The present invention provides a novel intermediate, Calcium (3S) tetrahydro - 3 - furanyl (1S,2R)-3- [[(4- nitro -phenyl) - sulfonyl] (isobutyl) amino] - 1 -benzyl - 2 -phosphonooxy) propyl- carbamate (V) and a process for its preparation comprising reacting (3 S) tetrahydro - 3 - furanyl (1S,2R)-3 - [ [ (4 -nitrophenyl) sulfonyl] (isobutyl) amino] - 1 -benzyl - 2 - (hydroxy) propyl carbamate (II) with a phosphorylating agent to obtain (3S) tetrahydro- 3 - furanyl (1S,2R)-3- [[(4- nitrophenyl) sulfonyl] (isobutyl) amino] - 1 -benzyl - 2 - (phosphonooxy) propyl carbamate (III); optionally converting compound (III) to its sodium salt (IV); adding calcium ions to compound (III) or compound (IV); and optionally purifying the resultant compound (V). The present invention also provides a process for the preparation of fosamprenavir calcium comprising reacting a compound (V) with a reducing agent.
                            本发明提供了一种新型中间体,即
钙(3S)四氢-3-
呋喃基(1S,2R)-3-[[(4-硝基-苯基)-磺酰](异丁基)
氨基]-1-苄基-2-
磷酸氧丙基-
氨基甲酸酯(V),以及其制备方法,包括将(3S)四氢-3-
呋喃基(1S,2R)-3-[[(4-
硝基苯基)磺酰](异丁基)
氨基]-1-苄基-2-(羟基)
丙基氨基甲酸酯(II)与
磷酸化剂反应,以获得(3S)四氢-3-
呋喃基(1S,2R)-3-[[(4-
硝基苯基)磺酰](异丁基)
氨基]-1-苄基-2-(
磷酸氧丙基)
氨基甲酸酯(III);可选地将化合物(III)转化为其钠盐(IV);将
钙离子添加到化合物(III)或化合物(IV)中;并可选地纯化所得的化合物(V)。本发明还提供了一种制备福沙匹韦
钙的方法,包括将化合物(V)与还原剂反应。