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Enollactones

Accentuation of the p-acceptor of an enone by substitution with an iminium moiety greatly contributes to the facile intramolecular Michael addition involving an enolate. The reactive components are generated from an enollactone and an ynamine [133],... [Pg.115]

The Ferrier (II) reaction is quite efficient to form six membered carbocycles, but is unsuitable to prepare cyclopentitols. Five membered enollactone 14 was converted to the cyclopentanone derivative 16 as a single epimer upon treatment by LiAlH(OtBu)3 (Scheme 4) [41]. Spectroscopic studies established some mechanistic details. Accordingly, the hydride of the reducing agent rapidly added to the carbonyl and formed with the metal a stable alu-minate complex. The carbocydization occurred by protonation followed by fragmentation and aldol type cyclization process. [Pg.4]

Ebenso leicht lassen sich cyclische Enolester (Enollactone) hydrogenolytisch spalten, wobei z. B. beim Keto-enollacton der Dehydroabietinsaure gleichzeitig die Carbonyl-Gruppe hydrogenolysiert wird3 ... [Pg.388]

Enollactones. 2-Benzylidenecycloalkanones are subject to Baeyer-Villiger oxidation on reaction with SeOj-HjOj at room temperature. Selenium dioxide is present in a catalytic amount. [Pg.302]

Perchloric acid acetic anhydride Enollactones from ketocarboxylic acids s. 19,328 s. a. J. Org. Chem. 34, 2767 (1969)... [Pg.75]

Cyclic a, -ethyleneketones from enollactones Fujimoto-Belleau reaction... [Pg.481]

See other pages where Enollactones is mentioned: [Pg.325]    [Pg.208]    [Pg.208]    [Pg.448]    [Pg.457]    [Pg.474]    [Pg.491]    [Pg.237]    [Pg.474]    [Pg.474]    [Pg.483]    [Pg.56]    [Pg.57]    [Pg.89]    [Pg.209]    [Pg.227]    [Pg.227]    [Pg.255]    [Pg.260]    [Pg.262]    [Pg.283]    [Pg.53]    [Pg.165]    [Pg.191]    [Pg.250]    [Pg.253]    [Pg.254]    [Pg.255]    [Pg.261]    [Pg.261]    [Pg.270]    [Pg.487]    [Pg.232]    [Pg.276]    [Pg.279]    [Pg.279]    [Pg.294]    [Pg.549]   
See also in sourсe #XX -- [ Pg.302 ]



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7-Ketocarboxylic 7-enollactones

A-Benzylidene-y-enollactones

Enollactones carboxylic acids

Enollactones startg

Ketocarboxylic acids enollactones

Lactones enollactones

Y-Enollactones

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