3-氧代丁酸 4-甲氧基苄基酯 、
尿素 、
糠醛 在
4-methoxybenzyl 4-(furan-2-yl)-6-methyl-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 60/40) afforded 27 as an ochre powder (40%)的产率得到4-methoxybenzyl 4-(furan-2-yl)-6-methyl-2-oxo-1,2,3,4-tetrahydropyrimidine-5-carboxylate