糠醛 、
1,3-二甲基脲 、 benzo[d][1,3]dioxol-5-ylmethyl 3-oxobutanoate 在
benzo[d][1,3]dioxol-5-ylmethyl 4-(furan-2-yl)-1,3,6-trimethyl-2-oxo-1,2,3,4-tetrahydropyrimidine-5-carboxylate 、 silica gel 作用下,
以Isolation by chromatography on silica gel (cHex/EtOAc=100/0 to 70/30) afforded 61 as a brown oil (70%)的产率得到benzo[d][1,3]dioxol-5-ylmethyl 4-(furan-2-yl)-1,3,6-trimethyl-2-oxo-1,2,3,4-tetrahydropyrimidine-5-carboxylate