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Darzen’s condensation

Darzen s reaction org chem Condensation of aldehydes and ketones with a-haloesters to produce glycidic esters. dar-zonz re.ak-shon ... [Pg.101]

The asymmetric Darzens condensation, which involves both carbon-carbon and carbon-oxygen bond constructions, was realized by use of the chiral azacrown ether 75als2,s ,ss and the quaternary ammonium salts derived from cinchona alka-loids159"621 under phase transfer catalyzed conditions. The a,p-epoxy ketone 80 (R=Ph) was obtained with reasonable enantioselectivity by the reaction of... [Pg.135]

S. Arai, T. Shioiri, Catalytic Asymmetric Darzens Condensation under Phase-Transfer-Catalyzed Conditions , Tetrahedron Lett. 1998, 39, 2145-2148. [Pg.142]

Dalton s law of partial pressures, 12 Darzens glycidic ester condensation, 906J, 907... [Pg.1172]

Colonna et al. reported that up to 62% ee can be achieved when the Darzens condensation of aromatic aldehydes with phenacyl chlorides is carried out in the presence of bovine serum albumin R. Annunziata, S. Banfi, S. Colonna, Tetrahedron Lett. 1985, 26, 2471-2474. [Pg.242]

The Darzens reaction involves a two-step, base-catalyzed condensation of ethyl chloroacetate with a ketone to yield an epoxy ester. The first. step is a carhonyl condensation reaction, and the second step is an Si -2 reaction. Write both step.s, and show their mechanisms. [Pg.913]

The Darzens Glycidic Ester Condensation Melvin S. Newman and Barney J. Magerlein... [Pg.418]

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See also in sourсe #XX -- [ Pg.7 , Pg.260 , Pg.323 , Pg.359 , Pg.414 ]



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