申请人:Tian Guanghui
公开号:US20110190495A1
公开(公告)日:2011-08-04
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.
揭示了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(用公式III表示),其制备方法,制备过程中的中间体,这些中间体的制备方法以及从该化合物制备瓦登非尔的方法。在制备瓦登非尔的方法中,氯磺化反应在制备过程的早期阶段进行。