0000000000178922
AUTHOR
Yoseph Atilaw
Modified ent-Abietane Diterpenoids from the Leaves of Suregada zanzibariensis
The leaf extract of Suregada zanzibariensis gave two new modified ent-abietane diterpenoids, zanzibariolides A (1) and B (2), and two known triterpenoids, simiarenol (3) and β-amyrin (4). The structures of the isolated compounds were elucidated based on NMR and MS data analysis. Single-crystal X-ray diffraction was used to establish the absolute configurations of compounds 1 and 2. The crude leaf extract inhibited the infectivity of herpes simplex virus 2 (HSV-2, IC50 11.5 μg/mL) and showed toxicity on African green monkey kidney (GMK AH1) cells at CC50 52 μg/mL. The isolated compounds 1–3 showed no anti-HSV-2 activity and exhibited insignificant toxicity against GMK AH1 cells at ≥100 μM. p…
Prenylated Flavonoids from the Roots of Tephrosia rhodesica
Five new compounds—rhodimer (1), rhodiflavan A (2), rhodiflavan B (3), rhodiflavan C (4), and rhodacarpin (5)—along with 16 known secondary metabolites, were isolated from the CH2Cl2–CH3OH (1:1) extract of the roots of Tephrosia rhodesica. They were identified by NMR spectroscopic, mass spectrometric, X-ray crystallographic, and ECD spectroscopic analyses. The crude extract and the isolated compounds 2–5, 9, 15, and 21 showed activity (100% at 10 μg and IC50 = 5–15 μM) against the chloroquine-sensitive (3D7) strain of Plasmodium falciparum. peerReviewed
CCDC 1987379: Experimental Crystal Structure Determination
Related Article: Yoseph Atilaw, Lois Muiva-Mutisya, Jonathan Bogaerts, Sandra Duffy, Arto Valkonen, Matthias Heydenreich, Vicky M. Avery, Kari Rissanen, Máté Erdélyi, Abiy Yenesew|2020|J.Nat.Prod.|83|2390|doi:10.1021/acs.jnatprod.0c00245