Abstract
Using the recently developed route through di-t-butyl b-bilene-1,19-dicarboxylates, new syntheses of biliverdin-IXα dimethyl ester ( 1) and two related mono-vinyl-mono-ethyl isomers ( 2) and ( 3), are described. The two dihydro-derivatives of ( 1) are important in connection with biosynthetic studies of the origin of algal biliproteins.
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