There is provided a process for the preparation of a compound of formula (7) or salts thereof: wherein R1 represents a hydrogen or a hydrocarbyl group, R2 represents a hydrogen or substituent group, R3 represents a hydrogen or a hydrocarbyl group, and X represents a hydrogen or substituent group which comprises a) cyanating a compound of formula (1): wherein Y represents a halo group, preferably CI or Br; P1 represents hydrogen or a protecting group, and W represents =0 or -OP2, in which P2 represents hydrogen or a protecting group, to give a compound of formula (2): b) reducing the compound of formula (2) to give a compound of formula (3): coupling the compound of formula (3) with a compound of formula (4): to give a compound of formula (5): when W represents -OP2, deprotecting and then oxidising the compound of formula (5) to give a compound of formula (6): and e) subjecting the compound of formula (5) when W represents =O, or compound of formula (6) to ring-opening, and removal of any remaining protecting groups, to give a compound of formula (7) or salts thereof.
提供了一种制备化合物的方法,其
化学式为(7)或其盐:其中R1代表氢或烃基团,R2代表氢或取代基团,R3代表氢或烃基团,X代表氢或取代基团,包括a)
氰化
化学式为(1)的化合物:其中Y代表卤素基团,优选为CI或Br;P1代表氢或保护基团,W代表=0或-
OP2,其中P2代表氢或保护基团,以得到
化学式为(2)的化合物;b)还原
化学式为(2)的化合物以得到
化学式为(3)的化合物;将
化学式为(3)的化合物与
化学式为(4)的化合物偶联以得到
化学式为(5)的化合物;当W代表- 时,去保护然后氧化
化学式为(5)的化合物以得到
化学式为(6)的化合物;和e)将W代表=O时的
化学式为(5)的化合物,或
化学式为(6)的化合物进行环开启和去除任何剩余的保护基团,以得到
化学式为(7)的化合物或其盐。