5-[2-ethoxy-5-(1,3-diethoxypropane-1,3-dione-2-acetyl)phenyl]-1-methyl-3-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one 、
邻苯二胺 在
p-toluenesulfonic acid/silica gel 作用下,
反应 0.67h,
以89.4%的产率得到5-[2-ethoxy-5-(1,5-dihydro-3H-1,5-benzodiazepine-2,4-dione-3-acetyl)phenyl]-1-methyl-3-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one