The central synthetic segment B for okadaic acid comprises the carbons from 15 through 27 including 6 asymmetric carbons. Its synthesis started from a D-Glucose derivative, whose carbon was extended twice for the six and five membered etherial ring formation. The original conformation of the sugar was inverted when the spiro-ether was formed to eventuate the axial aldehyde formation in 35 overall steps
冈田酸的中央合成链段B包含15至27个碳,其中包括6个不对称碳。它的合成从
D-葡萄糖衍
生物开始,其碳原子两次扩展形成六元和五元醚环。当形成螺醚时,糖的原始构象被颠倒了,最终在35个步骤中最终形成了轴向醛。