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Chiral ammonium ketene enolates reaction

Reactions of Chiral Ammonium Ketene Enolates as Nucleophiles with Different Electrophiles... [Pg.86]

Cinchona alkaloids such as 121 possess a nucleophilic quinuclidine structure and can act as versatile Lewis bases to react with ketenes generated in situ from acyl halides in the presence of an add scavenger. By acting as nucleophiles, the resulting ketene enolates can react intermolecularly [53] or intramolecularly [54] with electrophilic C=0 or C=N bonds to deliver formal [2 + 2]-cycloadducts, such as chiral P-lactones or [1-lactams, via aldol (or Mannich)-i intramolecular cydization sequence reactions (Scheme 8.46). The nucleophilic ammonium enolate can also read with energetic... [Pg.228]

See other pages where Chiral ammonium ketene enolates reaction is mentioned: [Pg.171]    [Pg.324]    [Pg.80]    [Pg.199]    [Pg.270]    [Pg.112]    [Pg.1354]    [Pg.619]    [Pg.509]   
See also in sourсe #XX -- [ Pg.86 , Pg.87 , Pg.88 , Pg.89 , Pg.90 , Pg.91 ]



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Ammonium chiral

Ammonium enolate

Ammonium enolates

Ammonium ketene enolate

Chiral Ketenes

Chiral enolate

Chiral ketene enolates

Enolates chiral

Ketene enolate

Ketene reaction

Ketenes reactions

Reaction ammonium

Reactions chiral

Reactions of Chiral Ammonium Ketene Enolates as Nucleophiles with Different Electrophiles

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