1.
J Nat Prod
; 61(3): 405, 1998 Mar 27.
Artículo
en Inglés
| MEDLINE
| ID: mdl-9548884
RESUMEN
Axinastatin 4 from a marine sponge was synthesized by high-dilution BOP-Cl cyclization of Trp-Val-Pro-Leu-Thr-Pro-Leu in 94% yield (only 2.5% at normal dilution), showing the configurations of the last three amino acids to be S. Synthetic axinastatin 4 was devoid of cytostatic activity.
2.
J Nat Prod
; 62(2): 340-1, 1999 Feb.
Artículo
en Inglés
| MEDLINE
| ID: mdl-10075781
RESUMEN
The two cyclic hemiacetals of 30-hydroxyfriedelan-3-on-28-al (1R and 1S) were found in an undescribed Salacia species from Costa Rica and characterized by spectral methods.