Add time:08/20/2019         Source:sciencedirect.com

The methyl Z-2-acetamido(or benzamido)-3-aryl-2-butenoates (Z-9a-e,Z-10a-e) were obtained by two alternative procedures: stereo-specific opening of Z-2-methyl(or phenyl)-4-|α -arylethylidene|-5(4H)-oxazolones (Z-7a-e,Z-8a-e) and stereospecific homologation of methyl Z-2-acetamido (or benzamido)-3-aryl-2-propenoates (Z-3a-e, Z-4a-e). The methyl E-2-benzamido-3-aryl-2-butenoates (E-10a-e) were obtained by stereospecific opening of E-2-phenyl-4-|α-arylethylidene|-5(4H)-oxazolones (E-8a-e).

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