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5H-oxazol-4-ones

Br0nsted Base Catalyzed Aldol Reaction of 5H-Oxazol-4-ones... [Pg.821]

The chiral bicyclic guanidine 170 acts as a Bronsted base catalyst. The hydroxy group controls diastereo- and enantioselectivities in the direct aldol reaction of 5H-oxazol-4-ones (169) with aldehydes (62). The aldol products (171) are easily converted into amides or esters without loss of enantiopurity thus, this method provides synthetically usefiil a,p-dihydroxycarboxylates bearing a chiral quaternary stereogenic center at the a-carbon atom (Scheme 28.18) [88]. [Pg.821]

Scheme 28.18 Cuanidine-base-catalyzed aldol reaction of 5H-oxazol-4-ones. Scheme 28.18 Cuanidine-base-catalyzed aldol reaction of 5H-oxazol-4-ones.
Oxazol-4(5H)-one, 5-acetyl-5-methyl-synthesis, 6, 225 Oxazol-4(5H)-one, 2-phenyl-photorearrangement, 6, 200 synthesis, 6, 225 Oxazol-5(2ff)-one, 2-acyl-2,4-disubstituted pyrolysis, 6, 200 Oxazol-5(2H)-one, allyl-photochemical rearrangement, 6, 200 Oxazol-5(2H)-one, 2-arylmethylene-synthesis, 6, 227... [Pg.730]

See other pages where 5H-oxazol-4-ones is mentioned: [Pg.274]    [Pg.1421]    [Pg.274]    [Pg.274]    [Pg.1421]    [Pg.274]    [Pg.184]    [Pg.730]    [Pg.990]    [Pg.730]    [Pg.990]    [Pg.378]    [Pg.98]    [Pg.666]    [Pg.1096]   
See also in sourсe #XX -- [ Pg.274 , Pg.275 , Pg.821 ]



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