Syntheses of Some Biosynthetic Precursors to the Isocyclic Ring in Chlorophyll a
In connection with studies on the biosynthesis of the isocyclic ring E in chlorophyll a (1), the magnesium(II) 2,4-divinylporphyrin β-keto ester 8 and hydroxypropionate 6 have been synthesized.The key porphyrin intermediate 36 in these syntheses was obtai