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Ring closure 4-pyrones, condensed

Double ring closure to condensed 4-pyrones s. 16, 822 Zl -N-Heterocyclics from aminocarboxylic acids Ji-Pyrrolines and J -piperideines s. 18, 838 4-Hydroxyquinolines from ar. amines... [Pg.245]

Pyrone ring synthesis and degradation Double ring closure to condensed 4-pyrones... [Pg.195]

Schulte and coworkers (62AP801) have prepared a number of 3-propargyl-4-hydroxy-2-pyrone derivatives (210) by condensation of /3-dicarbonyl compounds (208) with propargyl-malonyl chloride (209). On heating (210) with zinc carbonate, ring closure took place to give the corresponding furo[3,2-c]pyrone derivatives (211 Scheme 40). [Pg.993]

Formation of the 5,6-bond is also involved in the Claisen condensation between diethyl oxalate and an a,/3-unsaturated ester at its 7 position, to generate an intermediate in which ring closure via the ketone enol produces a 2-pyrone. ... [Pg.163]

See other pages where Ring closure 4-pyrones, condensed is mentioned: [Pg.45]    [Pg.359]    [Pg.359]    [Pg.359]    [Pg.283]    [Pg.217]   
See also in sourсe #XX -- [ Pg.16 ]

See also in sourсe #XX -- [ Pg.16 ]



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2-pyrone rings

4-Pyrones closure

4-Pyrones condensation

Condensed rings

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