27-p-Coumaroyloxyursolic acid

J Nat Prod. 1999 Jul;62(7):1061-4.

Activity-guided isolation of triterpenoid acyl CoA cholesteryl acyl transferase (ACAT) inhibitors from Ilex kudincha.[Pubmed: 10425145 ]

METHODS AND RESULTS:
Activity-guided fractionation of a methanol extract of the leaves of Ilex kudincha led to the isolation of seven acyl CoA cholesteryl acyl transferase (ACAT) inhibitory triterpenes. Four of them were identified by spectroscopic methods as ulmoidol (4), 23-hydroxyursolic acid (5), 27-trans-p-coumaroyloxyursolic acid (6), and 27-cis-p-coumaroyloxyursolic acid (7), and three were new compounds named ilekudinols A-C (1-3). The structures of these new triterpenoids were elucidated as 2alpha, 3beta-dihydroxy-24-nor-urs-4(23),11-dien-28,13beta- olide (1), 2alpha, 3beta-dihydroxy-24-nor-urs-4(23),12-dien-28-oic acid (2), and 3beta, 24,28-trihydroxylupane (3).
CONCLUSIONS:
Compounds 1-7 showed potent inhibitory activity in the ACAT assay.

Planta Med. 2001 Oct;67(7):683-4.

Sterols, triterpenes and biflavonoids of Viburnum jucundum and cytotoxic activity of ursolic acid.[Pubmed: 11582553 ]

METHODS AND RESULTS:
The triterpenes ursolic acid (1), 27-p-Z-coumaroyloxyursolic acid (2), 27-p-E-coumaroyloxyursolic acid, alpha-amyrine-3-palmitate and lupeol-3-palmitate were isolated through a bioactivity-guided fractionation from the acetonic extract of the aerial parts of Viburnum jucundum Morton in addition to amentoflavone, an epimeric mixture at C-2 of 2,3-dihydroamentoflavone, beta-sitosterol and beta-sitosteryl glucopyranoside.
CONCLUSIONS:
Ursolic acid (1) was the only constituent that exhibited cytotoxic activity toward three human cancer cell lines in culture. This is the first phytochemical and cytotoxic analysis performed to this plant species.