3-[[(3aR,7aS)-2,2,7a-trimethyl-6-oxo-3a,7-dihydro-1,3-benzodioxol-4-yl]methyl]-2-bromo-5-(methoxymethoxy)naphthalene-1,4-dione 在
palladium diacetate 、 silver carbonate 作用下,
以
甲苯 为溶剂,
以66%的产率得到(5S,9R)-20-hydroxy-15-(methoxymethoxy)-5,7,7-trimethyl-6,8-dioxapentacyclo[10.8.0.02,10.05,9.014,19]icosa-1(20),2(10),11,14(19),15,17-hexaene-3,13-dione