8-bromo-3-methyl-1-(tetrahydro-pyran-2-yl)-1,5-dihydro-pyrazolo[4,3-c]quinolin-4-one 、
4-溴丁酸甲酯 在
potassium carbonate 作用下,
以
DMF (N,N-dimethyl-formamide) 为溶剂,
反应 27.0h,
以57%的产率得到4-[8-bromo-3-methyl-4-oxo-1-(tetrahydro-pyran-2-yl)-1,4-dihydro-pyrazolo[4,3-c]quinolin-5-yl]-butyric acid methyl ester