糠醛 、 3-methoxybenzyl 3-oxobutanoate 、
尿素 在
3-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 50/50) afforded 55 as an orange solid (70%)的产率得到3-methoxybenzyl 4-(furan-2-yl)-6-methyl-2-oxo-1,2,3,4-tetrahydropyrimidine-5-carboxylate