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Ketocarboxylic acid esters lactones

P-ketocarboxylic acid esters 43, 727 ketones, cyclic 44, 928 p-ketothiolic acid esters 43, 727 y-lactones 43,215... [Pg.219]

Their structures were mainly determined by spectral studies using EI-MS, IR, H-NMR, NOE, and CD spectra (75). They consist of a main spiroether moiety, corresponding to 1-oxaspiro[5. 5]undec-4-ene-8-one ring system, (including seven asymmetric centers and possessing a (Z)-olefin, a mefa-substituted phenol, and a P-ketocarboxylic acid functions) and a P-hydroxy-y-lactone moiety. Oscillatoxin Ds are present as esters of both moieties. On the other hand, aplysiatoxins are present as macro bis-lactones including a spiroacetal. We are interested in the relationship between oscillatoxins and aplysiatoxins from a biosynthetic point of view. [Pg.294]


See other pages where Ketocarboxylic acid esters lactones is mentioned: [Pg.36]    [Pg.33]    [Pg.161]    [Pg.300]    [Pg.315]    [Pg.259]    [Pg.486]    [Pg.486]   
See also in sourсe #XX -- [ Pg.31 , Pg.57 ]

See also in sourсe #XX -- [ Pg.31 , Pg.57 ]




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Esters lactones

Ketocarboxylic acids

Lactone esters

Lactones acid esters)

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