<1β,2α(1R*,2R*),3β,4α,6β>-2-<1-acetamido-2-hydroxypropyl>-3,4-(cyclohexylidenedioxy)-6-hydroxycyclohexanecarboxylic acid, δ-lactone 在
吡啶 、
chromium(VI) oxide 作用下,
以
二氯甲烷 为溶剂,
反应 1.25h,
以72%的产率得到(3α,4α,4aβ,5β,6α)-4-acetamido-5,6-(cyclohexylidenedioxy)-3,4,4a,5,6,7-hexahydro-8-hydroxy-3-methylisocoumarin