Study on chemical constituents of Wedelia trilobata / 中国中药杂志

A new taraxer-based triterpenoid ester, taraxer-14-en-30-al-3β-O-palmitate(1), was isolated from the whole plant of Wedelia trilobata, along with six known compounds, ent-kaur-16-en-19-oic acid(2), 16α-hydroxy-ent-kauran-19-oic acid(3), tara-xerol(4), β-amyrin(5), 1β-acetoxy-4α, 9α-dihydroxy-6β-isobutyroxyprostatolide(6), and stigmasterol(7). Their structures were elucidated with use of a combination of spectroscopic techniques(IR, HR-ESI-MS, 1 D, 2 D NMR data) and chemical methods.

Chemical constituents of Scurrula parasitica / 中国中药杂志

A new triterpenoid ester, 7β-hydroxyl-hop-22(29)-en-3β-O-palmitate (1), was isolated from the stems and leaves of Scurrula parasitica parasitic on Nerium indicum, along with nine known compounds, uvaol (2), 3-epi-ursolic acid (3), 3β-hydroxyl-hop-22(29)-ene (4), 3β, 15α-dihydroxyl-lup-20(29)-ene (5), lup-20(29)-en-3-O-α-D-glucoside (6), stigmasterol-3-O-β-D-glucoside (7), digitoxin-3-O-α-D-glucoside (8), behenic acid (9), octacosyl alcohol (10). Their structures were elucidated using a combination of 1D and 2D NMR techniques (COSY, HMQC, and HMBC) and HR-ESI-MS analyses. Compounds 2-10 were isolated from this plant for the first time.