5-Exo-phenyl-2, 3-dioxabicyclo [2.2. 1] heptane (4c) was synthesized as a model compound of prostaglandin endoperoxide (PGH) to mimic the bioconversion of PGH into thromboxane (TX). The reaction of (4c) with various electron transfer reagents was investigated. With the aid of a catalytic amount of ferrous ion,(4c) was successfully converted into the thromboxane B (TXB) skeleton.