(1S,3S,6S,10R,12R,13R,14S,16R,19R)-5-hydroxy-3,10,12,14,16-pentamethyl-4-methylidene-18,20-dioxatetracyclo[11.5.2.01,6.016,19]icosane-15,17-dione 在
氯化亚砜 、
methyloxirane 作用下,
以
乙醚 为溶剂,
反应 4.0h,
以74%的产率得到(1S,3S,6S,10R,12R,13R,14S,16R,19R)-4-(chloromethyl)-3,10,12,14,16-pentamethyl-18,20-dioxatetracyclo[11.5.2.01,6.016,19]icos-4-ene-15,17-dione