1,3-dimethyl-2,4-dioxo-7-[(2-tetrahydrofuryl)methyl]-2,3,4,7-tetrahydro-1-pyrrolo[2,3-d]pyrimidine-6-carboxylic acid 在
氯化亚砜 作用下,
以67%的产率得到8-(3-chloropropyl)-1,3-dimethyl-8,9-dihydro-2H-pyrimido[5',4':4,5]pyrrolo[2,1-c][1,4]oxazine-2,4,6(1H,3H)-trione