-one (5), from the cuticl
e of Picea jezoensis var. jezoensis. The structures of these new compounds
were established on the basis of spectral data (NMR, MS) and single-crystal
X-ray analyses (I and 2) and partial synthesis (2 and 3).