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2-Pyrone ring

For a long period, a butenolide or a 2-pyrone ring in the 17y -position of the steroid system has been considered an essential feature for digitalis-like cardiotonic activity. However, it turned out that the unsaturated lactone ring can be replaced without loss of activity by some other moieties, including the 4-pyridazinyl group. [Pg.142]

The mechanism of ring formation from monoalkyne and heterocumulenes, catalysed by Ni(0) complexes, Lx Ni(0), has been proposed to involve one-step cycloaddition scheme (10) [103] and scheme (11) [104, 105] show the formation of the 2-pyrone ring in the alkyne reaction with carbon dioxide and the 2-pyridone ring in the alkyne reaction with isocyanate respectively ... [Pg.386]

Additionally, the position of the substituent on the 2-pyrone ring is an important factor in the enophilic reactivity of 2-pyrone, as clearly demonatrated by Liao and coworker (Scheme 5) <00OL2049>. [Pg.3]

Pyrimido[4,5-d]pyrimidine-2,4,5,7-tetrones 26,678 2H-Pyrimido[l,2-a]pyrimid-2-ones 26,485 2-Pyrone ring, 3,4-dihydro-... [Pg.277]

Acoxy-2-pyrone ring. 7-Nitrofluorene-l,9-dicarboxylic acid refluxed with acetyl chloride until after ca. 3 days the startg. m. has disappeared crude 9-nitro-l-acetoxy-2-oxa-3-oxo-2,3-dihydrofluoranthene. Y 89%. R. Kuhn and U. Breyer, B. 95, 111 (1962). [Pg.65]

In the family of [Fe°(CO)3( " -2-pyrone)] complexes, the least cytotoxic compound, CORM-F3, was also the one that showed the more favorable CO-release anti-infiammatory, and vasodilatory properties. The trigger of this CO release is not ascertained and the substitution pattern at the 2-pyrone ring controls the rate of CO release [91, 92]. [Pg.552]

The cyclization additions of acetylenes with carbon dioxide are the reactions to form the bicyclic compounds such as alkylene and heterocyclic ring (e.g., 2-pyrone ring) compounds, one of the reactions being shown in eq. (19.57) [68,102,103]. [Pg.430]

Ethylenecarboxylic acids from enollactones Reductive 2-pyrone ring opening... [Pg.25]

Pyrone ring opening, reductive 18, 57 Pyrones s. a. Polypyrono compounds... [Pg.270]

See other pages where 2-Pyrone ring is mentioned: [Pg.418]    [Pg.412]    [Pg.348]    [Pg.57]    [Pg.216]    [Pg.272]    [Pg.496]    [Pg.203]    [Pg.399]    [Pg.206]    [Pg.250]    [Pg.336]    [Pg.468]    [Pg.8]    [Pg.86]    [Pg.323]    [Pg.411]    [Pg.232]    [Pg.222]    [Pg.304]    [Pg.270]    [Pg.374]    [Pg.510]    [Pg.27]    [Pg.255]    [Pg.274]    [Pg.12]    [Pg.275]    [Pg.298]   
See also in sourсe #XX -- [ Pg.386 ]



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2-Pyrone ring opening, reductive

2-Pyrone ring synthesis

2-Pyrone ring-opening

2-Pyrones benzene ring

2-Pyrones ring synthesis

4-Pyrone 2- -6-phenyl-, ring

4-Pyrone ring 2,3-dihydro

4-Pyrone ring degradation

4-Pyrone ring opening with

4-Pyrones condensed, by double ring

4-Pyrones ring opening with base

Pyron-ring substituted coumarins

Pyrone ring Dihydropyrone

Pyrone via furan ring

Pyrone-ring construction

Ring closure 4-pyrones, condensed

Y-Pyrone ring

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