Reactivity of Chiral Sesquiterpene Synthons Obtained by the Degradation of Maslinic Acid from Olive‐Pressing Residues
摘要:
Maslinic acid, a naturally occurring compound isolated from the solid wastes of olive-oil pressing, was fragmented through the C-ring via oxidative procedures to obtain two structural fragments. The chemical behaviors of cis-decalin, from the D and E rings, and of trans-decalin fragments, from the A and B rings, were investigated in depth using several chemical and enzymatic reactions. These decalin chiral synthons are interesting intermediates to semisynthesize phenanthrene- and drimane-type compounds and natural tricyclic triterpenes.
Degradation of triterpenic compounds from olive-pressing residues. Synthesis of trans-decalin type chiral synthons
摘要:
Three seco-Gring triterpenic compounds were obtained from oleanolic or maslinic acids from olive-mill solid wastes by photochemical and chemical reactions. From these oleantriene compounds, different remarkable sesquiterpene and nor-sesquiterpene fragments such as 3beta-hydroxydrimenol (13) and epoxydecalone (16) were achieved through oxidative cleavages of the double bonds in the opened Gring. (C) 2003 Published by Elsevier Ltd.
Bioactive Compounds with Added Value Prepared from Terpenes Contained in Solid Wastes from the Olive Oil Industry
作者:Andres Parra、Pilar E. Lopez、Andres Garcia-Granados
DOI:10.1002/cbdv.200900023
日期:2010.2
pentacyclic triterpenes oleanolic acid and maslinic acid were isolated. These natural compounds were transformed into methyl olean‐12‐en‐28‐oate (5), which then was transformed into several seco‐C‐ring triterpene compounds by chemical and photolytic modifications. The triene seco‐products were fragmented through several oxidative procedures to produce, simultaneously, cis‐ and trans‐decalin derivatives, both
Oxidation of several triterpenic diene and triene systems. Oxidative cleavage to obtain chiral intermediates for drimane and phenanthrene semi-synthesis
作者:Andrés Garcı́a-Granados、Pilar E López、Enrique Melguizo、Andrés Parra、Yolanda Simeó
DOI:10.1016/j.tet.2004.03.008
日期:2004.4
An exhaustive oxidation study has been made with ozone, MCPBA and/or NaIO4/RuCl3 of several triterpenic diene and triene compounds from oleanolic and maslinic acids obtained from olive-oil pressing. Through several oxidative cleavages of the opened C-ring of these oleantrienes, different significant decalin-type chiral synthons were achieved. These sesquiterpene and nor-sesquiterpene products are of great interest because by means of several simple reactions they could lead to drimane, phenanthrene and tricyclic triterpene compounds. (C) 2004 Elsevier Ltd. All rights reserved.