1-((2R,4aR,6S,7S,8S,8aS)-8-Hydroxy-6-methoxy-2-phenyl-hexahydro-pyrano[3,2-d][1,3]dioxin-7-yl)-5-methyl-1H-pyrimidine-2,4-dione 以60%的产率得到1-((2S,3S,4S,5S,6R)-4,5-Dihydroxy-6-hydroxymethyl-2-methoxy-tetrahydro-pyran-3-yl)-5-methyl-1H-pyrimidine-2,4-dione