The method of synthesizing vardenafil base, in anhydrous conditions, by chlorosulfonation of 2-(2-etoxy-phenyl)-5-methyl-7-propyl-iH-imidazo[5,1-fJ[1,2,4]triazin-4-one in a mixture of thionyl chloride and sulfurochloridic acid followed by amidation of the product, 4-etoxy-3-(5-methyl-4-oxo-7-propyl-3,4-dihydroimidazo[5,1-f][1,2,4]triazin-2-yl)benzene-sulfonic acid chloride with N-ethylpiperazine, in an aprotic solvent, in the presence of an inorganic base and the method of conversion the product, vardenafil base, to yield vardenafil monohydrochloride trihydrate having a melting point of 234° C. by contacting with water of the anhydrous modification V of vardenafil monohydrochloride in an organic solvent. The subject of the invention is also the anhydrous modification V of vardenafil monohydrochloride and its use in the preparation of vardenafil monohydrochloride trihydrate having a melting point of 234° C.
合成瓦登非尔酮的方法是在无
水条件下,将2-(2-乙氧基苯基)-5-甲基-7-丙基-iH-
咪唑[5,1-fJ
[1,2,4]三嗪-4-酮在
氯化硫酰和
硫酸氯混合物中进行
氯磺化,然后通过产物4-乙氧基-3-(5-甲基-4-氧代-7-丙基-3,4-二氢
咪唑[5,1-f]
[1,2,4]三嗪-2-基)
苯磺酸氯与
N-乙基哌嗪在无极性溶剂中,在
无机碱存在下进行酰胺化来制备。该发明的另一方面是将产物瓦登非尔酮通过在有机溶剂中与瓦登非尔酮单
盐酸一
水合物的无
水V型改性物质接触来得到熔点为234℃的瓦登非尔酮单
盐酸三
水合物的转化方法。该发明的主题还包括瓦登非尔酮单
盐酸的无
水V型改性物质及其在制备熔点为234℃的瓦登非尔酮单
盐酸三
水合物中的应用。