All articles of this category Oxidation of N -Boc-2-amino-3-( p -methoxyphenyl)-propane derivatives with potassium peroxodisulfate (K 2 S 2 O 8 ) gave the cyclic carbamates with high threo selectivity. With the same reagent, 4-phenylbutanoic acids gave the corresponding lactones in fair yields by oxidation at the benzylic position, while the benzoylacetic acid esters afforded a mixture of threo ( dl )- and erythro ( meso )-2,3-bis(benzoyl)-1,4-butanedioic acid esters, both of which correspond to the lignan framework.
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Irie et al. (1990) studied this question.