The hydroxycyclohexanone (7) is readily available via a Robinson annelation, and is converted into the hydroxybutenolide (15) which is incorporated into a synthesis of 6β-hydroxy-3,4-dihydromilbemycin E (28).
羟基
环己酮(7)可通过罗宾逊(Robinson )法容易地获得,并被转化为羟基
丁烯内酯(15),其被并入6β-羟基-3,4-二氢米尔倍霉素E的合成中(28)。