6-acetoxy-5-oxo-1,5-dihydro-imidazo[1,2-a]pyrimidine-7-carboxylic acid methyl ester 、
2-bromo-1-(3,5-dimethyl-piperidin-1-yl)-ethanone 在
18-冠醚-6 potassium carbonate 作用下,
以
乙腈 为溶剂,
以60.5%的产率得到6-acetoxy-1-[2-(3,5-dimethyl-piperidin-1-yl)-2-oxo-ethyl]-5-oxo-1,5-dihydro-imidazo[1,2-a]pyrimidine-7-carboxylic acid methyl ester