The field of this invention relates to a novel process, suitable for industrial scale manufacture, for the preparation of 4-(4-aminophenyl)morpholin-3-one of Formula (I), the key intermediate of rivaroxaban according to the scheme. In the process 2-(2-chloroethoxy)ethanol of Formula (XI) is oxidized to 2-(2-chloroethoxy)- acetic acid with aqueous sodium- or calcium-hypochlorite and a catalyst. The 2-(2~ chloroethoxy)acetic acid of Formula (X) is reacted with 4-nitro-aniline of Formula (VII) with phenylboronic acid catalyst. Then the 2-(2-chloroetoxy)-N-(4-nitrophenyl)acetamide of Formula (IX) is transformed to 4-(4-nitrophenyl)morpholin-3-one of Formula (IV) in a „one- pot" procedure. The 4-(4-nitrophenyl)morpholin-3-one of Formula (IV) is hydrogenated to get 4-(4-aminophenyl)morpholin-3-one of Formula (I).
该发明领域涉及一种适用于工业规模生产的新型工艺,用于制备Formula (I)的4-(4-aminophenyl)morpholin-3-one,这是
利伐沙班的关键中间体。在该工艺中,Formula (XI)的2-(2-chloroethoxy)
乙醇被氧化为2-(2-chloroethoxy)-
乙酸,使用含有
氯酸钠或
氯酸钙以及催化剂的
水溶液。然后,Formula (X)的2-(2-chloroetoxy)
乙酸与Formula (VII)的
4-硝基苯胺在苯基
硼酸催化剂的作用下发生反应。接着,Formula (IX)的2-(2-chloroetoxy)-N-(4-nitrophenyl)乙酰胺在“一锅法”过程中转化为Formula (IV)的4-(4-nitrophenyl)morpholin-3-one。最后,Formula (IV)的4-(4-nitrophenyl)morpholin-3-one经氢化得到Formula (I)的4-(4-aminophenyl)morpholin-3-one。