反应详情

The title compound was prepared from N-bromosuccinimide (4.9 g, 0.0276 mol) and 3-methyl-6-(2-n-propoxyphenyl)-1-n-propyl-1,5-dihydro-4H-pyrazolo-[3,4-d]pyrimidin-4-one (Example 18; 3.0 g, 0.0092 mol), following the procedure of Example 6, and was obtained as yellow crystals (1.11 g, 30%), m.p. 157-159° C., after crystallisation from ethyl acetate. Found: C,53.14; H,5.17; N,13.76. C18H21BrN4O2 requires C,53.34; H,5.22; N,13.82%.