<4R<4α,5β,6α(1S*,2R*)>>-2-<1-<6-<4-(1,3-dioxolan-2-yl)-1-methyl-2-<(phenylmethoxy)methoxy>butyl>-2,2,5-trimethyl-1,3-dioxan-4-yl>ethyl>-2,3-dihydro-3-methyl-4H-pyran-4-one 在
三氟化硼乙醚 作用下,
以
various solvent(s) 为溶剂,
生成 <4R<4α
>,5β,6α,(1S*,2R*)>>-4-<1-<3,6-dihydro-3-methyl-6-(1-methyl-2-propenyl)-2H-pyran-2-yl>ethyl>-6-<4-(1,3-dioxolan-2-yl)-1-methyl-2-<(phenylmethoxy)methoxy>butyl>-2,2,5-trimethyl-1,3-dioxane