申请人:BEECHAM GROUP PLC
公开号:EP0302644A2
公开(公告)日:1989-02-08
A process for preparing pharmaceutically active compounds of formula (A):
wherein X is hydrogen, hydroxy, chloro, C1 -6 alkoxy or phenyl C1 -6 alkoxy; and Ra and Rb are hydrogen, or acyl or phosphate derivatives thereof, which process comprises the preparation of an intermediate of formula (I):
wherein R1 is C, -6 alkyl, or phenyl C1-6 alkyl in which the phenyl group is optionally substituted; R2 is hydrogen, hydroxy, chlorine, C1-6 alkoxy, phenyl C1-6 alkoxy or amino; and R3 is halogen, C1-6 alkylthio, C1-6 alkylsulphonyl, azido, an amino group or a protected amino group, via the reaction of a compound of formula (II):
wherein R2 and R3 are as defined for formula (1) with:
(a), a compound of formula (III):
wherein R4 and R5 are independently hydrogen, C1-6 alkyl, or phenyl, or R4 and R5 together are C5-7 cycloalkyl, to give a compound of formula (IV):
or
(b), a compound of formula (V):
一种制备具有药用活性的式(A)化合物的工艺:
其中 X 是氢、羟基、氯、C1 -6 烷氧基或苯基 C1 -6 烷氧基;Ra 和 Rb 是氢、酰基或其磷酸衍生物,该工艺包括制备式 (I) 的中间体:
其中 R1 是 C,-6 烷基或苯基 C1-6烷基,其中苯基是任选取代的;R2 是氢、羟基、氯、C1-6 烷氧基、苯基 C1-6 烷氧基或氨基;R3 是卤素、C1-6 烷硫基、C1-6 烷磺酰基、叠氮基、氨基或受保护的氨基,通过与式 (II) 的化合物反应制备:
其中 R2 和 R3 如式 (1) 所定义,与下列物质反应:
(a) 式 (III) 的化合物:
其中 R4 和 R5 独立地为氢、C1-6 烷基或苯基,或 R4 和 R5 合在一起为 C5-7 环烷基,得到式(IV)化合物:
或
(b) 式 (V) 的化合物: