1-(O3,O5-isopropylidene-O2-methanesulfonyl-β-D-xylofuranosyl)-5-methyl-1H-pyrimidine-2,4-dione 在
sodium hydroxide 作用下,
生成 (4a
R)-2,2,8-trimethyl-(4a
r,5a
c,11a
c,11b
c)-4a,5a,11a,11b-tetrahydro-4
H-[1,3]dioxino[4',5':4,5]furo[2,3-
d]pyrimido[2,1-
b]oxazol-9-one