(5R,8R)-6-[1,3]Dioxolan-2-yl-8-hydroxy-2-(5-hydroxy-2,2-dimethyl-hept-3-ynyl)-3,8-dimethyl-1-oxa-spiro[4.4]nona-2,6-dien-4-one 在
吡啶 、
chromium(VI) oxide 作用下,
以
二氯甲烷 为溶剂,
反应 0.25h,
以68%的产率得到(5R,8R)-2-(2,2-Dimethyl-5-oxo-hept-3-ynyl)-6-[1,3]dioxolan-2-yl-8-hydroxy-3,8-dimethyl-1-oxa-spiro[4.4]nona-2,6-dien-4-one