Process and Intermediate Compounds Useful in the Preparation of Statins, Particularly Rosuvastatin
申请人:Moody David John
公开号:US20080281101A1
公开(公告)日:2008-11-13
There is provided a process for the preparation of a compound of formula (7): formula (7) wherein R
1
represents an alkyl group; R
2
represents an aryl group; R
3
represents hydrogen, a protecting group or an alkyl group; and R
4
represents hydrogen, a protecting group or a SO
2
R
5
group where R
5
is an alkyl group, which comprises a) hydroxylating a compound of formula (1): formula (1) wherein Y represents a halo group; P
1
represents hydrogen or a protecting group, and W represents ═O or —OP
2
, in which P
2
represents hydrogen or a protecting group, to give a compound of formula (2): formula (2) b) oxidising the compound of formula (2) to give a compound of formula (3): formula (3) c) coupling the compound of formula (3) with a compound of formula (4): formula (4) wherein R
3
represents a protecting group or an alkyl group; R
4
represents a protecting group or a SO
2
R
5
group where R
5
is an alkyl group; and R
6
represents (PR
7
R
8
)
+
X
−
or P(═O)R
7
R
8
in which X is an anion and R
7
and R
8
each independently is an alkyl, aryl, alkoxy or aryloxy group, to give a compound of formula (5): formula (5) wherein R
3
represents a protecting group or an alkyl group; and R
4
represents a protecting group or a SO
2
R
5
group where R
5
is an alkyl group, d) when W represents —OP
2
, removing any P
2
protecting group and oxidising the compound of formula (5) to give a compound of formula (6): formula (6) and e) subjecting the compound of formula (5) when W represents═O, or compound of formula (6) to ring-opening, removal of any P
1
protecting groups, and optionally removing any additional protecting groups to give a compound of formula (7).
提供了一种制备式(7)化合物的过程:式(7)中R1代表烷基;R2代表芳基;R3代表氢、保护基或烷基;R4代表氢、保护基或SO2R5基,其中R5为烷基。该过程包括:a)对式(1)化合物进行羟基化反应:式(1)中Y代表卤族基;P1代表氢或保护基,W代表═O或—OP2,其中P2代表氢或保护基,得到式(2)化合物:式(2);b)将式(2)化合物进行氧化反应,得到式(3)化合物:式(3);c)将式(3)化合物与式(4)化合物进行偶联反应:式(4)中R3代表保护基或烷基;R4代表保护基或SO2R5基,其中R5为烷基;R6代表(PR7R8)+X−或P(═O)R7R8,其中X为阴离子,R7和R8各自独立地代表烷基、芳基、烷氧基或芳氧基,得到式(5)化合物:式(5)中R3代表保护基或烷基;R4代表保护基或SO2R5基,其中R5为烷基;d)当W代表—OP2时,去除任何P2保护基并将式(5)化合物进行氧化反应,得到式(6)化合物:式(6);e)将式(5)化合物当W代表═O,或将式(6)化合物进行环开启反应,去除任何P1保护基,并可选择性地去除任何其他保护基,得到式(7)化合物。