The enantiomeric prostaglandins, exemplified by ent-PGE(2), are apparently
produced in vivo by the nonenzymatic oxidation of arachidonic acid. To asse
ss the physiological activity of ent-PGE(2), it was necessary to prepare it
by total synthesis. The key transformation in this synthesis was the equil
ibration of the kinetically prepared ent-5-E-2t-isoprostane to ent-PGE(2).
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