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
Ring A Functionalization of Terpenoids by the Unusual Baeyer-Villiger Rearrangement of Aliphatic Aldehydes
作者:Alejandro F. Barrero、E. J. Alvarez-Manzaneda、R. Alvarez-Manzaneda、Rachid Chahboun、R. Meneses、Marta Aparicio B.
DOI:10.1055/s-1999-2722
日期:1999.6
A new methodology is described for transforming resinic acids into nor-alcohols and nor-olefins, via the Baeyer-Villiger rearrangement of the derived aldehyde. Based on this methodology 4-hydroxy-18-nor-abieta-8,11,13-trien-7-one and 18-nor-abieta-8,11,13-triene-4,7α-diol, two new terpenoids recently described, have been synthesized from abietic acid.
The intrinsic capability of squalene–hopenecyclases to convert (E)- or (Z)-substrates enantiospecifically to (S)- or (R)-configurated monocyclic terpenoids was put into action by a combination of enzyme evolution and substrate engineering for the synthesis of (S)- and (R)-γ-dihydroionone with >99 % ee.
角鲨烯-霍烯环化酶将( E )-或( Z )-底物对映专一地转化为( S )-或( R )-构型单环萜类化合物的内在能力通过酶进化和合成底物工程的结合而发挥作用( S )-和( R )-γ-二氢紫罗兰酮,>99% ee 。
Bestimmung der Chiralit�t der enantiomeren ?-Cyclogeraniums�uren, ?-Cyclogeraniale, ?-Jonone, ?-Jonone, ?-Carotine, ?-Carotine und verwandter Verbindungen durch chemische Verkn�pfungsreaktionen. Vorl�ufige Mitteilung
作者:C. H. Eugster、R. Buchecker、Ch. Tscharner、G. Uhde、G. Ohloff
DOI:10.1002/hlca.19690520627
日期:——
Die im Titel genannten enantiomeren Verbindungen sind durch chemische Reaktionen mit Ambrein und Manool verknüpft worden, so dass ihre Chiralität festgelegt ist. Damit ist zum erstenmal die Konfiguration eines chiralen Carotinoidkohlenwasserstoffes bestimmt. Das natürlich vorkommende (+)-α-Jonon hat R-Konfiguration, ebenso das natürliche (+)-α-Carotin.
死因对映异构体是化学反应,因此是手性的代表作。Damit ist zum erstenmal die Konfiguration eines chiralen Carotinoidkohlenwasserstoffes bestimmt。Dasnatürlichvorkommende(+)-α-Jononhat R -Konfiguration,ebenso dasnatürliche(+)-α-Carotin 。
Preparation of oxocene terpenes. The first enantiospecific synthesis of cytotoxic arenaran A
The first syntheses of cytotoxicmarine arenarans A and B starting from commercial (−)-sclareol are reported. The oxocene ring of the target compound is formed via ring-closing metathesis, a process that depends on certain structural requirements. The trans-fused structure of the naturalproduct is confirmed by comparison with the cis-fused isomer, which was synthesized. This synthetic strategy is