There is provided a process for the preparation of a compound of formula (7) or salts thereof:
wherein R1 represents an alkyl group, R2 represents an aryl group, R3 represents an aryl group, and X represents a group of formula -COZ, wherein Z represents -OR4 or NR5R6 which comprises
a) cyanating a compound of formula (1) to give a compound of formula (2);
b) reducing the compound of formula (2) to give a compound of formula (3);
c) coupling the compound of formula (3) with a compound of formula (4) to give a compound of formula (5);
d) 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,
wherein the process comprises the further step of converting X from -COZ, wherein Z represents -OR4, to -COZ, wherein Z represents NR5R6, by reacting the compounds of formula (4), (5), (6) or (7) with a compound of formula HNR5R6; and/or
wherein the process further comprises forming a compound of formuIa (2) or (3) wherein W represent =O by oxidising a compound of formula (2) or (3) when W represents -OP2 and P2 is hydrogen, or deprotecting and oxidising a compound of formula (2) or (3) when W represents -OP2 and P2 is a protecting group.
本发明提供了一种制备式(7)化合物或其盐类的工艺:
其中 R1 代表烷基,R2 代表芳基,R3 代表芳基,X 代表式-COZ 的基团,其中 Z 代表-OR4 或 NR5R6,该工艺包括
a)
氰化式(1)化合物,得到式(2)化合物;
b) 还原式(2)化合物,得到式(3)化合物
c) 将式(3)化合物与式(4)化合物偶联,得到式(5)化合物;
d) 当 W 代表-
OP2 时,对式(5)化合物进行脱保护,然后氧化,得到式(6)化合物;及
e) 当 W 代表 =O 时,使式 (5) 化合物或式 (6) 化合物开环,去除任何剩余的保护基团,得到式 (7) 化合物或其盐、
其中,该工艺还包括以下步骤:将式 (4)、(5)、(6) 或 (7) 的化合物与式 HNR5R6 的化合物反应,将 X 从 Z 代表-OR4 的-COZ 转化为 Z 代表 NR5R6 的-COZ;和/或
其中该工艺进一步包括当 W 代表- 且 P2 为氢时,通过氧化式 (2) 或 (3) 化合物形成其中 W 代表 =O 的式 (2) 或 (3) 化合物,或当 W 代表- 且 P2 为保护基时,通过脱保护并氧化式 (2) 或 (3) 化合物形成其中 W 代表 =O 的式 (2) 或 (3) 化合物。