糠醛 、
1,3-二甲基脲 、
3-氧代丁酸 4-甲氧基苄基酯 在
4-methoxybenzyl 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 54 as a yellow oil (46%)的产率得到4-methoxybenzyl 4-(furan-2-yl)-1,3,6-trimethyl-2-oxo-1,2,3,4-tetrahydropyrimidine-5-carboxylate