Disclosed are N-1-[3-(2-ethoxy-5-(4-ethylpiperazinyl)sulfonylphenyl)-4,5-dihydro-5-oxo-1,2,4-triazin-6-yl]ethyl}butyramide (which is represented by formula III), its preparation method, intermediates during preparation procedure, preparation method for such intermediates and a method for preparing vardenafil from the compound. In the method for preparing vardenafil, a chloro-sulfonation reaction carries out in the early stage of the preparation procedure.
本发明公开了 N-1-[3-(2-乙氧基-5-(4-乙基
哌嗪基)磺酰基苯基)-4,
5-二氢-5-氧代-
1,2,4-三嗪-6-基]乙基}丁酰胺(由式 III 表示)、其制备方法、制备过程中的中间体、此类中间体的制备方法以及用该化合物制备
伐地那非的方法。在制备
伐地那非的方法中,
氯磺化反应在制备过程的早期阶段进行。