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Hydrazones esters

Condensation of 7-keto-ester hydrazones 475 with the Vilsmeier reagent yielded a general synthesis of l,3-diaryl-4-pyrazoleacetic acid esters 476 (Equation 95) <2005JHC131>. Regioselective addition of lithiated /3-hydrazono-phosphino oxides 477 to isocyanates afforded functionalized hydrazonoamides 478, which were then cyclized to 5-aminopyrazoles 479 with phosphorus oxychloride in the presence of triethylamine (Scheme 56) <1996T4123>. [Pg.70]

Aroylphenyiacetic acid is annulated by reaction with a hydrazine in boiling butanol or xylene—a more convenient reaction than that of the less readily obtained aroylphenylacetic ester hydrazone previously used. [Pg.158]

Amidrazones (s. a. N-Acyl-oxamic acid ester hydrazones) 18, 510... [Pg.233]

See other pages where Hydrazones esters is mentioned: [Pg.316]    [Pg.160]    [Pg.220]    [Pg.302]    [Pg.331]    [Pg.549]    [Pg.342]    [Pg.362]    [Pg.217]    [Pg.241]    [Pg.251]    [Pg.446]    [Pg.230]    [Pg.264]    [Pg.278]    [Pg.292]    [Pg.543]    [Pg.124]    [Pg.302]   
See also in sourсe #XX -- [ Pg.22 ]



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