4-(Benzenesulfonyl)-5-oxido-1,2,5-oxadiazol-5-ium-3-one 、
2-Hydroxyethyl nortadalafil 在
1,8-二氮杂双环[5.4.0]十一碳-7-烯 作用下,
以45 %的产率得到4-(2-((6R,12aR)-6-(benzo[d][1,3]dioxane-5-yl)-1,4-dioxo-3,4,6,7,12,12a-hexahydropyrazino[1',2':1,6]pyridino[3,4-b]indole-2(1H)-yl)ethoxy)-3-(benzenesulfonyl)-1,2,5-oxadiazole 2-oxide