申请人:Zeneca Limited
公开号:US06342630B1
公开(公告)日:2002-01-29
A process for the purification of a compound of general formula I:
wherein:
R1 is hydrogen or C1-C6 alkyl, C2-C6 alkenyl or C2-C6 alkynyl (any of which may optionally be substituted with one or more substituents selected from halogen and OH) or COOR4, COR6, CONR4R5 or CONHSO2R4;
R4 and R5 are each independently hydrogen or C1-C4 alkyl optionally substituted with one or more halogen atoms;
R6 is a halogen atom or a group R4;
R2 is hydrogen or halo;
R3 is C1-C4 alkyl, C2-C4 alkenyl or C2-C4 alkynyl, any of which may optionally be substituted with one or more halogen atoms, or halo; or, where appropriate, a salt thereof;
from a mixture containing the compound of general formula I together with one or more isomers or di-nitrated analogues thereof; the process comprising dissolving the mixture in a suitable crystallisation solvent and recrystallising the product from the resulting crystallisation solution;
characterised in that the crystallisation solution contains not more than 25% loading of the compound of general formula I wherein loading is defined as:
weight
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of
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pure
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compound
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of
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formula
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I
×
100
weight
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of
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pure
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compound
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of
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formula
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I
+
weight
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of
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solvent
and in that the temperature to which the solution is cooled for crystallisation is not greater than about 30° C.
一种通式I化合物的纯化方法,其中:R1为氢或C1-C6烷基,C2-C6烯基或C2-C6炔基(其中任意一个可以选择性地被卤素和OH等取代基取代),或COOR4,COR6,CONR4R5或CONHSO2R4;R4和R5各自独立地为氢或C1-C4烷基,可以选择性地被一个或多个卤素原子取代;R6为卤素原子或R4基团;R2为氢或卤素;R3为C1-C4烷基,C2-C4烯基或C2-C4炔基,其中任意一个可以选择性地被一个或多个卤素原子或卤素取代;或其盐;从含有通式I化合物及其一个或多个异构体或二硝基类似物的混合物中纯化该化合物的方法,包括将混合物溶解在适当的结晶溶剂中,并从所得的结晶溶液中重新结晶产物;其特征在于结晶溶液中不含有超过25%的通式I化合物的负荷,其中负荷定义为:纯通式I化合物重量×100/(纯通式I化合物重量+溶剂重量),并且溶液冷却结晶的温度不大于约30°C。