The present invention is related to a novel process for the preparation of ulipristal (I) that comprises reaction of 17-α-ethynyl-17-β-hydroxy-11-β-(4-N,N-dimethylamino phenyl)- 9-norpregna-4,9-diene-3-one (III) with phenyl sulphenyl chloride (IVa) or p-nitro phenyl sulphenyl chloride (IVb) in the presence of organic base and solvent to give sulfoxide (Va) or (Vb) respectively. Sulfoxides (Va) or (Vb) are reacted with alkali metal alkoxide in alcoholic solvent followed by treatment with aqueous acid. The present invention also relates to novel intermediate 11-β-(4-N,N-dimethylaminophenyl)-21(p- nitro-phenyl-sulphinyl)-19-norpregna-4(5), 9(10), 17(20) 20-tetraene, 3-one (Vb).
本发明涉及一种用于制备尤利普利斯塔尔(I)的新型工艺,该工艺包括将17-α-
乙炔基-17-β-羟基-11-β-(4-N,N-
二甲胺基苯基)-9-诺孕烯-4,9-二烯-3-酮(III)与苯基亚砜
氯化物(IVa)或对
硝基苯基亚砜
氯化物(IVb)在有机碱和溶剂存在下反应,分别得到亚砜氧化物(Va)或(Vb)。亚砜氧化物(Va)或(Vb)与醇性溶剂中的碱
金属烷氧化物反应,随后经过
水酸处理。本发明还涉及新型中间体11-β-(4-N,N-二甲基
氨基苯基)-21(对
硝基苯基亚砜基)-19-诺孕烯-4(5),9(10),17(20) 20-四烯-3-酮(Vb)。