methyl N-ethylimidothiocarbamate trifluoroacetate 、
tert-butyl {3-(N,N-dimethylsulfamoyl)-6,8-dioxo-3,5,6,8-tetrahydroimidazo[4,5-g][3,1]benzoxazin-2-yl}methylcarbamate hydrochloride 在
sodium carbonate 作用下,
以
二甲基亚砜 为溶剂,
反应 2.0h,
以25%的产率得到tert-butyl {3-(N,N-dimethylsulfamoyl)-6-(ethylamino)-8-oxo-7,8-dihydro-3H-imidazo[4,5-g]quinazolin-2-yl}methylcarbamate