22425-77-0Relevant articles and documents
Remote hydroxylation of methyl groups by regioselective cyclopalladation. Partial synthesis of hyptatic acid-A
Garcia-Granados, Andres,Lopez, Pilar E.,Melguizo, Enrique,Parra, Andres,Simeo, Yolanda
, p. 3500 - 3509 (2008/02/03)
(Chemical Equation Presented) Hyptatic acid-A (32), a 2α,3β,24- trihydroxyolean-12-en-28-oic acid, previously isolated from Hyptis capitata, was obtained from maslinic acid (2). The regioselective cyclopalladation of the axial methyl group on C-4 of maslinic acid afforded the C-24 hydroxymethylene group due to the presence of a C-2-OR substituent. Nevertheless, hederagenin (7) (23-hydroxy derivative) was formed when this oxygenated group was not present.
Semi-synthesis of triterpene A-ring derivatives from oleanolic and maslinic acids. Part II. Theoretical and experimental 13C chemical shifts
Garcia-Granados, Andres,Duenas, Jose,Melguizo, Enrique,Moliz, Juan N.,Parra, Andres,Perez, Felipe L.
, p. 653 - 670 (2007/10/03)
Maslinic acid was obtained from olive-pressing residues, an several derivatives were formed. Rearrangements of 2-tosyloxy-derivatives of methyl maslinate made out by acetolysis. The main product of these rearrangements contained a cyclopentanic A-ring as
