申请人:Beecham Group p.l.c.
公开号:EP0420559A2
公开(公告)日:1991-04-03
A process for the preparation of a compound of formula (A):
wherein X is hydrogen, hydroxy, chloro, C₁₋₆ alkoxy or phenyl C₁₋₆ alkoxy and Ra and Rb are hydrogen, including acyl and phosphate derivatives thereof; which process comprises:
i) the preparation of a compound of formula (I):
wherein R₁ is C₁₋₆ 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, which process comprises the reaction of a compound of formula (II):
with a compound of formula (VII):
wherein Q is a leaving group, J is hydrogen or halo and R₁ is as hereinbefore defined; to give a compound of formula (VIII):
followed by reduction of the compound of formula (VIII) to give a compound of formula (I) as hereinbefore defined; and, as necessary or desired, interconverting variables R₁, R₂ and R₃ to further values of R₁, R₂ and R₃;
(ii) the conversion of the resulting compound of formula (I) to a compound of formula (A) by converting variable R₃, when other than amino, to amino, reducing the ester groups CO₂R₁ to CH₂OH and optionally forming acyl or phosphate derivatives thereof, and as necessary or desired converting variable R₂ in the compound of formula (I) to variable X in the compound of formula (A).
一种制备式(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,包括其酰基和磷酸衍生物;该工艺包括:
i) 制备式 (I) 的化合物:
其中 R₁ 是 C₁₋₆ 烷基,或苯基 C₁₋₆ 烷基,其中苯基任选被取代;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烷基磺酰基、叠氮基、氨基或受保护的氨基:
与式(VII)化合物反应:
其中 Q 为离去基团,J 为氢或卤代,R₁ 如前定义;得到式(VIII)化合物:
然后还原式 (VIII) 化合物,得到如前定义的式 (I) 化合物;并在必要或需要时,将变量 R₁、R₂ 和 R₃ 进一步转化为 R₁、R₂ 和 R₃ 的值;
(ii) 通过将非氨基的变量 R₃ 转化为氨基,将酯基 CO₂R₁ 还原为 CH₂OH,并选择性地形成酰基或磷酸衍生物,以及根据需要将 式(I)化合物中的变量 R₂ 转化为式(A)化合物中的变量 X,将所得式(I)化合物转化为式(A)化合物。