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Ursene

The methyl resonances in the proton spectra of a series of ursenes have been assigned. "... [Pg.178]

Amyrin (ursene triterpene) Cycnomorium songaricum (Cynomoriaceae) HIV-1 protease (> 100 pM) (Collagenase) [53]... [Pg.574]

Uvaol (= Urs-12-ene-3,28-diol) (ursene triterpene) Crataegus pinatifida (Rosaceae) HIV-1 protease (6 pM) [57]... [Pg.575]

Viminalol) (ursene Balanophora elongata (Balanophoraceae), CDPK, collagenase, PKA,... [Pg.534]

Triterpenic Acids. The following pentacyclic mono- and dihydroxy triterpenic acids are present in virgin olive oil (35, 43, 44) 3p-hydroxy-17-carboxy-5-12-olea-nene (oleanolic acid) 3 3,2a-dihydroxy-17-carboxy-5-12-oleanene (maslinic acid) 3p-hydroxy-17-carboxy-8-12-ursene (ursolic acid) 2a,3p-dihydroxy-17-carboxy-5-12-ursene (2a-hydroxyursolic acid) and deoxyursolic acid (structure not fully elucidated). [Pg.959]

Olean-12-enes are converted into the corresponding 12-chloro-derivatives, e.g. (121), on reaction with a gaseous mixture of nitrosyl chloride and chlorine in pyridine solution. This method has been used to separate natural mixtures of oleanenes and ursenes since the latter are inert under these conditions. The glycyrrhetic acid derivative (122) afforded the fluorinated product (123) on treatment with CF3OF at —70 °C. (123) decomposed readily in polar solvents to give a rearranged product which has been assigned the novel structure (124). [Pg.146]

Some resonances in the ursene series have been reassigned.The labelling pattern in ursolic acid and 2a-hydroxyursolic acid isolated from tissue cultures of Isodon japonicus fed with sodium [l,2- C]acetate conforms with the original Ruzicka hypothesis for the biogenesis of pentacyclic triterpenoids. [Pg.150]

Ursolic acid (= Malol Malolic acid Micromerol Prunol Urson) (ursene triterpene) Widespread Cynomoriuin songaricum (Cynomoriaceae), Arctostaphylos uva-ursi, (Ericaceae) HIV-1 protease (8 pM 85% inhibition at 39 pM) (Elastase) [49, 53, 55, 571... [Pg.575]

The two main triterpene dialcohols in olive oil are erythrodiol (homo-olestranol, 5a-olean-12-ene-3 3,28-diol) and uvaol (A-12-ursen-3(>,28-diol) (Figure 9.7). [Pg.255]

New ursene derivatives include acuminatic acid (192) (2a,3a,19a-trihydroxy-urs-12-en-28-oic acid) from Pygeum acuminatum, 2a,3a,19a,23-tetra-hydroxyursolic acid (193) from the leaves of Coleus ambionicus, and... [Pg.212]

See other pages where Ursene is mentioned: [Pg.108]    [Pg.574]    [Pg.574]    [Pg.575]    [Pg.139]    [Pg.534]    [Pg.535]    [Pg.535]    [Pg.535]    [Pg.580]    [Pg.75]    [Pg.157]    [Pg.1037]    [Pg.353]    [Pg.292]    [Pg.292]    [Pg.149]    [Pg.574]    [Pg.574]    [Pg.852]    [Pg.878]   


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Ursene hydroxy

Ursolic acid methyl ester (ursene

Uvaol (ursene

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